USRE42175E1 - Electrostatic chucking stage and substrate processing apparatus - Google Patents

Electrostatic chucking stage and substrate processing apparatus Download PDF

Info

Publication number
USRE42175E1
USRE42175E1 US12/470,231 US47023109A USRE42175E US RE42175 E1 USRE42175 E1 US RE42175E1 US 47023109 A US47023109 A US 47023109A US RE42175 E USRE42175 E US RE42175E
Authority
US
United States
Prior art keywords
chucking
layer
dielectric plate
electrode
stage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime, expires
Application number
US12/470,231
Inventor
Yasumi Sago
Kazuaki Kaneko
Takuji Okada
Masayoshi Ikeda
Toshihiro Tachikawa
Tadashi Inokuchi
Takashi Kayamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NHK Spring Co Ltd
Canon Anelva Corp
Original Assignee
NHK Spring Co Ltd
Canon Anelva Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NHK Spring Co Ltd, Canon Anelva Corp filed Critical NHK Spring Co Ltd
Priority to US12/470,231 priority Critical patent/USRE42175E1/en
Application granted granted Critical
Publication of USRE42175E1 publication Critical patent/USRE42175E1/en
Adjusted expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/67Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
    • H01L21/68Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for positioning, orientation or alignment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B11/00Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
    • B25B11/002Magnetic work holders
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00Chucks or sockets
    • Y10T279/23Chucks or sockets with magnetic or electrostatic means

Definitions

  • This invention relates to an electrostatic chucking (ESC) stage for holding a board-shaped object such as a substrate, and a substrate processing apparatus comprising the ESC stage.
  • ESC electrostatic chucking
  • the ESC stages for chucking substrates by electrostatic force are used widely in the field of substrate processing.
  • electronic devices such as LSIs (Large-Scale Integrate circuits) and display devices such as LCDs (Liquid Crystal Displays)
  • ESC stages are used for securing process uniformity and process reproducibility.
  • a substrate is etched, utilizing functions of ions and activated species produced in plasma.
  • an ESC stage is used for holding the substrate at an optimum position against the plasma.
  • an ESC stage comprises a chucking electrode to which voltage for chucking is applied, and a dielectric plate that is polarized by the voltage applied to the chucking electrode.
  • the held substrate is in contact with the dielectric plate, and chucked by static electricity induced on the surface of the dielectric plate.
  • ESC stages are demanded to chuck substrates with making them stable. If a substrate is displaced or changes the posture on an ESC stage while a process is carried out, it might bring the problem of degrading the process uniformity and the process reproducibility.
  • Thermal transformation and thermal expansion of an ESC stage could be critical in substrate processing in view of process homogeneity and process reproducibility. Temperatures of substrates during processes are often higher than room temperature. This is usually from process conditions, otherwise because of environments in process chambers in which processes are carried out. Again, when temperature of a substrate rises up, temperature of the ESC stage rises up as well. If thermal transformation or thermal expansion of the ESC stage takes place from the temperature rise, the held substrate might be transformed or displaced.
  • the invention of this application is to solve the above described subjects, and has the advantage of presenting a high-performance ESC stage capable of preventing transformation and displacement of a held substrate.
  • the invention presents the structure of an ESC stage where a chucking electrode is sandwiched by a moderation layer and a covering layer.
  • the moderation layer and the covering layer have the thermal expansion coefficient between the dielectric plate and the chucking electrode.
  • the invention also presents the structure of another ESC stage where a chucking electrode is sandwiched by a moderation layer and a covering layer, which have internal stress directed oppositely to that of the chucking electrode.
  • This invention also presents a substrate processing apparatus for carrying out a process onto a substrate as the substrate is maintained at a temperature higher than room temperature, comprising an ESC stage for holding the substrate during the process.
  • FIG. 1 is a schematic front cross-sectional view of the ESC stage as the embodiment of the invention.
  • FIG. 2 schematically explains the advantage of the ESC stage shown in FIG. 1 .
  • FIG. 3 is a schematic front cross-sectional view of the substrate processing apparatus as the embodiment of the invention.
  • FIG. 4 , FIG. 5 , FIG. 6 and FIG. 7 schematically show the result of an experiment for confirming the effect obtained from the structure of the embodiment.
  • FIG. 1 is a schematic front cross-sectional view of the ESC stage of the embodiment.
  • the ESC stage comprises a main body 41 , a dielectric plate 42 on which an object 9 is chucked, and a chucking electrode 43 to which voltage for chucking is applied.
  • the ESC stage is table-like as a whole, and holds the board-shaped object 9 on the top surface.
  • the main body 41 is made of metal such as aluminum or stainless-steel.
  • the main body 41 is low column shaped.
  • the chucking electrode 43 is fixed on the main body 41 .
  • the chucking electrode 43 has a flange-shaped part 431 at bottom end. This part 431 is hereinafter called “electrode flange”.
  • the chucking electrode 43 is fixed on the main body 41 at the electrode flange 431 by screwing.
  • the chucking electrode 43 is electrically shorted with the main body 41 .
  • a protection ring 49 is provided, surrounding the screwed electrode flange 431 .
  • the protection ring 49 is made of insulator such as silicon oxide.
  • the protection ring 49 is to protect the side of the chucking electrode 43 and the electrode flange 431 by covering them.
  • the dielectric plate 42 is located at the upside of the chucking electrode 43 .
  • the chucking electrode 43 is formed of an upward convex part and a flange-like part surrounding the convex part.
  • the dielectric plate 42 is almost the same in diameter as the chucking electrode 43 .
  • a chucking power source 40 is connected with the above-described ESC stage.
  • the type of the chucking power source 40 depends on that of the electrostatic chucking.
  • the ESC stage of this embodiment is the mono-electrode type.
  • a positive DC power source is adopted as the chucking power source 40 .
  • the chucking power source 40 is connected with the main body 41 , applying the positive DC voltage to the chucking electrode 43 via the main body 41 .
  • the applied voltage to the chucking electrode 43 causes dielectric polarization, which enables to chuck the object 9 .
  • the positive DC voltage is applied, positive charges are induced on the surface of the dielectric plate 42 , thereby chucking the object 9 electro-statically.
  • Johnson-Rahbeck force is the chucking force generated by convergence of currents at micro-regions.
  • the surfaces of the dielectric plate 42 and the objects 9 are microscopically uneven. Micro-protrusions on the both surfaces contact with each other.
  • the Johnson-Rahbeck force is dominant in such an ESC stage as this embodiment. Still, the present invention is not limited to the one where the Johnson-Rahbeck force is dominant.
  • the ESC stage of this embodiment is supposedly used at a hot temperature environment. This would happen in case, for example, the object 9 is subjected to a test under a hot temperature environment, other than the case that the object 9 is a substrate to be processed, as described later. In the ESC stage of this embodiment, thermal displacement and thermal transformation are prevented even if it is used at a high-temperature environment.
  • a moderation layer 44 is provided between the dielectric plate 42 and the chucking electrode 43 .
  • the moderation layer 44 moderates difference of the thermal expansion coefficients between the dielectric plate 42 and the chucking electrode 43 so that thermal displacement and thermal transformation of the object 9 can be prevented. More concretely, the moderation layer 44 has an intermediate value of the thermal expansion coefficient between that of the dielectric plate 42 and that of the chucking electrode 43 .
  • “Intermediate value of the thermal expansion coefficient” just means: if the thermal expansion coefficient of the chucking electrode 43 is higher than the dielectric plate 42 , then it is lower than the chucking electrode 43 and higher than the dielectric plate 42 ; and if the thermal expansion coefficient of the dielectric plate 42 is higher than the chucking electrode 43 , then it is lower than the dielectric plate 42 and higher than the chucking electrode 43 .
  • the chucking electrode 43 is made of aluminum
  • the dielectric plate 42 is made of magnesia (MgO).
  • the moderation layer 44 is made of composite of ceramic and metal.
  • composite having the thermal expansion coefficient between aluminum and magnesia we can name composite of silicon carbide and aluminum, which hereinafter called “SiC—Al composite”.
  • the thermal expansion coefficient of aluminum is 0.237 ⁇ 10 ⁇ 4 /K
  • that of magnesia is 14 ⁇ 10 ⁇ 6 /K.
  • the SiC—Al composite having the thermal expansion coefficient of about 10 ⁇ 10 ⁇ 6 /K is preferably chosen as material of the moderation layer 44 .
  • This kind of SiC—Al composite is manufactured by poring melting aluminum into porous SiC bulk and fill out it.
  • the porous SiC bulk is prepared by the hot-temperature high-pressure sinter-molding of SiC powder. After cooling pored aluminum, the moderation layer 44 shaped as in Fin. 1 is obtained by such machine work as cutting.
  • the volume opening ratio of the porous SiC—Al bulk is adjusted by choosing an adequate temperature and an adequate pressure in the sinter-molding, which enables to adjust the volume of filled aluminum.
  • the volume opening ratio is obtained by comparing density of the porous bulk with that of a non-porous one of the same size.
  • the thermal expansion coefficient of the SiC—Al composite manufactured in the described manner depends on the component ratio of aluminum against SiC.
  • the described thermal expansion coefficient of 10 ⁇ 10 ⁇ 6 /K is obtained by adjusting the component ratio.
  • a covering layer 45 is provided on the chucking electrode 43 at the opposite side to the moderation layer 44 .
  • the ESC stage has the structure where the chucking electrode 43 is sandwiched by the moderation layer 44 and the covering layer 45 .
  • the covering layer 45 is inserted between the chucking electrode 43 and the main body 41 .
  • This covering layer 45 is also made of material of which thermal expansion coefficient is between the dielectric plate 42 and the chucking electrode 43 . This is enabled by adopting the same material as of the moderation layer 44 . Still, different material may be adopted for the covering layer 45 .
  • FIG. 2 schematically explains the advantage of the ESC stage shown in FIG. 1 .
  • the dielectric plate 42 there is large difference of the thermal expansion coefficients between material of the chucking electrode, i.e. metal, and material of the dielectric plate 42 , i.e. dielectric.
  • material of the chucking electrode i.e. metal
  • material of the dielectric plate 42 i.e. dielectric.
  • the dielectric plate 42 would be also transformed to be convex as shown in FIG. 2 ( 1 ), or to be concave as shown in FIG. 2 ( 2 ). Such a transformation of the dielectric plate 42 would bring displacement or transformation of the object 9 being chucked.
  • thermal stress within the moderation layer 44 and the covering layer 45 would function so as to restrain the transformation of the chucking electrode 43 .
  • thermal stress of the moderation layer 44 and the covering layer 45 could function so as to transform it in the opposite way, i.e. making it convex downward.
  • compression stress could be produced within the moderation layer 44 and the covering layer 45 when tensile stress is produced within the chucking electrode 43 .
  • the moderation layer 44 and the covering layer 45 could have stress opposite against stress within the chucking electrode 43 .
  • “Opposite” in this does not always mean that stress is directed completely to an opposite direction. Expressing by vectors, vectors of stress within the moderation layer 44 and the covering layer 45 make an angle over 90 degrees against the vector of stress within the chucking layer 43 .
  • the covering layer 45 further restrains transformation of the chucking electrode 43 and the consequent transformation of the dielectric plate 42 .
  • displacement and transformation of the object 9 can be restrained as well.
  • the point that the covering layer 45 has a similar thermal-expansion-coefficient does not means complete correspondence of the thermal expansion coefficient, but just means that the covering layer 45 is similar to the moderation layer 44 in view of having the in-between thermal-expansion-coefficient.
  • the same ceramic-metal composite as of the moderation layer 44 e.g. SiC-Al composite, may be employed as material of the covering layer 45 .
  • the composite for the covering layer 45 is conductive, having sufficient metal content. This is not to insulate the chucking electrode 43 from the main body 41 .
  • the dielectric plate 42 is in junction with the chucking electrode 43 by such brazing material as one of which main component is aluminum or indium.
  • Main component here implies pure aluminum or pure indium, in addition to one including some additive.
  • the junction is performed by whole-surface brazing. Concretely, a thin sheet made of aluminum or indium is inserted between the dielectric plate 42 and the moderation layer 44 .
  • the dielectric plate 42 is fixed with the moderation layer 44 .
  • pressure ranging from 1 MPa to 2 MPa is mechanically applied with the heating at a temperature ranging from 570° C. to 590° C., in view of enhancing the thermal contact and the mechanical strength.
  • Such the junction by brazing restrains transformation of the dielectric plate 42 further effectively.
  • the dielectric plate 42 and the moderation layer 44 may be soldered by solder of which main component is tin or lead.
  • the apparatus of the present invention is to process a substrate, maintaining it at a temperature higher than room temperature.
  • a plasma etching apparatus is adopted as an example of substrate processing apparatuses.
  • object is replaced with “substrate” that is the sub-concept of it.
  • FIG. 3 is a schematic front cross-sectional view of the substrate processing apparatus as the embodiment of the invention.
  • the apparatus shown in FIG. 3 comprises a process chamber in which plasma etching is carried out onto the substrate 9 , a process-gas introduction line 2 to introduce a process gas into the process chamber 1 , a plasma generator 3 to generate plasma in the process chamber 1 by applying energy to the introduced process gas, and an ESC stage 4 to hold the substrate 9 by chucking it electro-statically at a position where the substrate 9 can be etched by a function of the plasma.
  • the ESC stage 4 is almost the same as the described embodiment.
  • the process chamber is the air-tight vacuum vessel, which is pumped by a pumping line 11 .
  • the process chamber 1 is made of metal such as stain-less steel and electrically grounded.
  • the pumping line 11 comprises a vacuum pump 111 such as dry pump and a pumping speed controller 112 , thereby being capable of maintaining pressure in the process chamber 1 at 10 ⁇ 3 Pa to 10 Pa.
  • the process-gas introduction line 2 is capable of introducing the process gas for the plasma etching at a required flow-rate.
  • a reactive gas as CHF3 is introduced into the process chamber 1 as the process gas.
  • the process-gas introduction line 2 comprises a gas bomb filled with the process gas, and a feeding pipe interconnecting the gas bomb and the process chamber 1 .
  • the plasma generator 3 generates the plasma by applying radio-frequency (RF) energy to the introduced process gas.
  • the plasma generator 3 comprises an opposed electrode 30 facing to the ESC stage 4 , and an RF power source 31 to apply RF voltage to the opposed electrode 30 .
  • the RF power source 31 is hereinafter called “plasma-generation source”. Frequency of the plasma-generation source 31 ranges from 100 kHz to several tens MHz.
  • the plasma-generation source 31 is connected with the opposed electrode 30 interposing a matching circuit (not shown). Output of the plasma-generation source 31 may range from 300 W to 2500 W.
  • the opposed electrode 30 is installed air-tightly with the process chamber 1 , inserting an insulator 32 .
  • the plasma-generation source 31 applies the RF voltage to the opposed electrode 30 , an RF discharge is ignited with the introduced process gas by RF field provided in the process chamber 1 . Through the discharge, the process gas transits to the state of plasma.
  • the process gas is fluoride
  • ions and activated species of fluorine or fluoride are profusely produced in the plasma. Those ions and species reach the substrate 9 , thereby etching the surface of the substrate 9 .
  • Another RF power source 6 is connected with the ESC stage 4 , interposing a capacitor. This RF power source 6 is to make ions incident onto the substrate 9 efficiently.
  • This RF power source 6 is hereinafter called “ion-incidence source”.
  • ion-incidence source When the ion-incidence source 6 is operated in the state the plasma is generated, self-biasing voltage is provided to the substrate 9 .
  • the self biasing voltage is negative DC voltage that is generated through the mutual reaction of the plasma and the RF wave.
  • the self-biasing voltage makes ions incident onto the substrate 9 efficiently, thereby enhancing the etching rate.
  • a correction ring 46 is provided with the ESC stage 4 .
  • the correction ring 46 is installed on the flange part of the dielectric plate 42 , being flush with the substrate 9 .
  • the correction ring 46 is made of the same or similar material as the substrate 9 , e.g. silicon mono-crystal.
  • the correction ring 46 is to prevent non-uniformity or non-homogeneity of the process at the periphery on the substrate 9 . Temperature on the substrate 9 tends to be lower at the periphery in comparison with the center, because of heat dissipation from the edge of the substrate 9 .
  • the correction ring 46 made of the same or similar material as the substrate 9 is provided surrounding the substrate 9 to compensate the heat dissociation.
  • the plasma is sustained by ions and electrons released from the substrate 9 during the etching as well.
  • the plasma density tends to be lower at the space facing to the periphery of the substrate 9 , because a less number of ions and electrons are released, compared to the center.
  • the correction ring 46 made of the same or similar material as the substrate 9 is provided surrounding it, amount of ions and electros supplied to the space facing the periphery of the substrate 9 is increased, thereby making the plasma more uniform and more homogeneous.
  • the ESC stage 4 comprises the protection ring 49 .
  • the protection ring 49 protects the side of the chucking electrode 43 and the electrode flange from the damage by the plasma or discharge.
  • the silicon-oxide-made protection ring 49 reduces probability to contaminate the substrate 9 even if it is etched.
  • the ESC stage 4 is installed with the process chamber 1 , inserting an insulator 47 .
  • the insulator 47 is made of material such as alumina, insulating the main body 41 from the process chamber 1 as well as protecting the main body 41 from the plasma.
  • vacuum seals such as O-rings are provided between the ESC stage 4 and the insulator 47 , and between the process chamber 1 and the insulator 47 .
  • the apparatus of this embodiment comprises a temperature controller 5 for controlling temperature of the substrate 9 during the process.
  • temperature of a substrate to be kept during a process which is hereinafter called “optimum temperature”, is often higher than room temperature.
  • optimum temperature is often higher than room temperature.
  • temperature of the substrate 9 easily exceeds the optimum temperature by receiving heat from the plasma.
  • the temperature controller 5 cools the substrate 9 and controls temperature of it at the optimum value during the etching.
  • the chucking electrode 43 has a cavity in itself.
  • the temperature controller 5 circulates coolant through the cavity to cool the chucking electrode 43 , thereby cooling the substrate 9 indirectly.
  • the cavity preferably has a complex configuration so that area for heat exchange by the coolant can be enlarged.
  • a cavity having complex uneven walls is formed by making a couple of cooling fin-plates face to each other with each fin staggered.
  • the temperature controller 51 comprises a coolant feeding pipe 51 to feed the coolant into the cavity, a coolant drainage pipe 52 to drain the coolant out of the cavity, and a circulator 53 to circulate the coolant controlled at a required low temperature.
  • the coolant Fluorinate (trademark of 3M Corporation) is employed, for example.
  • the temperature controller 51 cools the substrate 9 at a temperature ranging from 80° C. to 90° C. by circulating the coolant of 30° C. to 40° C.
  • the substrate processing apparatus comprises a heat-transfer gas introduction line (not shown) to introduce a gas between the chucked substrate 9 and the dielectric plate 42 .
  • the heat-transfer gas introduction is to enhance heat transfer efficiency between the chucked substrate 9 and the dielectric plate 42 .
  • the back surface of the substrate 9 and the top surface of the dielectric plate 42 are not completely planar, but rough microscopically. Heat transfer efficiency is poor at spaces formed of the micro roughness on the surfaces, because those are at a vacuum pressure.
  • the heat-transfer gas introduction line introduces a gas of high thermal conductivity, e.g. helium, into the spaces, thereby improving heat transfer efficiency.
  • the ESC stage 4 comprises lift pins 48 in the inside for accepting and releasing the substrate 9 .
  • the lift pins 48 are elevated by an elevation mechanism (not shown). Though only one lift pin 48 appears in FIG. 3 , three lift pins 48 are provided actually.
  • the substrate processing apparatus After a transfer mechanism (not shown) transfers the substrate 9 into the process chamber 1 , the substrate 9 is placed on the ESC stage 4 by operation of the lift pins 48 . With operation of the chucking power source 40 , the substrate 9 is chucked on the ESC stage 4 .
  • the process chamber 1 has been pumped at a required vacuum pressure in advance.
  • the process-gas introduction line 2 is operated to introduce the process gas at a required flow-rate.
  • the plasma-generation source 31 is operated, thereby generating the plasma.
  • the etching is performed utilizing the plasma as described.
  • the temperature controller 5 cools the substrate 9 at an optimum temperature.
  • the ion-incidence source 6 is operated for enhancing the etching efficiency. After performing the etching for a required period, operations of the process-gas introduction line 2 , the plasma-generation source 31 , and the ion-incidence source 6 are stopped. Then, operation of the chucking power source 40 is stopped, dissolving the chucking of the substrate 9 . After the process chamber 1 is pumped again, the substrate 9 is transferred out of the process chamber 1 by the transfer mechanism.
  • the chucking electrode 43 is heated higher than room temperature, its transformation is restrained by the moderation layer 44 and the covering layer as described. Therefore, transformation of the dielectric plate 42 , and displacement or transformation of the substrate 9 caused thereby are restrained as well, Accordingly, the process uniformity and the process homogeneity are enhanced.
  • the advantage of the moderation layer 44 and the covering layer 45 to restrain the transformation is greatly remarkable in the structure where the correction ring 46 is provided.
  • the correction ring 46 has the configuration essentially equivalent to extending the substrate 9 outward. Material of the correction ring 46 is the same as or similar to the substrate 9 .
  • the correction ring 46 is provided on the flange part of the dielectric plate 42 , and chucked on it as well as the substrate 9 . Probability and volume of transformation of the dielectric plate 42 would be greater at the flange part comparatively, because the flange part is thin and peripheral.
  • the correction ring 46 is hard to be transformed or displaced, because transformation and displacement of the dielectric plate 42 are restrained by suppressing transformation of the chucking electrode 43 . Therefore, this embodiment is free from such the problems as non-uniformity and non-reproducibility of the substrate temperature.
  • FIGS. 4 to 7 schematically show the result of this experiment.
  • transformation and displacement of the surface of the dielectric plate 42 were measured under conditions of different temperatures or different temperature histories on the ESC stages. The transformation and the displacement are measured by a distance meter. Setting a reference level above the ESC stage, distance from each point on the surface of the dielectric plate 42 to the reference level is measured by the distance meter for detecting height of each point.
  • FIG. 4 and FIG. 5 both show heights of points on the surface of the convex part of the dielectric plate 42 .
  • FIG. 4 shows the heights in case of the prior-art ESC stage without the moderation layer 44 and the covering layer 45 .
  • FIG. 5 shows the heights in case of the ESC stage of the described embodiment with the moderation layer 44 and the covering layer 45 .
  • FIG. 6 and FIG. 7 both show heights of points on the surface of the flange part of the dielectric plate 42 .
  • FIG. 6 shows the heights in case of the prior-art ESC stage without the moderation layer 44 and the covering layer 45 .
  • FIG. 7 shows the heights in case of the ESC stage of the described embodiment with the moderation layer 44 and the covering layer 45 .
  • FIG. 1 Location of each point on the flange part designated by ⁇ circle around (1) ⁇ , ⁇ circle around (2) ⁇ , ⁇ circle around (3) ⁇ , ⁇ circle around (4) ⁇ in FIG. 6 and FIG. 7 is shown in FIG. 1 by the same ⁇ circle around (1) ⁇ , ⁇ circle around (2) ⁇ , ⁇ circle around (3) ⁇ , ⁇ circle around (4) ⁇ respectively.
  • stage temperature Temperature of an ESO stage is hereinafter called “stage temperature”.
  • A designates data measured at the stage temperature of 20° C. after leaving the ESC stage at 20° C. for all night long.
  • B designates data measured, keeping the stage temperature at 5° C.
  • C designates data measured at the stage temperature of 20° C. after cooling the ESC stage at 5° C.
  • D designates data measured, keeping the stage temperature at 50° C.
  • E designates data measured, forcedly cooling the ESC stage at 20° C. after making the stage temperature 50° C.
  • the ESC stage 4 comprises openings for interior members such as the lift pins 48 , data at those openings are omitted in FIGS. 4 to 7 .
  • level of the dielectric plate 42 is higher when the stage temperature is higher. This results from thermal expansion of the whole ESC stage 4 , being natural in a sense. What is the problem is that displacement or transformation of the dielectric plate 42 depends on values of the stage temperature or histories of the stage temperature.
  • each line appearing in FIG. 5 is drawn through points on the surface of the dielectric plate 42 , which is hereinafter called “surface level distribution”.
  • the surface level distribution is elevated up and down, depending on the stage temperature or the history of the stage temperature, as it keeps the same figure. In short, it is displaced in parallel. This supposedly demonstrates the dielectric plate 42 has not been transformed and has performed the uniform thermal expansion.
  • the surface level distribution is elevated up and down as it changes the figure, depending on the stage temperature or the history of the stage temperature. In short, it is not displaced in parallel. This supposedly demonstrates transformation of the dielectric plate 42 has taken place.
  • the same analysis is applicable to the result at the flange part.
  • the surface level distribution is elevated up and down, keeping the same figure.
  • the surface level distribution is elevated, changing the figure. Also at each different history of the stage temperature, the surface level distribution draws a different curve in FIG. 7 .
  • a temperature history that the ESC stage has submitted while the by-piece processes are continuingly carried out differs from another temperature history of the ESC stage that is initially used for the process of the first substrate.
  • Such a situation happens, for example, when operation of the apparatus is resumed after suspension for the maintenance.
  • the surface level distribution depends on the history of the stage temperature means that the substrate 9 would be transformed or displaced depending on the history, even if the ESC stage 4 is controlled at a constant temperature by the temperature controller 5 . This could be the serious problem with respect to the process reproducibility.
  • the moderation layer 44 and the covering layer 45 are provided, however, the surface level distribution does not depend on the history of the stage temperature, with no transformation and no displacement of the substrate 9 . Therefore, processes with high reproducibility are enabled only by maintaining the ESC stage 4 at a required temperature.
  • SiC—Cu composite means composite” made of silicon carbide and cupper. Manufacture of this composite may be the same process as of the described SiC—Al composite. Magnesia is superior to alumina in erosion resistance. In case an erosive gas is used as in the etching, the dielectric plate 42 made of magnesia is more preferable. Size of the substrate 9 chucked by any one of the examples is, for example, 300 mm diameter.
  • Material of the moderation layer 44 and the covering layer 45 is not limited to described SiC—Al composite or SiC—Cu composite. It may be another composite of ceramic and metal. For instance, it may be composite of silicon carbide and nickel, composite of silicon carbide and Fe—Ni—Co alloy, composite of silicon carbide and Fe—Ni alloy, composite of silicon nitride (Si 3 N 4 ) and nickel, or composite of silicon nitride and Fe—Ni alloy. Moreover, material of moderation layer 44 and the covering layer 45 is not limited to composite of ceramic and metal. What is required is only that it has the thermal expansion coefficient between the chucking electrode 43 and the dielectric plate 42 .
  • the bi-electrode type comprises a couple of chucking electrodes, to which voltages of opposite polarity to each other are applied.
  • the multi-electrode type comprises multiple couples of chucking electrodes, applying voltages of opposite polarity to each electrode of each couple. In these types, the chucking electrodes may be buried within the dielectric plate 42 . In case of the mono-electrode type, negative DC voltage may be applied for chucking.
  • the present invention is also enabled in these types.
  • the described ESC stage chucks the object or substrate 9 on the top surface, it may be overturned, i.e. chucking the object or substrate 9 at the bottom surface. Moreover, the ESC stage may chuck the object or substrate 9 on the side surface, making it uprightly.
  • the plasma etching apparatus was adopted as the example of substrate processing apparatuses in the above description, the present invention is enabled for other apparatuses such as plasma chemical vapor deposition (CVD) apparatuses and sputtering apparatuses.
  • the temperature controller 5 may heat the substrate 9 and maintain it at a required temperature.

Abstract

This application discloses the structure of an ESC stage where a chucking electrode is sandwiched by a moderation layer and a covering layer. The moderation layer and the covering layer have the thermal expansion coefficients between the dielectric plate and the chucking electrode. This application also discloses the structure of an ESC stage where a chucking electrode is sandwiched by a moderation layer and a covering layer, which have internal stress directed oppositely to that of the chucking electrode. This application further discloses a substrate processing apparatus for carrying out a process onto a substrate as the substrate is maintained at a temperature higher than room temperature, comprising the electrostatic chucking stage for holding the substrate during the process.

Description

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an electrostatic chucking (ESC) stage for holding a board-shaped object such as a substrate, and a substrate processing apparatus comprising the ESC stage.
2. Description of the Related Art
The ESC stages for chucking substrates by electrostatic force are used widely in the field of substrate processing. In manufacturing electronic devices such as LSIs (Large-Scale Integrate circuits) and display devices such as LCDs (Liquid Crystal Displays), for example, there are many steps of processing substrates that are bases for products. In these steps, ESC stages are used for securing process uniformity and process reproducibility. Taking the plasma etching as an example, a substrate is etched, utilizing functions of ions and activated species produced in plasma. In this, an ESC stage is used for holding the substrate at an optimum position against the plasma.
Generally, an ESC stage comprises a chucking electrode to which voltage for chucking is applied, and a dielectric plate that is polarized by the voltage applied to the chucking electrode. The held substrate is in contact with the dielectric plate, and chucked by static electricity induced on the surface of the dielectric plate.
ESC stages are demanded to chuck substrates with making them stable. If a substrate is displaced or changes the posture on an ESC stage while a process is carried out, it might bring the problem of degrading the process uniformity and the process reproducibility. Thermal transformation and thermal expansion of an ESC stage could be critical in substrate processing in view of process homogeneity and process reproducibility. Temperatures of substrates during processes are often higher than room temperature. This is usually from process conditions, otherwise because of environments in process chambers in which processes are carried out. Anyway, when temperature of a substrate rises up, temperature of the ESC stage rises up as well. If thermal transformation or thermal expansion of the ESC stage takes place from the temperature rise, the held substrate might be transformed or displaced.
SUMMARY OF THE INVENTION
The invention of this application is to solve the above described subjects, and has the advantage of presenting a high-performance ESC stage capable of preventing transformation and displacement of a held substrate. Concretely, the invention presents the structure of an ESC stage where a chucking electrode is sandwiched by a moderation layer and a covering layer. The moderation layer and the covering layer have the thermal expansion coefficient between the dielectric plate and the chucking electrode. The invention also presents the structure of another ESC stage where a chucking electrode is sandwiched by a moderation layer and a covering layer, which have internal stress directed oppositely to that of the chucking electrode. This invention also presents a substrate processing apparatus for carrying out a process onto a substrate as the substrate is maintained at a temperature higher than room temperature, comprising an ESC stage for holding the substrate during the process.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a schematic front cross-sectional view of the ESC stage as the embodiment of the invention.
FIG. 2 schematically explains the advantage of the ESC stage shown in FIG. 1.
FIG. 3 is a schematic front cross-sectional view of the substrate processing apparatus as the embodiment of the invention.
FIG. 4, FIG. 5, FIG. 6 and FIG. 7 schematically show the result of an experiment for confirming the effect obtained from the structure of the embodiment.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The preferred embodiments of this invention will be described as follows. First, the ESC stage of the embodiment will be described. FIG. 1 is a schematic front cross-sectional view of the ESC stage of the embodiment. The ESC stage comprises a main body 41, a dielectric plate 42 on which an object 9 is chucked, and a chucking electrode 43 to which voltage for chucking is applied.
The ESC stage is table-like as a whole, and holds the board-shaped object 9 on the top surface. The main body 41 is made of metal such as aluminum or stainless-steel. The main body 41 is low column shaped. The chucking electrode 43 is fixed on the main body 41. As shown in FIG. 1, the chucking electrode 43 has a flange-shaped part 431 at bottom end. This part 431 is hereinafter called “electrode flange”. The chucking electrode 43 is fixed on the main body 41 at the electrode flange 431 by screwing. The chucking electrode 43 is electrically shorted with the main body 41.
A protection ring 49 is provided, surrounding the screwed electrode flange 431. The protection ring 49 is made of insulator such as silicon oxide. The protection ring 49 is to protect the side of the chucking electrode 43 and the electrode flange 431 by covering them.
The dielectric plate 42 is located at the upside of the chucking electrode 43. As shown in FIG. 1, the chucking electrode 43 is formed of an upward convex part and a flange-like part surrounding the convex part. The dielectric plate 42 is almost the same in diameter as the chucking electrode 43.
A chucking power source 40 is connected with the above-described ESC stage. The type of the chucking power source 40 depends on that of the electrostatic chucking. The ESC stage of this embodiment is the mono-electrode type. A positive DC power source is adopted as the chucking power source 40. The chucking power source 40 is connected with the main body 41, applying the positive DC voltage to the chucking electrode 43 via the main body 41. The applied voltage to the chucking electrode 43 causes dielectric polarization, which enables to chuck the object 9. In this embodiment, because the positive DC voltage is applied, positive charges are induced on the surface of the dielectric plate 42, thereby chucking the object 9 electro-statically.
Two mechanisms of the electro-static chucking have been known. One is by Coulomb force, and the other one is by Johnson-Rahbeck force. Johnson-Rahbeck force is the chucking force generated by convergence of currents at micro-regions. The surfaces of the dielectric plate 42 and the objects 9 are microscopically uneven. Micro-protrusions on the both surfaces contact with each other. When the electrostatic charges are induced by the chucking power source 40, the flowing currents converge at the protrusions contacting with each other, thereby generating the Johnson-Rahbeck force. The Johnson-Rahbeck force is dominant in such an ESC stage as this embodiment. Still, the present invention is not limited to the one where the Johnson-Rahbeck force is dominant.
One of points greatly characterizing the ESC stage of this embodiment is in the structure where thermal displacement and thermal transformation of the object 9 are effectively prevented. This point will be described as follows. The ESC stage of this embodiment is supposedly used at a hot temperature environment. This would happen in case, for example, the object 9 is subjected to a test under a hot temperature environment, other than the case that the object 9 is a substrate to be processed, as described later. In the ESC stage of this embodiment, thermal displacement and thermal transformation are prevented even if it is used at a high-temperature environment.
Concretely, as shown in FIG. 1, a moderation layer 44 is provided between the dielectric plate 42 and the chucking electrode 43. The moderation layer 44 moderates difference of the thermal expansion coefficients between the dielectric plate 42 and the chucking electrode 43 so that thermal displacement and thermal transformation of the object 9 can be prevented. More concretely, the moderation layer 44 has an intermediate value of the thermal expansion coefficient between that of the dielectric plate 42 and that of the chucking electrode 43. “Intermediate value of the thermal expansion coefficient” just means: if the thermal expansion coefficient of the chucking electrode 43 is higher than the dielectric plate 42, then it is lower than the chucking electrode 43 and higher than the dielectric plate 42; and if the thermal expansion coefficient of the dielectric plate 42 is higher than the chucking electrode 43, then it is lower than the dielectric plate 42 and higher than the chucking electrode 43.
In this embodiment, specifically, the chucking electrode 43 is made of aluminum, and the dielectric plate 42 is made of magnesia (MgO). The moderation layer 44 is made of composite of ceramic and metal. As composite having the thermal expansion coefficient between aluminum and magnesia, we can name composite of silicon carbide and aluminum, which hereinafter called “SiC—Al composite”. The thermal expansion coefficient of aluminum is 0.237×10−4/K, and that of magnesia is 14×10−6/K. In this case, the SiC—Al composite having the thermal expansion coefficient of about 10×10−6/K is preferably chosen as material of the moderation layer 44. This kind of SiC—Al composite is manufactured by poring melting aluminum into porous SiC bulk and fill out it. The porous SiC bulk is prepared by the hot-temperature high-pressure sinter-molding of SiC powder. After cooling pored aluminum, the moderation layer 44 shaped as in Fin. 1 is obtained by such machine work as cutting. The volume opening ratio of the porous SiC—Al bulk is adjusted by choosing an adequate temperature and an adequate pressure in the sinter-molding, which enables to adjust the volume of filled aluminum. The volume opening ratio is obtained by comparing density of the porous bulk with that of a non-porous one of the same size. The thermal expansion coefficient of the SiC—Al composite manufactured in the described manner depends on the component ratio of aluminum against SiC. The described thermal expansion coefficient of 10×10−6/K is obtained by adjusting the component ratio.
In addition in the ESC stage of this embodiment, a covering layer 45 is provided on the chucking electrode 43 at the opposite side to the moderation layer 44. In other words, the ESC stage has the structure where the chucking electrode 43 is sandwiched by the moderation layer 44 and the covering layer 45. The covering layer 45 is inserted between the chucking electrode 43 and the main body 41. This covering layer 45 is also made of material of which thermal expansion coefficient is between the dielectric plate 42 and the chucking electrode 43. This is enabled by adopting the same material as of the moderation layer 44. Still, different material may be adopted for the covering layer 45.
The structure where the chucking electrode 43 is sandwiched by the moderation layer 44 and the covering layer 45 having the in-between thermal-expansion-coefficient enables to prevent displacement and transformation of the chucked objected 9. This point will be described in detail as follows, referring FIG. 2. FIG. 2 schematically explains the advantage of the ESC stage shown in FIG. 1.
Generally, there is large difference of the thermal expansion coefficients between material of the chucking electrode, i.e. metal, and material of the dielectric plate 42, i.e. dielectric. In the prior-art structure where the dielectric plate 42 is fixed on the chucking electrode 43, when the ESC stage is heated up to a hot temperature, large transformation of the chucking electrode 43 would take place easily from its thermal expansion difference from the dielectric plate 42. As a result, the dielectric plate 42 would be also transformed to be convex as shown in FIG. 2(1), or to be concave as shown in FIG. 2(2). Such a transformation of the dielectric plate 42 would bring displacement or transformation of the object 9 being chucked.
In the prior-art structure where the moderation layer 44 having the in-between thermal-expansion-coefficient is inserted between the dielectric plate 42 and the chucking electrode 43, the difference of the thermal expansion coefficients is moderated, thereby suppressing transformation of the dielectric plate 42. From the research by the inventors, it has turned out that transformation of the dielectric plate 42 is further suppressed when a layer similar to the moderation layer 44 is provided at the opposite side in addition, as shown in FIG. 2(4). Though the reason of this has not been clarified completely, it is considered that thermal expansion at the both sides of the chucking electrode 43 would be in a balanced state when it is sandwiched by the layers having the in-between thermal-expansion-coefficients. It is further considered that internal-stress of the chucking electrode 43 would be balanced by the both-sides layers having the similar thermal expansion coefficients.
Respecting to thermal stress, it also could be considered that thermal stress within the moderation layer 44 and the covering layer 45 would function so as to restrain the transformation of the chucking electrode 43. For example, when the chucking electrode 43 would be transformed to be convex upward, internal thermal stress of the moderation layer 44 and the covering layer 45 could function so as to transform it in the opposite way, i.e. making it convex downward. In addition, it could take place that when compression stress is produced within the chucking electrode 43, tensile stress is produced within the moderation layer 44 and the covering layer 45. Inversely, compression stress could be produced within the moderation layer 44 and the covering layer 45 when tensile stress is produced within the chucking electrode 43. Generally, it can be expressed that the moderation layer 44 and the covering layer 45 could have stress opposite against stress within the chucking electrode 43. “Opposite” in this does not always mean that stress is directed completely to an opposite direction. Expressing by vectors, vectors of stress within the moderation layer 44 and the covering layer 45 make an angle over 90 degrees against the vector of stress within the chucking layer 43.
Anyway, provision of the covering layer 45 further restrains transformation of the chucking electrode 43 and the consequent transformation of the dielectric plate 42. As a result, displacement and transformation of the object 9 can be restrained as well. The point that the covering layer 45 has a similar thermal-expansion-coefficient does not means complete correspondence of the thermal expansion coefficient, but just means that the covering layer 45 is similar to the moderation layer 44 in view of having the in-between thermal-expansion-coefficient. Although, the same ceramic-metal composite as of the moderation layer 44, e.g. SiC-Al composite, may be employed as material of the covering layer 45. The composite for the covering layer 45 is conductive, having sufficient metal content. This is not to insulate the chucking electrode 43 from the main body 41.
Structure for fixing the dielectric plate 42 is also significant in view of restraining transformation of the dielectric plate 42. If the dielectric plate 42 is fixed locally, e.g. by screwing, thermal transformation of the dielectric plate 42 would be aggravated because it is in a state pinched at the fixation points and thermal conductivity is enhanced locally at the fixation points. In this embodiment, the dielectric plate 42 is in junction with the chucking electrode 43 by such brazing material as one of which main component is aluminum or indium. “Main component” here implies pure aluminum or pure indium, in addition to one including some additive. For example, the junction is performed by whole-surface brazing. Concretely, a thin sheet made of aluminum or indium is inserted between the dielectric plate 42 and the moderation layer 44. By cooling them after heating them up a required hot temperature, the dielectric plate 42 is fixed with the moderation layer 44. In this blazing, it is preferable that pressure ranging from 1 MPa to 2 MPa is mechanically applied with the heating at a temperature ranging from 570° C. to 590° C., in view of enhancing the thermal contact and the mechanical strength. Such the junction by brazing restrains transformation of the dielectric plate 42 further effectively. It is also practical to braze the moderation layer 44 and the chucking electrode 43, and to braze the chucking electrode 43 and the covering layer 45, in the same way. The dielectric plate 42 and the moderation layer 44 may be soldered by solder of which main component is tin or lead.
Next will be described the embodiment of the substrate processing apparatus of the invention. The apparatus of the present invention is to process a substrate, maintaining it at a temperature higher than room temperature. In the following description, a plasma etching apparatus is adopted as an example of substrate processing apparatuses. Also in the following description, “object” is replaced with “substrate” that is the sub-concept of it.
FIG. 3 is a schematic front cross-sectional view of the substrate processing apparatus as the embodiment of the invention. The apparatus shown in FIG. 3 comprises a process chamber in which plasma etching is carried out onto the substrate 9, a process-gas introduction line 2 to introduce a process gas into the process chamber 1, a plasma generator 3 to generate plasma in the process chamber 1 by applying energy to the introduced process gas, and an ESC stage 4 to hold the substrate 9 by chucking it electro-statically at a position where the substrate 9 can be etched by a function of the plasma. The ESC stage 4 is almost the same as the described embodiment.
The process chamber is the air-tight vacuum vessel, which is pumped by a pumping line 11. The process chamber 1 is made of metal such as stain-less steel and electrically grounded. The pumping line 11 comprises a vacuum pump 111 such as dry pump and a pumping speed controller 112, thereby being capable of maintaining pressure in the process chamber 1 at 10−3 Pa to 10 Pa.
The process-gas introduction line 2 is capable of introducing the process gas for the plasma etching at a required flow-rate. In this embodiment, such a reactive gas as CHF3 is introduced into the process chamber 1 as the process gas. The process-gas introduction line 2 comprises a gas bomb filled with the process gas, and a feeding pipe interconnecting the gas bomb and the process chamber 1.
The plasma generator 3 generates the plasma by applying radio-frequency (RF) energy to the introduced process gas. The plasma generator 3 comprises an opposed electrode 30 facing to the ESC stage 4, and an RF power source 31 to apply RF voltage to the opposed electrode 30. The RF power source 31 is hereinafter called “plasma-generation source”. Frequency of the plasma-generation source 31 ranges from 100 kHz to several tens MHz. The plasma-generation source 31 is connected with the opposed electrode 30 interposing a matching circuit (not shown). Output of the plasma-generation source 31 may range from 300 W to 2500 W. The opposed electrode 30 is installed air-tightly with the process chamber 1, inserting an insulator 32.
When the plasma-generation source 31 applies the RF voltage to the opposed electrode 30, an RF discharge is ignited with the introduced process gas by RF field provided in the process chamber 1. Through the discharge, the process gas transits to the state of plasma. In case the process gas is fluoride, ions and activated species of fluorine or fluoride are profusely produced in the plasma. Those ions and species reach the substrate 9, thereby etching the surface of the substrate 9.
Another RF power source 6 is connected with the ESC stage 4, interposing a capacitor. This RF power source 6 is to make ions incident onto the substrate 9 efficiently. This RF power source 6 is hereinafter called “ion-incidence source”. When the ion-incidence source 6 is operated in the state the plasma is generated, self-biasing voltage is provided to the substrate 9. The self biasing voltage is negative DC voltage that is generated through the mutual reaction of the plasma and the RF wave. The self-biasing voltage makes ions incident onto the substrate 9 efficiently, thereby enhancing the etching rate.
In this embodiment, a correction ring 46 is provided with the ESC stage 4. The correction ring 46 is installed on the flange part of the dielectric plate 42, being flush with the substrate 9. The correction ring 46 is made of the same or similar material as the substrate 9, e.g. silicon mono-crystal. The correction ring 46 is to prevent non-uniformity or non-homogeneity of the process at the periphery on the substrate 9. Temperature on the substrate 9 tends to be lower at the periphery in comparison with the center, because of heat dissipation from the edge of the substrate 9. For solving this problem, the correction ring 46 made of the same or similar material as the substrate 9 is provided surrounding the substrate 9 to compensate the heat dissociation. The plasma is sustained by ions and electrons released from the substrate 9 during the etching as well. The plasma density tends to be lower at the space facing to the periphery of the substrate 9, because a less number of ions and electrons are released, compared to the center. When the correction ring 46 made of the same or similar material as the substrate 9 is provided surrounding it, amount of ions and electros supplied to the space facing the periphery of the substrate 9 is increased, thereby making the plasma more uniform and more homogeneous.
As described above, the ESC stage 4 comprises the protection ring 49. The protection ring 49 protects the side of the chucking electrode 43 and the electrode flange from the damage by the plasma or discharge. In case the substrate 9 is made of silicon, the silicon-oxide-made protection ring 49 reduces probability to contaminate the substrate 9 even if it is etched.
The ESC stage 4 is installed with the process chamber 1, inserting an insulator 47. The insulator 47 is made of material such as alumina, insulating the main body 41 from the process chamber 1 as well as protecting the main body 41 from the plasma. For preventing leakage of vacuum from the process chamber 1, vacuum seals such as O-rings are provided between the ESC stage 4 and the insulator 47, and between the process chamber 1 and the insulator 47.
The apparatus of this embodiment comprises a temperature controller 5 for controlling temperature of the substrate 9 during the process. As described, temperature of a substrate to be kept during a process, which is hereinafter called “optimum temperature”, is often higher than room temperature. In the plasma etching, however, temperature of the substrate 9 easily exceeds the optimum temperature by receiving heat from the plasma. For solving this problem, the temperature controller 5 cools the substrate 9 and controls temperature of it at the optimum value during the etching.
As shown in FIG. 3, the chucking electrode 43 has a cavity in itself. The temperature controller 5 circulates coolant through the cavity to cool the chucking electrode 43, thereby cooling the substrate 9 indirectly. The cavity preferably has a complex configuration so that area for heat exchange by the coolant can be enlarged. For example, a cavity having complex uneven walls is formed by making a couple of cooling fin-plates face to each other with each fin staggered. The temperature controller 51 comprises a coolant feeding pipe 51 to feed the coolant into the cavity, a coolant drainage pipe 52 to drain the coolant out of the cavity, and a circulator 53 to circulate the coolant controlled at a required low temperature. As the coolant, Fluorinate (trademark of 3M Corporation) is employed, for example. The temperature controller 51 cools the substrate 9 at a temperature ranging from 80° C. to 90° C. by circulating the coolant of 30° C. to 40° C.
The substrate processing apparatus comprises a heat-transfer gas introduction line (not shown) to introduce a gas between the chucked substrate 9 and the dielectric plate 42. The heat-transfer gas introduction is to enhance heat transfer efficiency between the chucked substrate 9 and the dielectric plate 42. The back surface of the substrate 9 and the top surface of the dielectric plate 42 are not completely planar, but rough microscopically. Heat transfer efficiency is poor at spaces formed of the micro roughness on the surfaces, because those are at a vacuum pressure. The heat-transfer gas introduction line introduces a gas of high thermal conductivity, e.g. helium, into the spaces, thereby improving heat transfer efficiency.
The ESC stage 4 comprises lift pins 48 in the inside for accepting and releasing the substrate 9. The lift pins 48 are elevated by an elevation mechanism (not shown). Though only one lift pin 48 appears in FIG. 3, three lift pins 48 are provided actually.
Next will be described operation of the substrate processing apparatus of this embodiment. After a transfer mechanism (not shown) transfers the substrate 9 into the process chamber 1, the substrate 9 is placed on the ESC stage 4 by operation of the lift pins 48. With operation of the chucking power source 40, the substrate 9 is chucked on the ESC stage 4. The process chamber 1 has been pumped at a required vacuum pressure in advance. In this state, the process-gas introduction line 2 is operated to introduce the process gas at a required flow-rate. Then, the plasma-generation source 31 is operated, thereby generating the plasma. The etching is performed utilizing the plasma as described. The temperature controller 5 cools the substrate 9 at an optimum temperature. During the etching, the ion-incidence source 6 is operated for enhancing the etching efficiency. After performing the etching for a required period, operations of the process-gas introduction line 2, the plasma-generation source 31, and the ion-incidence source 6 are stopped. Then, operation of the chucking power source 40 is stopped, dissolving the chucking of the substrate 9. After the process chamber 1 is pumped again, the substrate 9 is transferred out of the process chamber 1 by the transfer mechanism.
In the substrate processing apparatus, though the chucking electrode 43 is heated higher than room temperature, its transformation is restrained by the moderation layer 44 and the covering layer as described. Therefore, transformation of the dielectric plate 42, and displacement or transformation of the substrate 9 caused thereby are restrained as well, Accordingly, the process uniformity and the process homogeneity are enhanced.
The advantage of the moderation layer 44 and the covering layer 45 to restrain the transformation is greatly remarkable in the structure where the correction ring 46 is provided. This point will be described in detail as follows. The correction ring 46 has the configuration essentially equivalent to extending the substrate 9 outward. Material of the correction ring 46 is the same as or similar to the substrate 9. The correction ring 46 is provided on the flange part of the dielectric plate 42, and chucked on it as well as the substrate 9. Probability and volume of transformation of the dielectric plate 42 would be greater at the flange part comparatively, because the flange part is thin and peripheral. If displacement or transformation of the correction ring 46 takes place from transformation of the dielectric part 42, the function to compensate heat dissociation from the edge of the substrate 9 would become out of uniform. Moreover, heat contact of the correction ring 46 onto the dielectric plate 42 would be worsened by the displacement or the transformation, resulting in that temperature of the correction ring 46 rises higher than the substrate 9. What is particularly serious is that the heat-contact deterioration of the correction ring 46 onto the dielectric plate happens randomly. The function of the correction ring 46 to heat the substrate 9 compensatively also becomes random when the heat-contact deterioration of the correction ring 46 becomes random. This leads to much deteriorating reproducibility of the temperature condition on the substrate 9 during the process.
In this embodiment, however, the correction ring 46 is hard to be transformed or displaced, because transformation and displacement of the dielectric plate 42 are restrained by suppressing transformation of the chucking electrode 43. Therefore, this embodiment is free from such the problems as non-uniformity and non-reproducibility of the substrate temperature.
Next will be described the result of an experiment for confirming the effect obtained from the structure of the embodiment. FIGS. 4 to 7 schematically show the result of this experiment. In this experiment, transformation and displacement of the surface of the dielectric plate 42 were measured under conditions of different temperatures or different temperature histories on the ESC stages. The transformation and the displacement are measured by a distance meter. Setting a reference level above the ESC stage, distance from each point on the surface of the dielectric plate 42 to the reference level is measured by the distance meter for detecting height of each point.
FIG. 4 and FIG. 5 both show heights of points on the surface of the convex part of the dielectric plate 42. FIG. 4 shows the heights in case of the prior-art ESC stage without the moderation layer 44 and the covering layer 45. FIG. 5 shows the heights in case of the ESC stage of the described embodiment with the moderation layer 44 and the covering layer 45. FIG. 6 and FIG. 7 both show heights of points on the surface of the flange part of the dielectric plate 42. FIG. 6 shows the heights in case of the prior-art ESC stage without the moderation layer 44 and the covering layer 45. FIG. 7 shows the heights in case of the ESC stage of the described embodiment with the moderation layer 44 and the covering layer 45. Location of each point on the flange part designated by {circle around (1)}, {circle around (2)}, {circle around (3)}, {circle around (4)} in FIG. 6 and FIG. 7 is shown in FIG. 1 by the same {circle around (1)}, {circle around (2)}, {circle around (3)}, {circle around (4)} respectively.
The experiment was carried out, varying temperature of the ESC stages. Temperature of an ESO stage is hereinafter called “stage temperature”. In FIGS. 4 to 7, “A” designates data measured at the stage temperature of 20° C. after leaving the ESC stage at 20° C. for all night long. “B” designates data measured, keeping the stage temperature at 5° C. “C” designates data measured at the stage temperature of 20° C. after cooling the ESC stage at 5° C. “D” designates data measured, keeping the stage temperature at 50° C. “E” designates data measured, forcedly cooling the ESC stage at 20° C. after making the stage temperature 50° C. Though the ESC stage 4 comprises openings for interior members such as the lift pins 48, data at those openings are omitted in FIGS. 4 to 7.
Commonly in FIGS. 4 to 7, level of the dielectric plate 42 is higher when the stage temperature is higher. This results from thermal expansion of the whole ESC stage 4, being natural in a sense. What is the problem is that displacement or transformation of the dielectric plate 42 depends on values of the stage temperature or histories of the stage temperature.
Specifically, each line appearing in FIG. 5 is drawn through points on the surface of the dielectric plate 42, which is hereinafter called “surface level distribution”. As shown in FIG. 5, the surface level distribution is elevated up and down, depending on the stage temperature or the history of the stage temperature, as it keeps the same figure. In short, it is displaced in parallel. This supposedly demonstrates the dielectric plate 42 has not been transformed and has performed the uniform thermal expansion. In FIG. 4, contrarily, the surface level distribution is elevated up and down as it changes the figure, depending on the stage temperature or the history of the stage temperature. In short, it is not displaced in parallel. This supposedly demonstrates transformation of the dielectric plate 42 has taken place. What is the problem in particular that the surface level distribution changes the figure, depending on the history of the stage temperature. As shown in FIG. 4, even in the measurements at the same stage temperature 20° C., the surface level distribution draws different curves in case it was left at 20° C. all night long and in case it was decreased by the forced cooling from 50° C.
The same analysis is applicable to the result at the flange part. As shown in FIG. 6, in case that the moderation layer 44 and the covering layer 45 are provided, the surface level distribution is elevated up and down, keeping the same figure. Contrarily, as shown in FIG. 7, in case that the moderation layer 44 and the covering layer 45 are not provided, the surface level distribution is elevated, changing the figure. Also at each different history of the stage temperature, the surface level distribution draws a different curve in FIG. 7.
The point that the surface level distribution depends on the temperature histories would bring a serious problem with respect to reproducibility of the substrate processing. Substrate processing apparatuses fabricated at manufactures' factories are installed into production lines and used after such works as delivery inspections. However, the temperature histories of the apparatuses until actual substrate processes are initially started are not the same among the apparatuses. Even the apparatuses performing the same processes almost always submit the different temperature histories through works such as delivery inspections in the manufactures' factories and test operations at the users' lines. Moreover, considering each by-piece process of substrates, a temperature history that the ESO stage has submitted until the process for a substrate is carried may differ from another temperature history that the ESO stage has submitted until the process for another substrate is carried out. For example, a temperature history that the ESC stage has submitted while the by-piece processes are continuingly carried out differs from another temperature history of the ESC stage that is initially used for the process of the first substrate. Such a situation happens, for example, when operation of the apparatus is resumed after suspension for the maintenance.
The point that the surface level distribution depends on the history of the stage temperature means that the substrate 9 would be transformed or displaced depending on the history, even if the ESC stage 4 is controlled at a constant temperature by the temperature controller 5. This could be the serious problem with respect to the process reproducibility. In case the moderation layer 44 and the covering layer 45 are provided, however, the surface level distribution does not depend on the history of the stage temperature, with no transformation and no displacement of the substrate 9. Therefore, processes with high reproducibility are enabled only by maintaining the ESC stage 4 at a required temperature.
More-detailed examples belonging to the embodiment will be described as follows.
EXAMPLE 1
    • Material of Chucking Electrode 43: Aluminum
    • Material of Dielectric Plate 42: Magnesia (MgO)
    • Fixation of Dielectric Plate 42: Brazing by Al at 550° C.
    • Material of Moderation Layer 44: SiC—Al composite
    • Thickness of Moderation Layer 44: 1.2 mm
    • Material of Covering Layer 45: SiC—Al composite
    • Thickness of Covering Layer 45: 1.2 mm
    • Chucking Voltage: 500V
EXAMPLE 2
    • Material of Chucking Electrode 43: Aluminum
    • Material of Dielectric Plate 42: Alumina (Al2O3)
    • Fixation of Dielectric Plate 42: Brazing by In at 120° C.
    • Material of Moderation Layer 44: SiC—Cu composite
    • Thickness of Moderation Layer 44: 1.2 mm
    • Material of Covering Layer 45: SiC—Cu composite
    • Thickness of Covering Layer 45: 1.2 mm
    • Chucking Voltage: 500V
In the EXAMPLE 2, “SiC—Cu composite means composite” made of silicon carbide and cupper. Manufacture of this composite may be the same process as of the described SiC—Al composite. Magnesia is superior to alumina in erosion resistance. In case an erosive gas is used as in the etching, the dielectric plate 42 made of magnesia is more preferable. Size of the substrate 9 chucked by any one of the examples is, for example, 300 mm diameter.
Material of the moderation layer 44 and the covering layer 45 is not limited to described SiC—Al composite or SiC—Cu composite. It may be another composite of ceramic and metal. For instance, it may be composite of silicon carbide and nickel, composite of silicon carbide and Fe—Ni—Co alloy, composite of silicon carbide and Fe—Ni alloy, composite of silicon nitride (Si3N4) and nickel, or composite of silicon nitride and Fe—Ni alloy. Moreover, material of moderation layer 44 and the covering layer 45 is not limited to composite of ceramic and metal. What is required is only that it has the thermal expansion coefficient between the chucking electrode 43 and the dielectric plate 42.
There are several types of electrostatic chucking such as the bi-electrode type and the multi-electrode type, in addition to the described mono-electrode type. The bi-electrode type comprises a couple of chucking electrodes, to which voltages of opposite polarity to each other are applied. The multi-electrode type comprises multiple couples of chucking electrodes, applying voltages of opposite polarity to each electrode of each couple. In these types, the chucking electrodes may be buried within the dielectric plate 42. In case of the mono-electrode type, negative DC voltage may be applied for chucking. The present invention is also enabled in these types. Though the described ESC stage chucks the object or substrate 9 on the top surface, it may be overturned, i.e. chucking the object or substrate 9 at the bottom surface. Moreover, the ESC stage may chuck the object or substrate 9 on the side surface, making it uprightly.
Though the plasma etching apparatus was adopted as the example of substrate processing apparatuses in the above description, the present invention is enabled for other apparatuses such as plasma chemical vapor deposition (CVD) apparatuses and sputtering apparatuses. The temperature controller 5 may heat the substrate 9 and maintain it at a required temperature. There are many other applications of the ESC stage than substrate processing, for example a test of an object such as an environmental testing apparatus.

Claims (26)

1. An electrostatic chucking stage for electro-statically chucking an object, comprising:
a dielectric plate on which the object is chucked;
a chucking electrode to which voltage for dielectrically polarizing the dielectric plate is applied;
a moderation layer provided between the dielectric plate and the chucking electrode, and having a thermal expansion coefficient between a thermal expansion coefficient of the dielectric plate and a thermal expansion coefficient of the chucking electrode;
a covering layer provided on the chucking electrode at a side opposite to the dielectric plate so that the chucking electrode is sandwiched by the moderation layer and the covering layer, said covering layer having a thermal expansion coefficient between the thermal expansion coefficient of the dielectric plate and the thermal expansion coefficient of the chucking electrode; and
wherein the moderation layer and the covering layer have structures comprising metal filled into porous bulks made of ceramic,
wherein the thermal expansion coefficients of the moderation layer and the covering layer are obtained by adjusting volume opening ratios of the porous bulks,
wherein the chucking electrode has a flange part at a periphery thereof and is fixed to a metallic main body by screwing at the flange part, and the covering layer is inserted between the chucking electrode and the main body in an interfacial recess inner to the flange part,
wherein the moderation layer and the covering layer are separated so as not to cover an end of the electrode, and
wherein the electrode and the metallic main body are electrically conducted through the metal filled into the porous ceramic of the covering layer to apply the voltage for chucking without a connecting line through the covering layer.
2. An electrostatic chucking stage for electro-statically chucking an object as claimed in claim 1, wherein the dielectric plate is made of magnesia, the chucking electrode is made of aluminum, and the moderation layer and the covering layer are made of composite of aluminum and ceramic.
3. An electrostatic chucking stage for electro-statically chucking an object as claimed in claim 2, wherein the dielectric plate and the moderation layer are brazed with a brazing material containing aluminum as a main component.
4. An electrostatic chucking stage for electro-statically chucking an object as claimed in claim 2, wherein the dielectric plate and the moderation layer are soldered with solder containing tin as a main component.
5. An electrostatic chucking stage for electro-statically chucking an object as claimed in claim 2, wherein the dielectric plate and the moderation layer are soldered with solder containing lead as a main component.
6. An electrostatic chucking stage for electro-statically chucking an object as claimed in claim 1, wherein the dielectric plate is made of alumina, the chucking electrode is made of aluminum, and the moderation layer and the covering layer are made of composite of aluminum and ceramic.
7. An electrostatic chucking stage for electro-statically chucking an object as claimed in claim 6, wherein the dielectric plate and the moderation layer are brazed with a brazing material containing indium as a main component.
8. A substrate processing apparatus for processing onto a substrate as the substrate is maintained at a temperature higher than room temperature, comprising an electrostatic chucking stage as claimed in claim 1 for holding the substrate during process.
9. A substrate processing apparatus as claimed in claim 8, comprising a plasma generator for generating plasma at a space facing the substrate, wherein the process utilizes the plasma.
10. An electrostatic chucking stage for electro-statically chucking an object, comprising:
a dielectric plate on which the object is chucked;
a chucking electrode to which voltage for dielectrically polarizing the dielectric plate is applied;
a moderation layer provided between the dielectric plate and the chucking electrode, and having a thermal expansion coefficient between a thermal expansion coefficient of the dielectric plate and a thermal expansion coefficient of the chucking electrode, said moderation layer having a peripheral side open for thermal expansion without being covered by the dielectric plate;
a covering layer provided on the chucking electrode at a side opposite to the moderation layer so that the chucking electrode is sandwiched by the moderation layer and the covering layer, said covering layer having a thermal expansion coefficient between the thermal expansion coefficient of the dielectric plate and the thermal expansion coefficient of the chucking electrode; and
a protection ring surrounding a peripheral side of the chucking electrode, and being provided separately from the dielectric plate and the moderation layer, wherein
the moderation layer and the covering layer have structures comprising metal filled into porous bulks made of ceramic,
wherein the thermal expansion coefficients of the moderation layer and the covering layer are obtained by adjusting volume opening ratios of the porous bulks,
wherein the chucking electrode has a flange part at a periphery thereof and is fixed to a metallic main body by screwing at the flange part, and the covering layer is inserted between the chucking electrode and the main body in an interfacial recess inner to the flange part,
wherein the moderation layer and the covering layer are separated so as not to cover an end of the electrode and so as to allow the electrode thermally expand at the end thereof,
and wherein the electrode and the metallic main body are electrically conducted through the metal filled into the porous ceramic of the covering layer to apply the voltage for chucking without a connecting line through the covering layer.
11. An electrostatic chucking stage for electro-statically chucking an object as claimed in claim 10, wherein the dielectric plate is made of magnesia, the chucking electrode is made of aluminum, and the moderation layer and the covering layer are made of composite of aluminum and ceramic.
12. An electrostatic chucking stage for electro-statically chucking an object as claimed in claim 11, wherein the dielectric plate and the moderation layer are brazed with a brazing material containing aluminum as a main component.
13. An electrostatic chucking stage for electro-statically chucking an object as claimed in claim 11, wherein the dielectric plate and the moderation layer are soldered with solder containing tin as a main component.
14. An electrostatic chucking stage for electro-statically chucking an object as claimed in claim 11, wherein the dielectric plate and the moderation layer are soldered with solder containing lead as a main component.
15. An electrostatic chucking stage for electro-statically chucking an object as claimed in claim 10, wherein the dielectric plate is made of alumina, the chucking electrode is made of aluminum, and the moderation layer and the covering layer are made of composite of aluminum and ceramic.
16. An electrostatic chucking stage for electro-statically chucking an object as claimed in claim 15, wherein the dielectric plate and the moderation layer are brazed with a brazing material containing indium as a main component.
17. A substrate processing apparatus for processing a substrate as the substrate is maintained at a temperature higher than room temperature, comprising an electrostatic chucking stage as claimed in claim 10 for holding the substrate during process.
18. A substrate processing apparatus as claimed in claim 17, comprising a plasma generator for generating plasma at a space facing the substrate, wherein the process utilizes the plasma.
19. An electrostatic chucking stage for electro-statically chucking an object, the stage comprising:
a dielectric plate for chucking the object;
a chucking electrode for receiving a voltage for dielectrically polarizing the dielectric plate;
a first layer provided between the dielectric plate and the chucking electrode, and having a thermal expansion coefficient between a thermal expansion coefficient of the dielectric plate and a thermal expansion coefficient of the chucking electrode;
a second layer provided on the chucking electrode so that the chucking electrode is sandwiched by the first layer and the second layer, the second layer having a thermal expansion coefficient between the thermal expansion coefficient of the dielectric plate and the thermal expansion coefficient of the chucking electrode; and
a main body supporting the second layer,
wherein the first and second layers and the main body are electroconductive, and
wherein for connecting electrical power to the chucking electrode, an electrical power providing portion is connected to the main body, which conducts to the chucking electrode through the second layer.
20. An electrostatic chucking stage for electro-statically chucking an object according to claim 19 , wherein the dielectric plate is made of magnesia, the chucking electrode is made of aluminum, and each of the first layer and the second layer is made of a composite of aluminum and ceramic.
21. An electrostatic chucking stage for electro-statically chucking an object according to claim 20 , wherein the dielectric plate and the first layer are brazed with a brazing material containing aluminum as a main component.
22. An electrostatic chucking stage for electro-statically chucking an object according to claim 20 , wherein the dielectric plate and the first layer are soldered with solder containing tin as a main component.
23. An electrostatic chucking stage for electro-statically chucking an object according to claim 20 , wherein the dielectric plate and the first layer are soldered with solder containing lead as a main component.
24. An electrostatic chucking stage for electro-statically chucking an object according to claim 19 , wherein the dielectric plate is made of alumina, the chucking electrode is made of aluminum, and each of the first layer and the second layer is made of a composite of aluminum and ceramic.
25. An electrostatic chucking stage for electro-statically chucking an object according to claim 24 , wherein the dielectric plate and the first layer are brazed with a brazing material containing indium as a main component.
26. An electrostatic chucking stage for electro-statically chucking an object, the stage comprising:
a dielectric plate for chucking the object;
a chucking electrode for receiving a voltage for dielectrically polarizing the dielectric plate;
a first layer provided between the dielectric plate and the chucking electrode, and having a thermal expansion coefficient between a thermal expansion coefficient of the dielectric plate and a thermal expansion coefficient of the chucking electrode;
a second layer provided on the chucking electrode so that the chucking electrode is sandwiched by the first layer and the second layer, the second layer having a thermal expansion coefficient between the thermal expansion coefficient of the dielectric plate and the thermal expansion coefficient of the chucking electrode; and
a main body supporting the second layer,
wherein the first layer and the second layer have structures comprising metal filled into porous bulks made of ceramic,
wherein the thermal expansion coefficients of the first layer and the second layer are obtained by adjusting volume opening ratios of the porous bulks,
wherein the first and second layers and the main body are electroconductive, and
wherein for connecting electrical power to the chucking electrode, an electrical power providing portion is connected to the main body, which conducts to the chucking electrode through the second layer.
US12/470,231 2002-04-16 2009-05-21 Electrostatic chucking stage and substrate processing apparatus Expired - Lifetime USRE42175E1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/470,231 USRE42175E1 (en) 2002-04-16 2009-05-21 Electrostatic chucking stage and substrate processing apparatus

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2002113563A JP4082924B2 (en) 2002-04-16 2002-04-16 Electrostatic chuck holder and substrate processing apparatus
JP2002-113563 2002-04-16
US10/413,136 US7220319B2 (en) 2002-04-16 2003-04-15 Electrostatic chucking stage and substrate processing apparatus
US12/470,231 USRE42175E1 (en) 2002-04-16 2009-05-21 Electrostatic chucking stage and substrate processing apparatus

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US10/413,136 Reissue US7220319B2 (en) 2002-04-16 2003-04-15 Electrostatic chucking stage and substrate processing apparatus

Publications (1)

Publication Number Publication Date
USRE42175E1 true USRE42175E1 (en) 2011-03-01

Family

ID=29395712

Family Applications (2)

Application Number Title Priority Date Filing Date
US10/413,136 Ceased US7220319B2 (en) 2002-04-16 2003-04-15 Electrostatic chucking stage and substrate processing apparatus
US12/470,231 Expired - Lifetime USRE42175E1 (en) 2002-04-16 2009-05-21 Electrostatic chucking stage and substrate processing apparatus

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US10/413,136 Ceased US7220319B2 (en) 2002-04-16 2003-04-15 Electrostatic chucking stage and substrate processing apparatus

Country Status (5)

Country Link
US (2) US7220319B2 (en)
JP (1) JP4082924B2 (en)
KR (1) KR100508459B1 (en)
CN (1) CN1289258C (en)
TW (1) TWI222155B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110292562A1 (en) * 2010-05-28 2011-12-01 Axcelis Technologies, Inc. Matched coefficient of thermal expansion for an electrostatic chuck

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050106794A1 (en) * 2002-03-26 2005-05-19 Fuji Electric Holdings Co., Ltd. Method of manufacturing a semiconductor device
JP4008401B2 (en) * 2003-09-22 2007-11-14 日本碍子株式会社 Manufacturing method of substrate mounting table
JP4349952B2 (en) * 2004-03-24 2009-10-21 京セラ株式会社 Wafer support member and manufacturing method thereof
US20080314320A1 (en) * 2005-02-04 2008-12-25 Component Re-Engineering Company, Inc. Chamber Mount for High Temperature Application of AIN Heaters
US20070029046A1 (en) * 2005-08-04 2007-02-08 Applied Materials, Inc. Methods and systems for increasing substrate temperature in plasma reactors
US20070169703A1 (en) * 2006-01-23 2007-07-26 Brent Elliot Advanced ceramic heater for substrate processing
US8148748B2 (en) * 2007-09-26 2012-04-03 Stmicroelectronics N.V. Adjustable field effect rectifier
US8633521B2 (en) 2007-09-26 2014-01-21 Stmicroelectronics N.V. Self-bootstrapping field effect diode structures and methods
EP3447803A3 (en) 2007-09-26 2019-06-19 STMicroelectronics N.V. Adjustable field effect rectifier
TWI475594B (en) 2008-05-19 2015-03-01 Entegris Inc Electrostatic chuck
KR101701101B1 (en) * 2008-10-31 2017-01-31 램 리써치 코포레이션 Lower electrode assembly of plasma processing chamber
DE102008054982A1 (en) * 2008-12-19 2010-07-01 Carl Zeiss Smt Ag Wafer chuck for EUV lithography
US20100177454A1 (en) * 2009-01-09 2010-07-15 Component Re-Engineering Company, Inc. Electrostatic chuck with dielectric inserts
WO2010127370A2 (en) * 2009-05-01 2010-11-04 Lakota Technologies, Inc. Series current limiting device
US8861170B2 (en) 2009-05-15 2014-10-14 Entegris, Inc. Electrostatic chuck with photo-patternable soft protrusion contact surface
KR101680787B1 (en) 2009-05-15 2016-11-29 엔테그리스, 아이엔씨. Electrostatic chuck with polymer protrusions
JP5396353B2 (en) * 2009-09-17 2014-01-22 日本碍子株式会社 Electrostatic chuck and manufacturing method thereof
US9025305B2 (en) 2010-05-28 2015-05-05 Entegris, Inc. High surface resistivity electrostatic chuck
CN103194730A (en) * 2013-04-09 2013-07-10 上海华力微电子有限公司 Titanium nitride chemical vapor deposition device
WO2015045343A1 (en) * 2013-09-26 2015-04-02 パナソニックIpマネジメント株式会社 Infrared radiation element and production method for same
EP3103136B1 (en) 2014-02-07 2021-06-23 Entegris, Inc. Electrostatic chuck and method of making same
KR101852735B1 (en) * 2015-04-02 2018-04-27 가부시키가이샤 알박 Attraction device and vacuum processing device
JP6584289B2 (en) * 2015-11-04 2019-10-02 東京エレクトロン株式会社 Substrate mounting table and substrate processing apparatus
CN116393336B (en) * 2023-06-09 2023-08-18 太原科技大学 Clamp for spin coating of magnetostrictive material film substrate and using method thereof

Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5539179A (en) 1990-11-17 1996-07-23 Tokyo Electron Limited Electrostatic chuck having a multilayer structure for attracting an object
JPH0945757A (en) 1995-07-28 1997-02-14 Kyocera Corp Electrostatic chuck
JPH1041377A (en) 1996-07-22 1998-02-13 Nhk Spring Co Ltd Electrostatic chuck
US5740009A (en) 1996-11-29 1998-04-14 Applied Materials, Inc. Apparatus for improving wafer and chuck edge protection
JPH10270540A (en) 1997-03-26 1998-10-09 Nippon Cement Co Ltd Electrostatic chuck device and electrostatic chuck base
US5886863A (en) 1995-05-09 1999-03-23 Kyocera Corporation Wafer support member
JPH11157953A (en) 1997-12-02 1999-06-15 Nhk Spring Co Ltd Structure composed of ceramic and metal and electrostatic chuck device produced by using the structure
JPH11168134A (en) 1997-12-03 1999-06-22 Shin Etsu Chem Co Ltd Electrostatic attracting device and manufacture thereof
US6178919B1 (en) 1998-12-28 2001-01-30 Lam Research Corporation Perforated plasma confinement ring in plasma reactors
US6209480B1 (en) 1996-07-10 2001-04-03 Mehrdad M. Moslehi Hermetically-sealed inductively-coupled plasma source structure and method of use
JP2001223261A (en) 2000-02-07 2001-08-17 Hitachi Ltd Electrostatic chuck and electrostatic attraction device
US20010055190A1 (en) * 2000-04-27 2001-12-27 Nhk Spring Co., Ltd. Electrostatic chuck
JP2002033376A (en) 2000-07-17 2002-01-31 Tokyo Electron Ltd Placing device of body to be treated
US6490146B2 (en) 1999-05-07 2002-12-03 Applied Materials Inc. Electrostatic chuck bonded to base with a bond layer and method
US6503368B1 (en) 2000-06-29 2003-01-07 Applied Materials Inc. Substrate support having bonded sections and method
US6549393B2 (en) 2001-08-13 2003-04-15 Hitachi, Ltd. Semiconductor wafer processing apparatus and method
US6756132B2 (en) 2001-03-29 2004-06-29 Ngk Insulators, Ltd. Joined structures of metal terminals and ceramic members, joined structures of metal members and ceramic members, and adhesive materials

Patent Citations (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5539179A (en) 1990-11-17 1996-07-23 Tokyo Electron Limited Electrostatic chuck having a multilayer structure for attracting an object
US5886863A (en) 1995-05-09 1999-03-23 Kyocera Corporation Wafer support member
JPH0945757A (en) 1995-07-28 1997-02-14 Kyocera Corp Electrostatic chuck
US6209480B1 (en) 1996-07-10 2001-04-03 Mehrdad M. Moslehi Hermetically-sealed inductively-coupled plasma source structure and method of use
JPH1041377A (en) 1996-07-22 1998-02-13 Nhk Spring Co Ltd Electrostatic chuck
US5740009A (en) 1996-11-29 1998-04-14 Applied Materials, Inc. Apparatus for improving wafer and chuck edge protection
JPH10270540A (en) 1997-03-26 1998-10-09 Nippon Cement Co Ltd Electrostatic chuck device and electrostatic chuck base
JPH11157953A (en) 1997-12-02 1999-06-15 Nhk Spring Co Ltd Structure composed of ceramic and metal and electrostatic chuck device produced by using the structure
US6535371B1 (en) 1997-12-02 2003-03-18 Takashi Kayamoto Layered ceramic/metallic assembly, and an electrostatic chuck using such an assembly
US6272002B1 (en) 1997-12-03 2001-08-07 Shin-Estu Chemical Co., Ltd. Electrostatic holding apparatus and method of producing the same
JPH11168134A (en) 1997-12-03 1999-06-22 Shin Etsu Chem Co Ltd Electrostatic attracting device and manufacture thereof
US6178919B1 (en) 1998-12-28 2001-01-30 Lam Research Corporation Perforated plasma confinement ring in plasma reactors
US6490146B2 (en) 1999-05-07 2002-12-03 Applied Materials Inc. Electrostatic chuck bonded to base with a bond layer and method
JP2001223261A (en) 2000-02-07 2001-08-17 Hitachi Ltd Electrostatic chuck and electrostatic attraction device
US20010055190A1 (en) * 2000-04-27 2001-12-27 Nhk Spring Co., Ltd. Electrostatic chuck
US6503368B1 (en) 2000-06-29 2003-01-07 Applied Materials Inc. Substrate support having bonded sections and method
JP2002033376A (en) 2000-07-17 2002-01-31 Tokyo Electron Ltd Placing device of body to be treated
US6733624B2 (en) 2000-07-17 2004-05-11 Tokyo Electron Limited Apparatus for holding an object to be processed
US6756132B2 (en) 2001-03-29 2004-06-29 Ngk Insulators, Ltd. Joined structures of metal terminals and ceramic members, joined structures of metal members and ceramic members, and adhesive materials
US6549393B2 (en) 2001-08-13 2003-04-15 Hitachi, Ltd. Semiconductor wafer processing apparatus and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110292562A1 (en) * 2010-05-28 2011-12-01 Axcelis Technologies, Inc. Matched coefficient of thermal expansion for an electrostatic chuck
US9048276B2 (en) * 2010-05-28 2015-06-02 Axcelis Technologies, Inc. Matched coefficient of thermal expansion for an electrostatic chuck

Also Published As

Publication number Publication date
KR100508459B1 (en) 2005-08-17
US7220319B2 (en) 2007-05-22
CN1472037A (en) 2004-02-04
JP4082924B2 (en) 2008-04-30
TW200308044A (en) 2003-12-16
TWI222155B (en) 2004-10-11
CN1289258C (en) 2006-12-13
KR20030082472A (en) 2003-10-22
US20030222416A1 (en) 2003-12-04
JP2003309168A (en) 2003-10-31

Similar Documents

Publication Publication Date Title
USRE42175E1 (en) Electrostatic chucking stage and substrate processing apparatus
US7175737B2 (en) Electrostatic chucking stage and substrate processing apparatus
US10607867B2 (en) Bolted wafer chuck thermal management systems and methods for wafer processing systems
KR101812646B1 (en) Plasma processing apparatus and method of manufacturing semiconductor device
KR20200052973A (en) Electrostatic chuck assembly, electrostatic chuck and focus ring
CN109075059B (en) Gas distribution plate assembly for high power plasma etching process
US10784142B2 (en) Lift pin system for wafer handling
US20100163188A1 (en) Mounting table structure and processing apparatus
US7619179B2 (en) Electrode for generating plasma and plasma processing apparatus using same
US20030029572A1 (en) Semiconductor wafer processing apparatus and method
KR19980024679A (en) Electrostatic chuck and sample processing method and apparatus using the same
CN101527262A (en) Electrode unit, substrate processing apparatus, and temperature control method for electrode unit
KR20110110006A (en) Plasma processing apparatus and semiconductor device manufacturing method
CN101271859B (en) Plasma processing apparatus and structure therein
WO2003079404A2 (en) An improved substrate holder for plasma processing
CN107026102B (en) Substrate mounting table and substrate processing apparatus
KR100886120B1 (en) Electrostatic chucking stage and substrate processing apparatus
JP4456218B2 (en) Plasma processing equipment
US8052364B2 (en) Coupling member and plasma processing apparatus
JPH07183277A (en) Processing unit
JP2001217304A (en) Substrate stage, substrate processing apparatus and method using the substrate stage
KR100920132B1 (en) Electro Static Chuck having a separable ring and Fabricating method of the same
JP6541355B2 (en) Cooling structure and parallel plate etching apparatus
KR102650167B1 (en) electrostatic chuck and plasma processing apparatus including the same
US20230064141A1 (en) Substrate processing apparatus including electrostatic chuck, substrate processing method, and method of manufacturing electrostatic chuck

Legal Events

Date Code Title Description
FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 8

MAFP Maintenance fee payment

Free format text: PAYMENT OF MAINTENANCE FEE, 12TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1553); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Year of fee payment: 12