WO2005081302A1 - 基板処理装置における処理室のクリーニング方法およびクリーニングの終点検出方法 - Google Patents
基板処理装置における処理室のクリーニング方法およびクリーニングの終点検出方法 Download PDFInfo
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- WO2005081302A1 WO2005081302A1 PCT/JP2005/002394 JP2005002394W WO2005081302A1 WO 2005081302 A1 WO2005081302 A1 WO 2005081302A1 JP 2005002394 W JP2005002394 W JP 2005002394W WO 2005081302 A1 WO2005081302 A1 WO 2005081302A1
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- cleaning
- plasma
- gas
- processing
- substrate
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32917—Plasma diagnostics
- H01J37/32935—Monitoring and controlling tubes by information coming from the object and/or discharge
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/0035—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32192—Microwave generated discharge
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/32798—Further details of plasma apparatus not provided for in groups H01J37/3244 - H01J37/32788; special provisions for cleaning or maintenance of the apparatus
- H01J37/32853—Hygiene
- H01J37/32862—In situ cleaning of vessels and/or internal parts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/3065—Plasma etching; Reactive-ion etching
Definitions
- the present invention relates to a method of cleaning a processing chamber in a substrate processing apparatus and a method of detecting an end point of the cleaning, and more specifically, a method of cleaning a processing chamber contaminated with metal, a method of detecting an end point of cleaning, and the method
- the present invention relates to a computer program and recording medium for execution. Background art
- a silicon wafer containing tungsten is to be processed, and the processing chamber after processing becomes contaminated with tungsten.
- tungsten may adversely affect the treatment and tansane may be taken into the element as contamination, and the oxidation treatment is hindered by tungsten.
- the oxidation rate is reduced. Therefore, the post-treatment processing chamber is cleaned up to a level at which the semiconductor device can be manufactured with contamination levels. You need to lower it.
- plasma cleaning is a method of plasmatizing the cleaning gas to remove deposits deposited in the chamber.
- the end of cleaning is determined by time management.
- time management since the cleaning is ended based on the preset time, the cleaning may be insufficient, or the time may be too long. If the cleaning is not sufficient, the deposits remaining in the chamber cause contamination, so it has to be re-cleaned and it is troublesome. On the contrary, if the cleaning time is too long, the time for that amount is too long. And energy is wasted.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2000-294550
- An object of the present invention is to provide a method of processing a processing chamber in a substrate processing apparatus capable of cleaning a processing chamber contaminated with metal such as tungsten in a substrate processing apparatus with high efficiency. It is in.
- Another object of the present invention is to provide a simple method for detecting an end point of cleaning in cleaning a processing chamber contaminated with metal such as tungsten in a substrate processing apparatus.
- a method and a cleaning method are provided.
- a cleaning method for cleaning a metal-contaminated processing chamber in a substrate processing apparatus for performing a reduced pressure processing on a substrate comprising: A gas containing O is introduced into the processing chamber without
- a cleaning method for cleaning a processing chamber in a substrate processing apparatus for performing plasma processing on a substrate having a film containing a metal which is open to the atmosphere after the above processing. Introducing an O-containing gas into the processing chamber without
- a method of cleaning a processing chamber of a substrate processing apparatus which forms plasma and cleans the processing chamber.
- oxidation treatment of a substrate containing a metal can be provided.
- tungsten can be mentioned as a typical example of the metal.
- plasma processing can be applied as the processing of the substrate.
- a tungsten-based film can be used as the film containing a metal, and as a specific plasma processing, selection of a gate electrode including a tungsten-based film and a polysilicon film is possible. An oxidation treatment can be applied.
- plasma processing and cleaning of the substrate are carried out using plasma or inductive coupling type plasma using a planar antenna. It can be implemented by plasma.
- the plasma processing of the substrate and the cleaning are performed by plasma formed by introducing a microwave into the processing chamber with a planar antenna having a plurality of slots.
- the cleaning may be performed by using an O gas alone.
- Plasma plasma of O gas and inert gas, O gas and H gas and inert gas
- the ratio of H gas to O gas of the plasma for carrying out the cleaning is 4 or more.
- the cleaning should be performed at a temperature of approximately 600 ° C. in the processing chamber. Is preferred. Further, the cleaning is preferably performed with the pressure in the processing chamber set to 67 Pa or less.
- the cleaning may be performed by: plasma of O gas and inert gas;
- the processing chamber may be heated by plasma prior to the cleaning.
- the substrate processing apparatus it is preferable to use one in which at least a part of the surface of the processing chamber exposed to plasma is made of a dielectric.
- a processing chamber in a substrate processing apparatus which operates on a computer and performs plasma processing on a substrate having a film containing a metal at the time of execution is opened to the atmosphere after the processing.
- a gas containing O is introduced into the processing chamber without
- a computer program is provided that controls the substrate processing apparatus to perform a cleaning method to form and clean.
- a storage medium storing a control program operating on a computer, wherein the control program, when executed, performs plasma processing on a substrate having a film containing a metal.
- the control program when executed, performs plasma processing on a substrate having a film containing a metal.
- the processing chamber in the substrate processing apparatus for introducing the gas is introduced into the processing chamber without opening to the atmosphere, and a plasma of the gas is formed.
- a storage medium is provided, which controls the substrate processing apparatus such that a cleaning method of cleaning is performed.
- a plasma supply source for generating plasma
- a processing container for dividing a processing chamber for processing a substrate by the plasma
- a processing container in the processing container A plasma processing is performed on a substrate having a film containing metal, a substrate support on which the substrate is placed, an exhausting means for reducing the pressure in the processing vessel, a gas supply means for supplying a gas into the processing vessel, and After the processing, the processing chamber in the substrate processing apparatus that performs the step of introducing the gas containing O is introduced into the processing chamber without being opened to the atmosphere, and the plasma of this gas is
- a plasma processing apparatus comprising: a control unit that controls a cleaning method to be formed and cleaned.
- plasma processing is performed on a substrate having a film containing a metal.
- the processing chamber in the substrate processing apparatus is not exposed to the atmosphere after the processing, and the processing chamber is not damaged. Introducing a gas containing o, forming a plasma of this gas and cleaning it,
- the end point of the cleaning is detected.
- An end point detection method for cleaning is provided, which measures the light emission intensity of a radical which increases with the progress of cleaning in the processing chamber, and detects the end point of the trailing edge from the value. .
- the cleaning gas is a gas containing hydrogen gas and an inert gas
- the radical is a hydrogen radical.
- the treatment of the substrate is oxidation treatment of the substrate containing the metal-based film.
- the metal-based film is a tungsten-based film.
- the oxidation treatment of the substrate containing the tungsten-based film be a selective oxidation treatment of the polysilicon film in the laminated film containing the tungsten-based film and the polysilicon film.
- the selective oxidation treatment and the cleaning may be performed by a force implemented by an inductive coupling type plasma, a parallel plate type plasma or a planar antenna type plasma, or a planar antenna having a plurality of slots. It is preferable to be implemented by a plasma formed by introducing a microwave into a room.
- a trailing method in which a processing chamber of a plasma processing apparatus used for processing a substrate on which a metal-based film is formed is cleaned by plasma of a cleaning gas.
- a cleaning method which measures the luminous intensity of a radical which increases with the progress of cleaning in the processing chamber and detects the end point of the cleaning.
- the metal-based film is preferably a tungsten-based film.
- a cleaning gas into the processing chamber without opening it to the atmosphere, form plasma of the cleaning gas, and clean the processing chamber.
- the cleaning may be performed by an inductive coupling type plasma, a parallel plate type plasma or a planar antenna type plasma. It is preferable that the process be performed by a plasma formed by introducing a microphone mouth wave into the processing chamber with a flat antenna having a plurality of slots.
- a processing chamber of a plasma processing apparatus that operates on a computer and that is used to process a substrate on which a metal-based film is formed when executed is cleaned by plasma of a cleaning gas.
- the plasma is measured in such a way that a cleaning method is performed to measure the emission intensity of the radical which increases with the progress of Tari Jung in the processing chamber and to detect the end point of the cleaning.
- a control program is provided to control the processing device.
- a computer storage medium storing a control program operating on a computer, wherein the control program is a substrate on which a metal-based film is formed at the time of execution.
- the control program is a substrate on which a metal-based film is formed at the time of execution.
- a plasma supply source for generating plasma
- a processing container for dividing a processing chamber for processing a substrate by the plasma
- the processing container A substrate support on which the substrate is placed, an exhaust unit for decompressing the inside of the processing container, a gas supply unit for supplying a gas into the processing container, and a substrate on which a metal-based film is formed
- a plasma processing apparatus comprising: a control unit that performs control such that a tuning method is performed.
- a processing chamber contaminated with metal by plasma processing or the like of a substrate having a film containing metal is treated with plasma of an O-containing gas in situ without opening to the atmosphere.
- metal components such as tungsten can be oxidized and sublimated, and metal components such as tungsten can be removed extremely effectively. Therefore, To significantly shorten the cleaning time as compared with the conventional cleaning process that required time to open to the atmosphere, time to wet clean, time to re-evacuate, and time to recondition the chamber after evacuation etc. Can.
- the amount of tungsten contamination can be easily grasped by monitoring the emission intensity of hydrogen radicals (H *). can do. This makes it possible to clearly determine the end point of the drying by plasma. Therefore, it is possible to avoid contamination, reworking, excessive cleaning, and the like due to insufficient cleaning, which is a problem in the conventional dry cleaning method with time management.
- H * hydrogen radicals
- FIG. 1 is a cross-sectional view schematically showing an example of a plasma processing apparatus in which a method of cleaning a processing chamber according to a first embodiment of the present invention is performed.
- FIG. 2 A diagram showing the structure of a planar antenna member used in the microwave plasma device of FIG.
- FIG. 3A A schematic view showing the structure of a conventional gate electrode which also has a polysilicon force.
- FIG. 3B is a view showing an example of the structure of a gate electrode including a W-based film to which an embodiment of the present invention is applied.
- FIG. 3C is a view showing another example of the structure of the gate electrode including the W-based film to which the embodiment of the present invention is applied.
- FIG. 4A is a view for explaining a cleaning method according to an embodiment of the present invention.
- FIG. 4B is a view for explaining a cleaning method according to an embodiment of the present invention.
- FIG. 4C is a view for explaining a cleaning method according to an embodiment of the present invention.
- FIG. 4D is a view for explaining a cleaning method according to an embodiment of the present invention.
- FIG. 5 A diagram showing the results of experiments on the difference in W removal effect depending on the gas composition.
- FIG. 6 is a view showing the effect of actually carrying out the cleaning method of the present invention.
- FIG. 7 A diagram showing the change in the thickness of an oxide film and the concentration of W when the cleaning method of FIG. 6 is carried out.
- FIG. 8 Tally when the cleaning method of the present invention is actually carried out by changing the H / O ratio
- FIG. 9 is a view showing the cleaning effect when the cleaning method of the present invention is actually carried out by changing the pressure inside the chamber.
- FIG. 10 is a view showing the cleaning effect when the cleaning method of the present invention is actually carried out by changing the chamber wall temperature (susceptor temperature).
- FIG. 11 A sectional view schematically showing an example of a plasma processing apparatus in which the cleaning method of the processing chamber according to the second embodiment of the present invention is performed.
- FIG. 12 is a graph showing changes in light emission intensity and film thickness depending on the processing order of the sampling wafer when cleaning is performed.
- FIG. 13 is a graph showing changes in emission intensity and W concentration depending on the processing order of the sampling wafer when cleaning is performed.
- FIG. 1 is a cross-sectional view schematically showing an example of a plasma processing apparatus in which a method of cleaning a processing chamber according to a first embodiment of the present invention is performed.
- the microwave plasma processing apparatus 100 is guided by a microwave generation source using RLS A (Radial Line Slot Antenna), which is a planar antenna in which a plurality of slots are formed in a predetermined pattern. It is configured as an RLS A microphone mouth wave plasma processing apparatus that radiates microwaves into the chamber 1 to form a plasma, and is used, for example, for processing to selectively oxidize the sidewall of polysilicon of the gate electrode.
- RLS A Random Line Slot Antenna
- the plasma processing apparatus 100 has a substantially cylindrical chamber 11 which is airtightly configured and grounded.
- a circular opening 10 is formed substantially at the center of the bottom wall la of the chamber 1, and the bottom wall la is in communication with the opening 10, and an exhaust chamber 11 projecting downward is provided.
- a susceptor 2 which also has a ceramic force such as A1N for horizontally supporting a wafer W as a substrate to be processed and a dummy wafer Wd.
- the susceptor 2 is supported by a support member 3 which also serves as a ceramic force such as cylindrical A1N which extends above the central force at the bottom of the exhaust chamber 11.
- Ueno, W at the outer edge of the susceptor 2 A guide ring 4 is provided for idling.
- a heater 5 of a resistance heating type is embedded in the susceptor 2, and the heater 5 is supplied with power from a heater power source 6 to heat the susceptor 2, and the heat is a wafer to be processed by the heat. Heat W.
- temperature control is possible, for example, in the range from room temperature to 800 ° C.
- a cylindrical liner 7 which is also made of dielectric, for example, quartz, is provided on the inner periphery of the chamber 1.
- the susceptor 2 is provided with a wafer support pin (not shown) for supporting and elevating the wafer W so as to be able to protrude and retract with respect to the surface of the susceptor 2.
- An annular gas introduction member 15 is provided on the side wall of the chamber 11, and a gas supply system 16 is connected to the gas introduction member 15.
- the gas introducing member may be arranged in a shower shape.
- the gas supply system 16 includes an Ar gas supply source 17 and an H gas supply source 18
- a gas source 19 is provided, and these gases reach the gas introducing member 15 through the gas line 20 and are introduced into the chamber 11 from the gas introducing member 15.
- Each of the gas lines 20 is provided with a mass flow controller 21 and an on-off valve 22 before and after the mass flow controller 21.
- An exhaust pipe 23 is connected to a side surface of the exhaust chamber 11, and an exhaust device 24 including a high speed vacuum pump is connected to the exhaust pipe 23. Then, by operating the exhaust device 24, the gas is uniformly discharged into the space 11 a of the gas power exhaust chamber 11 in the chamber 1 and is exhausted through the exhaust pipe 23. As a result, the inside of the chamber 1 can be quickly depressurized to a predetermined degree of vacuum, for example, 0.133 Pa.
- a gate valve 26 for opening and closing 25 is provided.
- An upper portion of the chamber 1 is an opening, and an annular support 27 is provided along the periphery of the opening, and the support 27 is provided with a dielectric, for example, quartz or Al.
- a microwave transmitting plate 28 which is also a ceramic force such as 2 3 3 and transmits microwaves is airtightly provided via a seal member 29. Therefore, the inside of the chamber 1 is kept airtight.
- a disk-shaped planar antenna member 31 is provided above the microwave transmitting plate 28 so as to face the susceptor 2.
- the flat antenna member 31 is locked to the upper end of the support 27.
- the planar antenna member 31 is a conductor, for example, a copper plate whose surface is gold-plated or It also serves as an aluminum plate, and has a configuration in which a plurality of microwave radiation holes (slots) 32 are formed through in a predetermined pattern.
- the microwave radiation holes 32 are in the form of a long groove, and adjacent microwave radiation holes 32 intersect each other, typically as shown in FIG.
- the plurality of microwave radiation holes 32 are arranged concentrically. That is, the planar antenna member 31 constitutes an RLS ⁇ antenna.
- the length and arrangement interval of the microwave radiation holes 32 are determined according to the wavelength of the microwaves and the like.
- the microwave radiation holes 32 may have other shapes such as a circular shape and an arc shape.
- the arrangement of the microwave radiation holes 32 is not particularly limited, and may be arranged concentrically, for example, spirally or radially.
- a wave retarding member 33 made of a dielectric having a dielectric constant larger than that of a vacuum is provided.
- a shield cover 34 made of a metal material such as aluminum or stainless steel is provided on the upper surface of the chamber 1 so as to cover the planar antenna member 31 and the wave retarding member 33.
- the upper surface of the chamber 1 and the shield lid 34 are sealed by a seal member 35.
- a cooling water channel 34 a is formed in the shield lid 34.
- the shield lid 34 is grounded.
- An opening 36 is formed in the center of the upper wall of the shield lid 34, and a waveguide 37 is connected to the opening.
- a microwave generator 39 is connected to the end of the waveguide 37 via a matching circuit 38.
- the microwave having a frequency of 2.45 GHz generated by the microwave generator 39 is propagated to the planar antenna member 31 through the waveguide 37.
- 8.35 GHz, 1. 98 GHz, etc. can also be used as the microwave frequency.
- the waveguide 37 includes a coaxial waveguide 37a having a circular cross section extending upward from the opening 36 of the shield lid 34, and a rectangular waveguide 37b having a rectangular cross section extending in the horizontal direction. I have it. A mode change 40 is provided between them. An inner conductor 41 extends at the center of the coaxial waveguide 37 a, and its lower end is connected and fixed to the center of the planar antenna member 31.
- Each component of plasma processing apparatus 100 is connected to and controlled by process controller 50.
- the process controller 50 has a keyboard for a process manager to input commands and the like for managing the plasma processing apparatus 100 and a user interface for displaying and displaying the operation status of the plasma processing apparatus 100 in visual form.
- Ace 51 is connected.
- a storage unit 52 storing a program for causing the computer to execute processing, ie, a recipe, is connected.
- the recipe may be stored in a hard disk or a semiconductor memory, or may be set at a predetermined position of the storage unit 52 in a state of being accommodated in a portable storage medium such as a CD ROM, a DVD, or the like.
- the recipe may be appropriately transmitted from another device, for example, via a dedicated line.
- an arbitrary recipe is called from the storage unit 52 in accordance with an instruction from the user interface 51 and the like, and the process controller 50 is executed to perform plasma processing under the control of the process controller 50.
- the desired processing at device 100 is performed.
- the selective oxidation process of the gate electrode is performed.
- the gate electrode as shown in FIG. 3A, the one in which the polysilicon film 63 is formed on the Si substrate 61 via the gate insulating film 62 has been used. Due to the demand for finer design rules, there is a need to lower the resistance of the gate electrode, and as shown in FIG. 3B, a polysilicon film 63 is formed on the Si substrate 61 via the gate insulating film 62.
- reference numeral 67 denotes a hard mask layer made of, for example, a SiN insulating film, used when etching the gate electrode, and 68 denotes an oxide film formed by selective oxidation.
- the manufacturing process of the tungsten polymetal gate electrode of FIG. 3C as an example the gate insulating film 62 is formed on the Si substrate 61 by, for example, thermal oxidation, and the polysilicon film 63, the tungsten nitride (WN) film 65, and the tungsten (W) are formed thereon by CVD.
- the polysilicon film 63, the tungsten nitride (WN) film 65, and the tungsten (W) are formed thereon by CVD.
- a film 66 and a hard mask layer 67 are sequentially formed, and a photoresist film (not shown) is formed thereon, and then the hard mask layer 67 is etched by using the photoresist film as a mask by photolithography, and then the photoresist Using the film + hard mask layer 67 or the hard mask layer 67 as a mask, the tungsten (W) film 66, the tungsten nitride (WN) film 65, and the polysilicon film 63 are sequentially etched to form a gate electrode structure. The selective oxidation process is performed under the conditions to form an oxide film 68 on the side wall of the polysilicon film 63, and the structure of FIG. 3C is obtained.
- the gate valve 26 is opened, and the wafer W on which the gate electrode is formed is loaded into the chamber 11 from the loading / unloading port 25. And place it on the susceptor 2.
- the pressure inside the chamber is 3 to 700 Pa, for example 6. 7 Pa (50 m
- Torr Torr
- the microwaves from the microwave generator 39 are guided to the waveguide 37 through the matching circuit 38.
- the microwaves are supplied to the planar antenna member 31 sequentially through the rectangular waveguide 37b, the mode converter 40, and the coaxial waveguide 37a, and from the planar antenna member 31 through the microwave transmitting plate 28 to the wafer in the chamber 1 It is emitted to the space above W.
- the H gas, the Ar gas, and the O gas are converted to plasma by the microphone port wave radiated to the chamber 1 through the microwave transmitting plate 28 from the planar antenna member 31.
- This microwave plasma is a low electron temperature plasma with a plasma density of about loUZ cm 3 or more and a low electron temperature of about 0.5-2 eV, and a selective oxidation treatment is performed at a low temperature for a short time to form a thin oxide film.
- the advantage is that the plasma damage such as ions to the base film is small. is there.
- the high-density plasma as described above causes a low H.sub.2 O.sub.2 gas composition in a short time and in a high H.sub.2 / O.
- tungsten (W) adhering to chamber 1 adversely affects the treatment and tungsten (W) is contaminated.
- tungsten (W) interferes with the acid treatment. Therefore, the chamber 1 after the selective oxidation treatment is cleaned to a level of tungsten (W) contamination, for example, on the order of 10 1 toms / cm 2 or less, preferably 10 1 G atoms / cm 2 on the order of 1 or less. Need to Pollution levels are low, so good!
- the chamber 1 contaminated with W is opened to the atmosphere. Conduct.
- this cleaning process will be described with reference to FIG. 4A to FIG. 4D.
- the gate valve 26 is opened to the atmosphere to open the gate valve 26, and from the transfer chamber 70 held in a reduced pressure state, the transfer device 71 is Load a clean dummy Ueno Wd into the chamber 1 and place it on the susceptor 2. This is performed on the dummy wafer Wd in order to protect the susceptor 2 also from plasma power and to observe the surface of the dummy wafer Wd after cleaning the chamber 1 to evaluate the degree of improvement of the contamination state. It is to be noted that the dummy wafer Wd may not be placed if it is not necessary to consider the damage of the susceptor 2 which is not essential in this process.
- the chamber 1 is evacuated while including O from the gas supply system 16.
- microwave generator 39 or
- microwaves are guided to the waveguide 37 through the matching circuit 38, and the rectangular waveguide 37b,
- the mode converter 40, the coaxial waveguide 37a, and the wave delay member 33 are sequentially supplied to the planar antenna member 31 and radiated from the slot of the planar antenna member 31 through the microwave transmitting plate 28 into the chamber 1 , Including O introduced into chamber 1 by this microwave
- Such a cleaning process is preferably performed every time the selective oxidation process of one device wafer is completed.
- the pressure in the chamber 1 is set to, for example, 3-1333 Pa. Among these, 3-6 Pa is preferred, for example, 6.7 Pa is exemplified.
- the temperature in the chamber 1 (for example, the temperature of the susceptor 2) is preferably 45 ° C. or more. At this time, the temperature of the susceptor 2 is preferably as high as 200-800 ° C. S, preferably 400-800 ° C. S. Further, the power of the microwave generator 39 is preferably 1.0-5.
- the gas containing O may be O gas alone, but is preferably O gas + Ar gas.
- O gas + H gas + Ar gas More preferably, O gas + H gas + Ar gas.
- O gas alone,
- the flow rate is preferably 50-lOOOmLzmin, particularly about 100-500mLzmin. If the flow rate of O gas increases too much, the plasma density decreases, so the cleaning effect
- the flow rate for O gas + H gas + Ar gas is: O gas: 10
- the cleaning effect can be enhanced when the flow ratio of H gas to O gas is 2 or more. 4 or more is more preferable and 6 or more.
- O gas + Ar gas and O gas + H gas + Ar gas are alternately repeated, for example, O
- the cleaning effect is further enhanced by intermittently adding H gas to Gas + Ar gas
- the effect can be further enhanced by alternately repeating the supply of the cleaning gas and the evacuation while introducing a vacuum or a purge gas.
- a line for introducing He gas or Ne gas into the chamber 1 is provided in the apparatus of FIG. 1, and plasma of He gas or Ne gas in the chamber 1 immediately before generating plasma of cleaning condition. It is preferable to generate As a result, the surface temperature of the chamber wall can be raised by plasma heating, and the WO is more easily sublimated, so that the cleaning efficiency is increased.
- the W component of the chamber wall can be removed by cleaning the chamber 1 by plasma that does not open to the atmosphere, the time for opening the chamber 1 to the atmosphere can be obtained. , Cleaning time, re-evacuation time, and post-evacuating processing time
- the cleaning time can be significantly shortened compared to the conventional wet taring process, which requires time, etc. it can. For example, what has conventionally been required for at least 2 hours can be 2-30 minutes.
- a plasma process such as the selective oxidation process described above is performed.
- the plasma processing can be performed in a clean state where the W contamination level is extremely low, and disadvantages such as inhibition of the selective acid treatment by W contamination do not occur.
- the power of the microwave generator was set to 3.4 kW, and the microwave was introduced into the chamber, and a plasma was generated for 180 seconds at a wafer temperature of 400 ° C.
- the chamber wall temperature was 45.degree.
- the chamber 1 was cleaned to be in the W free state.
- seasoning in chamber 1 was performed under the same conditions as the subsequent acid treatment.
- Seasoning was performed by performing at least one cycle of oxygen plasma formation and vacuum drawing in the chamber.
- the first bare Si wafer for sampling was placed on the susceptor, and the oxidation treatment was performed under the same conditions as the selective oxidation treatment of polysilicon.
- Power of mouth wave generator 3.4 kW
- wafer temperature 400 ° C.
- chamber wall temperature 45 ° C.
- processing time 110 seconds
- the film thickness of the acid film was 8 nm.
- the first sampling wafer was taken out and the W concentration on the surface was measured.
- the W concentration is It has been confirmed that the product is less than 3 x 10 8 at O ms Zcm 2 and W free (clean).
- the W concentration was measured using the above-mentioned TXRF (the same applies hereinafter). This value is taken as the W concentration of the reference of the chamber.
- an Si wafer having a W film on the surface was placed on a susceptor, and an acid treatment was performed under the same conditions except that the treatment time was changed to 2 minutes, to contaminate the inside of the chamber. This time corresponds to the processing time of about 5 device wafers.
- the wafer with W film was unloaded, the second bare Si wafer for sampling was placed on the susceptor, and the acid treatment was performed under the same conditions as the first wafer. .
- the second sampling wafer was taken out and the W concentration on the surface was measured. As a result, the W concentration on the wafer surface is about 4 ⁇ 10 1G atoms / cm and t3 ⁇ 4 7.
- the 14th bare silicon wafer for sampling is placed on the susceptor, and after the acid treatment is performed under the same conditions as the first wafer for sampling, the 14th sampling wafer is sampled.
- the wafer for use was taken out and the W concentration on the surface was measured. The results of these series of experiments are shown in Figure 6.
- FIG. 6 is a diagram showing the effect of the cleaning of the present invention, with the wafer number (processing order) on the horizontal axis and the W concentration on the wafer surface on the vertical axis.
- the W concentration in the range of the present invention is less than l x l0 ⁇ atoms / cm 2 within 10 minutes of the wafer, ie, within 30 minutes.
- the thickness of the oxide film at the time of selective acid treatment of each sampling wafer was measured.
- the oxide film thickness of each sampling wafer at this time is shown in FIG.
- the W concentration is also plotted in FIG.
- the thickness of the oxide film on the first sampling wafer was 7.99 nm after the processing of 110 seconds
- the second wafer has the acidity of polysilicon due to the contamination of W.
- the film thickness is gradually reduced as the concentration of W decreases, as the film thickness is reduced to 7.75 nm in 110 seconds with the film being blocked.
- the thickness of the oxide film on the 14th wafer was 8.03 nm, and it was confirmed that the inhibition of oxidation by W contamination was resolved.
- there is a strong correlation between the amount of W contamination (W concentration) and the acid film thickness and it is possible to grasp the end point of Tally Jung by the acid film thickness.
- the chamber is first cleaned to be W-free, then seasoning is performed in the chamber 1, and then the first sampling is performed.
- a bare Si wafer for mounting was placed on the susceptor, and the acid treatment was performed in the same manner as the above test. After processing, the first wafer was taken out and the W concentration on the surface was measured, and it was confirmed that the W concentration was below the detection limit.
- a Si wafer having a W film on the surface is placed on a susceptor, and oxidation treatment is performed for 10 minutes corresponding to about 1 lot (equivalent to 25 pieces) of device wafers under the same conditions as the above test. Contaminated with W.
- the wafer with the W film was carried out, the second bare Si wafer for sampling was placed on the susceptor, and the acid treatment was performed under the same conditions as the first wafer. After processing, the second sampling wafer was taken out and the W concentration on the surface was measured. As a result, the W concentration on the wafer surface was as high as 10 12 atoms Z cm 2 .
- the volume ratio, chamber 1 internal pressure, and chamber 1 temperature (susceptor temperature) are changed, and the cleaning process is performed for 180 seconds, and after processing, the third wafer for sampling Si is used as a susceptor.
- the wafer was placed and subjected to an acid treatment under the same conditions as the first sampling wafer. After processing, take out the third sampling wafer and measure the W concentration on the surface.
- the 14th bare silicon wafer for sampling is placed on the susceptor, and acid treatment is performed under the same conditions as the first wafer, and then the 14th wafer is removed. It took out and measured W concentration of the surface.
- the susceptor temperature is 400 ° C.
- the pressure in the chamber is 6. 7 Pa
- the measured value of W concentration is the flow ratio of H gas to O gas (H 2 / O
- H / O ratio is 4 or more from this
- the susceptor temperature is 400 ° C.
- the measured W concentration was lower at 126 Pa when the pressure inside the chamber was lower at 6.7 Pa. From this, it was confirmed that the lower the pressure inside the chamber, the higher the cleaning effect. This is considered to be due to the high vapor pressure of the W compound.
- the measured value of W concentration is lower.
- the W concentration was the lowest among the adopted conditions of 3.6 ⁇ 10 1 G atoms / cm 2 . This is also considered to be due to the increase in the vapor pressure of the W composite, as in the case of changing the pressure.
- the thickness of the oxide film in the 14th wafer at this time is 8. 1 nm, which is almost the same as the initial value, and it was confirmed that the inhibition of acidity caused by the W contamination did not occur.
- FIG. 11 is a cross-sectional view schematically showing an example of a plasma processing apparatus in which the cleaning method of the processing chamber according to the second embodiment of the present invention is performed.
- This plasma processing apparatus 200 is obtained by adding an end point detection function to the plasma processing apparatus shown in FIG. 1 described above, and in FIG. 11, the same components as those in FIG. I omit it.
- a translucent window 80 used for detecting the end point of cleaning is provided in the lower part of the side wall of the chamber.
- a light receiving unit 81 is disposed adjacent to the window 80, and the light receiving unit 81 is electrically connected to a spectral control meter 82 such as a monochromator for measuring the light emission intensity of plasma. Since the position where the window 80 is provided is far from the flat antenna member 31 and not influenced by plasma and is not an exhaust path, stable measurement with less deposits on the window 80 should be performed. Can.
- the installation position of the spectral controller 82 is not particularly limited, and may be any position that can be measured stably.
- the cylindrical liner 7 also having quartz force is provided in the chamber 1, the emission intensity of the radicals in the plasma can be measured through the window 80 and the liner 7. It is possible to provide the liner 7 with an opening. From the viewpoint of preventing adhesion to the window 80, the opening is preferably not provided.
- the process controller 50 is electrically connected to the spectral control meter 82 by the connection wiring 53, and analyzes the information of the light emission intensity such as H * radicals detected by the spectral control meter 82 in addition to the above functions. And determine the end point of the cleaning. Then, according to the instruction of the process controller 50, for example, the cleaning is automatically stopped, or the display of the user interface 51 is displayed that the cleaning is completed.
- the cleaning process is performed according to the above-described FIGS. 4A to 4D.
- the gate valve 26 which is not opened to the atmosphere is opened, and the transfer chamber 70 is kept in a reduced pressure state. If necessary, a clean dummy wafer Wd is carried into the chamber 1 and placed on the susceptor 2.
- a cleaning gas which also has Ar / H / O power is introduced into the chamber 1 from the gas supply system 16.
- Figure 4C shows that
- the microwave generator 39 is introduced into the chamber 1 to make the cleaning gas into plasma. At this time, as shown in FIG. 4D, the inside of the chamber is cleaned by this plasma in the same manner as in the first embodiment.
- the pressure in the chamber 11 is set to, for example, 3-1333 Pa.
- the temperature in the chamber 1 (for example, the temperature of the chamber 1 and the susceptor 2) is preferably 45 ° C. or more. At this time, it is more preferable that the temperature of the susceptor 2 be higher, approximately 400 to 800 ° C.
- the chamber 1 may be continuously evacuated, but it is preferable to intermittently perform the evacuation. In addition, it is effective to flow purge gas at the time of exhausting.
- the cleaning gas to be introduced may be, for example, H gas + Ar gas, but O gas + H gas
- the flow rate for O gas + H gas + Ar gas is: O gas: 10 500 mL Zmi
- the cleaning effect can be further enhanced.
- supply of cleaning gas and evacuation while introducing vacuum or purge gas are alternately repeated.
- the apparatus shown in FIG. 11 may be provided with a line for introducing He gas or Ne gas into the chamber 1 to generate He gas or Ne gas plasma in the chamber 1 immediately before generating cleaning plasma.
- the surface temperature of the chamber wall can be raised by plasma heating, which further facilitates sublimation of the WO, thereby increasing the cleaning efficiency.
- the power of the microwave generator 39 is preferably 1.0-5.
- the emission intensity of the radicals in the plasma in the chamber 1 is measured by the spectrometer 82.
- the spectral control meter 82 divides the light emission power S spectrum of the plasma detected by the light receiving unit 81.
- the emission intensity of a radical eg, hydrogen radical H *
- the end point of the cleaning can be known when the light emission intensity of H * has recovered to almost the initial state (the state before the contamination by W).
- the end point of the cleaning can graph the light emission intensity over time, and also determine the rate of change (for example, the slope of the tangent of the graph of the light emission intensity).
- Tungsten that contaminates the inside of the chamber is often considered to be attached to the chamber wall or the like as an oxide (WO 4). Since H * in the cleaning gas plasma is consumed when reducing this WO, cleaning proceeds and the amount of H * consumed decreases as the residual WO decreases, so the emission intensity of H * is recovered. It is surmised that when the WO remains, the light emission intensity of the WO recovers almost to the initial state (the state before contamination).
- the chamber 11 when the chamber 11 is cleaned by plasma without being opened to the atmosphere, detection of the end point of the cleaning can be performed by monitoring the emission intensity of H *. Since it can be performed accurately and reliably, it is advantageous compared with the conventional tallying method in which the cleaning is finished by time management which eliminates the problem due to the insufficient cleaning and the excessive cleaning. Also, for example, ICP-MS (inductively coupled plasma mass It is not necessary to confirm the end point of tallying by calculating the time and cost with an analyzer) or TXRF (total reflection X-ray fluorescence analysis). In addition, by monitoring the emission intensity of the light, it is also possible to understand that the contamination occurred due to the abnormality in the chamber.
- ICP-MS inductively coupled plasma mass It is not necessary to confirm the end point of tallying by calculating the time and cost with an analyzer
- TXRF total reflection X-ray fluorescence analysis
- H / O 1000/400/50 mL / min, pressure inside the chamber is 6. 7 Pa (50 mT),
- a clean sampling bare Si wafer (wafer No. 1 for sampling) is carried into a chamber free of W contamination, and plasma treated under selective acid process conditions to prepare an optical sample. It was created.
- the internal pressure is 6.7 Pa (50 mT), the power of the microwave generator 3.4 kW, the temperature of the susceptor 2 400 ° C., the chamber wall temperature 45 ° C., and the thickness of the oxide film is 8 nm.
- the W-contaminated wafer is carried out of the chamber 1, and a clean sampling bare silicon wafer (sampling wafer No. 3) is carried in, and the plasma treatment is carried out under the above-mentioned selective oxidation process conditions. Management, and created a monitor sample.
- wafer No. 3 for sampling is unloaded from the chamber 1, plasma cleaning is carried out under the above-mentioned cleaning conditions, and after processing, a bare Si wafer (wafer No. 4 for sampling) for clean sampling is loaded. Selected under the same conditions as wafer No. 1 for sampling. The selective oxidation treatment was performed. Thereafter, the same cleaning process is performed, and then the operation of performing the selective oxidation process under the same conditions as the sampling wafer of wafer No. 1 for sampling is performed. — Repeated about 15).
- the wavelength of H * is monitored by a monochromator, and the emission intensity of H * before processing the W-contaminated wafer and the H after dry tanning * The emission intensity of (wavelength: 656 nm) was compared.
- the results are shown in FIG. In FIG. 12, the light emission intensity when the wafer for sampling No. 1-15 was put in the chamber 1 and the selective oxidation treatment was performed, and the selective oxidation treatment of the wafer Si performed before and after the cleaning treatment were performed.
- the bare Si Ueno for sampling was taken out (wafer No. 16 for sampling), and the amount of W contamination on the surface was measured by TXRF (total reflection fluorescent X-ray analysis). W) was not detected, and it was confirmed that the cleaning was completed.
- the thickness of the oxide film at the time of the selective acid treatment of each sampling wafer was measured.
- the thickness of the oxide film was 7. 85 nm in the processing of 210 seconds, while in the wafer No. 3 for sampling, the oxidation of polysilicon is prevented by the W contamination and oxidation occurs.
- the film thickness was reduced to 7.3 nm in 210 seconds.
- the thickness of the oxide film on wafer No. 15 for sampling is 7.7 nm, and as tallying in the chamber 1 is completed and W contamination is eliminated, oxidation inhibition by W contamination occurs. It has been confirmed that it has gone away.
- a plasma is used to propagate microwaves into a chamber with a planar antenna having a plurality of slots to form a high density plasma at a low electron temperature.
- a processing apparatus an apparatus to which a flat antenna other than such an apparatus configuration is applied and a reflected wave plasma apparatus can be used.
- high frequency power may be applied to the antenna to form plasma by an inductively coupled plasma processing apparatus utilizing an induced electric field generated through the dielectric. This also makes it possible to generate a high density plasma.
- plasma processing apparatus processing such as capacitively coupled plasma, plasma using a magnetron, or processing apparatus other than plasma processing may be any processing apparatus that causes metal contamination in the container (chamber 1). It is applicable.
- the cleaning process is performed by propagating such microwaves into a chamber by a planar antenna having a plurality of slots to generate plasma, and the invention is not limited to this, and other planar planes as described above.
- a plasma to which an antenna is applied or an inductively coupled plasma can also be suitably used, or another plasma such as a capacitively coupled plasma may be used.
- the present invention can also be applied to metals other than the force W shown for the case where the metal is W, such as Co, Ni, Ba, Sr, Ti, Hf, Zr, Ru, Cu and the like. Also, although an example of measuring the emission of hydrogen radicals is shown, any gas that can measure the emission of radicals can be applied.
- An example of detection by measuring the light emission intensity of the added hydrogen radical is not limited to this. It is also possible to replace Ar gas in the above combination with other inert gases (He, Ne, Kr, Xe).
Abstract
Description
Claims
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JP2006510214A JP4836780B2 (ja) | 2004-02-19 | 2005-02-17 | 基板処理装置における処理室のクリーニング方法およびクリーニングの終点検出方法 |
US10/589,511 US7887637B2 (en) | 2004-02-19 | 2005-02-17 | Method for cleaning treatment chamber in substrate treating apparatus and method for detecting endpoint of cleaning |
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Also Published As
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KR100893955B1 (ko) | 2009-04-20 |
JP4836780B2 (ja) | 2011-12-14 |
US7887637B2 (en) | 2011-02-15 |
KR20070112307A (ko) | 2007-11-22 |
KR20060061843A (ko) | 2006-06-08 |
US20070163617A1 (en) | 2007-07-19 |
KR100830749B1 (ko) | 2008-05-20 |
JPWO2005081302A1 (ja) | 2007-10-25 |
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