WO2000046858A1 - Transistor mos a tension de seuil dynamique equipe d'un limiteur de courant, et procede de realisation d'un tel transistor - Google Patents
Transistor mos a tension de seuil dynamique equipe d'un limiteur de courant, et procede de realisation d'un tel transistor Download PDFInfo
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- WO2000046858A1 WO2000046858A1 PCT/FR2000/000268 FR0000268W WO0046858A1 WO 2000046858 A1 WO2000046858 A1 WO 2000046858A1 FR 0000268 W FR0000268 W FR 0000268W WO 0046858 A1 WO0046858 A1 WO 0046858A1
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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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/82—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
- H01L21/84—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being other than a semiconductor body, e.g. being an insulating body
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1203—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body the substrate comprising an insulating body on a semiconductor body, e.g. SOI
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- Y—GENERAL 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S257/00—Active solid-state devices, e.g. transistors, solid-state diodes
- Y10S257/903—FET configuration adapted for use as static memory cell
-
- Y—GENERAL 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S257/00—Active solid-state devices, e.g. transistors, solid-state diodes
- Y10S257/903—FET configuration adapted for use as static memory cell
- Y10S257/904—FET configuration adapted for use as static memory cell with passive components,, e.g. polysilicon resistors
Definitions
- the present invention relates to an MOS transistor (insulated gate transistor) with dynamic threshold voltage equipped with an integrated current limiter.
- This device is intended in particular to be produced on a SOI (silicon on insulator) type substrate, that is to say a substrate having a thin surface layer of silicon insulated by an underlying oxide layer.
- SOI silicon on insulator
- the invention also relates to a method for producing such a device in a particularly compact form for integration into a circuit.
- CMOS circuits operating with very low supply voltages such as for example microprocessors or digital signal processors (DSP).
- DSP digital signal processors
- a common MOS transistor can be considered to be composed of two intrinsic elements.
- the first element is the MOS transistor proper, in which the current, driven by the gate, flows between the drain and the source, and in which the substrate is subjected to a fixed polarization.
- the second element is a parasitic bipolar transistor for which the drain and the source play the role of emitter and collector, and the substrate the role of the base.
- Document (1) proposes to simultaneously activate the MOS element and the bipolar element in order to increase the total current supplied by the device, this by connecting the gate of the transistor to its substrate. Such a device is however little exploited in view of a significant increase in the static current linked to the operation of the bipolar element. Indeed, a minimum static current is generally required in CMOS circuits.
- Document (2) proposes a hybrid mode of operation of the MOS and shows that, thanks to the connection between the gate and the substrate, the threshold voltage of the MOS can be lowered and the slope of the characteristic of the transistor below the threshold can ' be improved at low voltage, i.e. before the bipolar transistor is activated.
- This operating principle gave birth to the dynamic threshold voltage transistor described in document (3) "Dynamic Threshold Voltage MOSFET” or "DTMOS”.
- the transistor 10 comprises, like any MOS transistor, a drain terminal 12, connected to a source terminal 14 by a channel, and a gate terminal 16 for controlling the current passing through the channel.
- an electrical connection 18 is established between the grid and the substrate.
- a terminal of contact of the substrate to which the electrical connection 18 is connected is identified with the reference 11.
- the threshold voltage V t of a MOS transistor depends on the voltage applied to its substrate.
- V c can be expressed by the following relation.
- V fb is the flat strip voltage
- ⁇ f is the Fermi potential
- ⁇ is the substrate effect coefficient
- V b ⁇ is the potential difference applied between the substrate and the source of the transistor.
- the voltage applied to the grid is also applied to the substrate.
- the threshold voltage is then dependent on the voltage applied to the gate, which justifies the designation of "dynamic threshold voltage transistor".
- the polarization applied to the gate is positive with respect to the source. It causes direct polarization of the junction between substrate and source, and possibly direct polarization of the junction between substrate and drain (depending on the polarization applied to the drain). If a high voltage is applied to the grid, the same voltage applied to the substrate causes a large current to flow through the junction. This contributes to the increase of the total static current in a circuit equipped with the DTMOS component.
- the maximum acceptable voltage for a DTMOS in SOI technology is approximately 0.6 V, in order to limit this junction current to approximately 100 pA per micrometer in width of the transistor.
- the use of a DTMOS at a higher supply voltage requires the insertion of a device making it possible to limit the junction current. Such a device is inserted between the grid and the substrate and is called a current limiter. We can refer to this subject in document (3).
- the current limiter is a second MOS transistor of which different polarization configurations can be envisaged.
- FIG. 2 shows the MOS transistor 10 of FIG. 1, which is equipped with a current limiter in the form of a second MOS transistor 20 inserted between the gate terminal 16 and the substrate terminal 11.
- the gate 26 of the second transistor is biased at the supply voltage in the case of a MOS transistor and is biased to ground in the case of a PMOS transistor.
- FIG. 3 Another possible polarization configuration of the second transistor is illustrated in Figure 3 attached. It differs from the configuration of FIG. 2 essentially by the fact that the gate 26 of the second transistor 20 is now connected to its source.
- the second transistor 20 is a conventional transistor having no access to the substrate. Its substrate is floating.
- the object of the present invention is to propose a DTMOS transistor device with current limiter, not presenting the above difficulties, and capable of being produced in the form of an integrated circuit.
- An object is in particular to propose such a device making it possible to reduce the number and the extent of the necessary connections between the transistors, so as to allow a compact embodiment thereof.
- Another aim is to propose a particularly economical method of producing the device.
- the invention more specifically relates to a semiconductor device comprising, on a substrate:
- a first MOS transistor with dynamic threshold voltage with a gate, and a channel of a first type of conductivity
- the first MOS transistor is equipped with a first doped area of the first type of conductivity, connected to the channel, and the current limiting means comprises a second doped area of a second type of conductivity, disposed against the first doped zone and electrically connected to the first doped zone by an ohmic connection channel.
- a ohmic connection is distinguished between the first and second doped zones from a simple connection by physical contact resulting from the juxtaposition of these regions.
- the ohmic connection can be made, for example, by a layer of electrically conductive material, such as a layer of silicide, which connects the first and second doped zones together.
- the current limiting means can be a second MOS transistor.
- the second doped zone and a third doped zone of the same type of conductivity as the second doped zone can form the source and drain of said transistor.
- the gate of the second transistor can be connected to a gate bias terminal or to the second doped zone, that is to say to the source of the second transistor.
- a common connection terminal can be provided for both the gate and the second doped area.
- the third doped zone that is to say here the drain of the second transistor, can be connected to the gate of the first transistor.
- the current limiting means can also be a diode.
- the third doped zone can be connected to the gate of the first MOS transistor.
- the diode can be equipped with a grid extending above the fourth zone doped.
- This grid does not really have an electrical function but can serve, as will appear in the description which follows, as a mask for implanting the second and third doped zones, to preserve the fourth doped zone.
- the grid of the diode can be left floating or can be connected to one of the terminals of the diode, that is to say to one of the second and third doped zones.
- the invention also relates to a method of manufacturing a device as described above.
- the method comprises the following successive steps: a) preparation in an substrate of an active area, intended to receive the first and second transistors and having a first type of conductivity, b) formation of first and second gates above the active area, corresponding respectively to the first and second transistors, the gates being separated from the substrate by a gate insulator and covering regions channel of the first and second transistors respectively, c) formation of first and second source and drain regions of a second type of conductivity opposite to the first type of conductivity, corresponding respectively to the first and second transistors, by self-aligned ion implantation on the first and second grids, and formation of the first doped zone of the first type of conductivity, in cont act with the channel of the first transistor and adjacent to one of the source and drain regions of the second transistor, by self-aligned ion implantation on the gate of the first transistor, d) formation of a conductive layer in electrical contact with the first doped zone and the one of the
- the process can be completed, after step d) by placing an insulator on the substrate, followed by the formation of contact points on the source, drain and gate regions of the transistors.
- the method may further comprise the connection of the gate of the first transistor to a doped area separate from the first doped area and forming one of the source and drain of the second transistor, and the connection of the gate of the second transistor at the first doped zone.
- the gate of the first MOS transistor is connected to the drain of the second transistor, that is to say to the third doped zone.
- the method of manufacturing the device comprises the following successive steps: a) preparation in a substrate of a so-called active area having a first type of conductivity, intended to receive the first transistor and the diode, b) formation of a first and a second gate above the corresponding active area respectively to the first transistor and to the diode, the gates being separated from the substrate by a gate insulator, c) formation of the source and drain regions of the first transistor and of said second doped zone, formation of the first doped zone disposed between a channel of the first transistor and the second doped zone, and formation of the third doped zone separated from the first doped zone by the second doped zone, the source and drain regions and the first doped zone being formed by self-aligned implantations on the first grid, d) formation of a conductive layer in contact with the first doped zone and the second doped zone so as to connect them electrically.
- the different regions or doped zones formed during step c) can be in any order.
- the process can be completed, after step d), by the installation of an insulator on the substrate followed by the formation of contact points on the source and drain regions and on the third doped zone.
- It may further comprise the interconnection of the third doped zone and the gate of the first transistor.
- the device is preferably produced on an SOI type substrate, that is to say a substrate having a thin silicon surface layer, isolated by an oxide layer buried in a silicon block which acts as a support.
- the components are in this case formed in the thin surface layer.
- This layer is generally not doped initially.
- the preparation step a) may include light doping of the first type of conductivity, of all or part of the thin surface layer.
- the active region can be delimited by local oxidation of the thin surface layer to form blocks of field oxide. This surface isolation technique is usually referred to as "LOCOS" (Localized Oxidation of Silicon).
- LOCS Localized Oxidation of Silicon
- the active region can also be delimited by a trench isolation ("Shallow Trench Isolation")
- the active area is thus completely isolated by the field oxide pavers and by the buried oxide layer.
- - Figure 1 is an electrical diagram corresponding to a dynamic threshold voltage MOS transistor (DTMOS).
- DTMOS dynamic threshold voltage MOS transistor
- - Figure 2 is an electrical diagram of the transistor of Figure 1, equipped with a current limiter, according to a first configuration of polarization of the limiter.
- - Figure 3 is an electrical diagram of the transistor of Figure 1, equipped with a current limiter, according to a second configuration of polarization of the limiter.
- FIG. 4 shows a first layout diagram for the manufacture of a device according to the invention.
- FIG. 5 is a schematic section of a device according to one invention according to a plane VV shown in Figure 4.
- - Figure 6 shows a second layout diagram for the manufacture of a device according to the invention .
- FIG. 7 is a schematic section of a device according to the invention according to a plane VII-VII shown in Figure 6.
- FIG. 8 shows a third layout diagram for the manufacture of a device according to the invention.
- FIG. 9 is a schematic section of a device according to the invention according to a plane IX-IX indicated in FIG. 8.
- FIG. 13 is a fourth layout diagram for the manufacture of a device according to the invention, according to the electrical diagram in FIG. 10.
- FIG. 14 is a diagrammatic section of a device according to the invention according to a plane XIV-XIV indicated in FIG. 13.
- - Figure 15 is a fifth layout diagram for the manufacture of a device according to the invention, according to the electrical diagram of Figure 10.
- - Figure 16 is a sixth layout diagram for the manufacture of a device according to the invention, according to the electrical diagram in FIG. 10.
- FIG. 17 is a seventh layout diagram for the manufacture of a device according to the invention, according to the electrical diagram of FIG. 10.
- the following description refers to the manufacture of the device in the silicon surface layer of an SOI type substrate.
- the plane of Figure 4 corresponds to a top view of the device according to a first embodiment.
- a solid line 100 in FIG. 4 represents the limit of the active area 102 defined on the surface layer of silicon. Outside the area defined by the line
- the surface layer of silicon is oxidized in order to laterally isolate the active area.
- the implanted doping impurities reaching the silicon oxide which surrounds the active zone are inoperative and do not modify the electrical insulating nature of the oxide.
- At least a first P-type implantation is performed in two implantation areas 110, 120, which correspond in particular to the channels of a first and a second transistors 10 and 20 that it is desired to form. These areas are represented by a regular broken line in the figure and are defined, for example, by an opening in a layout mask which is not shown.
- these transistors correspond to the DTMOS transistor and to the transistor of the current limiter within the meaning of the invention.
- the first implantation is of type P insofar as the transistors 10 and 20 which it is desired to produce are NMOS transistors.
- the device can however also be produced with PMOS transistors.
- the first implantation is of type N.
- the first implantation is followed by the formation of an insulating layer, for example of oxide, then of a layer of grid material, for example of polycrystalline silicon.
- the layers are etched according to a pattern making it possible to fix the shape and the location of grids 116 and 126 of the first and second transistors respectively. It is observed that the gate 116 of the first transistor has a T-shape, at least one branch of which extends outside the active area.
- the definition of the grids can be followed by the formation of lateral spacers on their sides. These spacers are not shown in FIG. 4 for reasons of clarity.
- N + and P + are used to designate implantations or implanted regions of conductivity type N and P with a high concentration of doping impurities. It should be noted that the second implantation can also be of the P + type when the transistors formed are PMOS transistors.
- the second implantation takes place in implantation areas 130, 140 extending on either side of at least part of each grid 116, 126.
- the implantation areas 130, 140 are shown in phantom and are defined, for example, by openings in a not shown implantation mask.
- the drain 112 and the source 114 of the first transistor are formed in the active zone as well as the drain 122 and the source 124 of the second transistor.
- the source 124 and the drain 122 respectively correspond to the second and third doped zones mentioned in the first part of the description.
- the N * type zones 112, 114, 122 and 124 do not extend, or only very little, under the grids.
- the grids play the role of implantation mask during implantation, so that the N + type zones are self-aligned on the grids.
- Under the gate 116 of the first transistor 10 is therefore a P-type area resulting from the first implantation. Part of this zone located between the source and drain 112, 114 constitutes the channel 111 of the first transistor 10.
- the channel 121, of type P, of the second transistor 20 is located under the second gate 126 and between the source and drain 124 and 122 of the second transistor.
- a third P "type implantation (or, as an N + alternative for PMOS transistors) is carried out in a range 150 defined, for example, by an implantation mask not shown.
- the implantation range 150 indicated in double-mixed line overlaps a part of the gate 116 of the first transistor and coincides with a part of the active P-type zone and extends to the source 124 of the second transistor. .
- Part of the gate 116 of the first transistor can thus be used as an implantation mask, so that the doped area 160 formed during the third implantation is self-aligned on this gate.
- the doped area 160 of P + type corresponds to the first doped area mentioned above and is thus designated in the remainder of the text. It constitutes a substrate socket for the first transistor 10.
- Self-aligned siliciding on the grids is then practiced. It makes it possible to form a layer of silicide on the active area and on the grids.
- the main function of this layer of silicide is to form an electrical connection by ohmic contact between the first doped zone 160 and the source 124 of the second transistor.
- the silicide layer for example of TiSi or
- CoSi can be formed by depositing a layer of titanium or cobalt, followed by a heat treatment.
- the electrical insulating material is for example a silicon oxide.
- the electrical insulating material is then etched locally, according to a determined pattern, to form access passages to the components and make contact points on them.
- conductive interconnection tracks connected to the contact sockets are formed on the surface of the electrical insulating material.
- references 113, 115, 123, 117, 127 designate contact sockets connected respectively to the drain and to the source of the first transistor, to the drain of the second transistor, and to the gates of the first and second transistors.
- the references 173, 175, 187 designate metallic interconnection tracks, for example in Al,
- Reference 190 designates an interconnection track which connects the contact point 117 of the gate of the first transistor to the contact point 123 of the drain 122 of the second transistor. It can also be observed in FIG. 4 that the contact points 117, 127 on the grids are made outside the active area 102, that is to say above the silicon oxide which surrounds the active area .
- FIG. 5 is a diagrammatic section of the device obtained according to the diagram in FIG. 4 and along the plane V-V indicated in FIG. 4.
- the device is produced in an SOI type substrate comprising a solid part 1 of silicon, a buried layer 2 of silicon oxide and a thin surface layer 3 of silicon.
- an active zone 102 is delimited by blocks of silicon oxide 103 which extend as far as the buried oxide layer. The active area is therefore electrically isolated from the solid part 1 of the substrate and possibly other active areas, not shown, defined in the same surface layer.
- channel 111, of type P, of the first transistor 10 there are, in order, from left to right in the figure, channel 111, of type P, of the first transistor 10, the first doped zone 160 of type P + in contact with channel 111, the source 124 of the second transistor 11, of type N + , in contact with the first doped zone, the channel 121 of type P, of the second transistor 11, then the drain 122, of type N + of the second transistor 11.
- the gates 116 and 126 of the first and second transistors are distinguished respectively.
- the grids for example made of polycrystalline silicon, are separated from the surface layer of silicon 3 by a very thin layer of silicon oxide 4.
- the presence of a layer of titanium silicide or of cobalt 180 is noted.
- the layer of silicide in particular establishes an ohmic electrical contact between the first doped region 160 and source 124 of the second transistor.
- insulating lateral spacers 181 are formed on the lateral flanks of the grids, by deposition of a layer of silicon oxide or nitride and then by anisotropic etching of this layer.
- the lateral spacers 181 essentially have the function of avoiding a short circuit between the grids, the source regions, and the drain regions, during the formation of the silicide layer.
- the lateral spacers can be formed before the implantation of the source regions and drain the transistors, and also serve, like the grids, as an implantation mask for these regions.
- An insulation layer 183 is formed by deposition and then by planarization of a material such as silicon oxide. Layer 183, the flat surface of which coats the grids and covers the silicide layer
- FIG. 5 also shows the contact point 123 which is in the form of a well passing through the insulation layer 183 to reach the silicide layer above the drain 122 of the second transistor.
- the well is filled with an electrically conductive material such as W or Ti which makes it possible to electrically connect the drain to the interconnection track 190.
- Figures 4 and 5 described above correspond to the embodiment of a dynamic threshold voltage transistor of the MOS type.
- Such a PMOS type transistor can also be produced by respectively replacing the N + , P, P + type regions with P + , N and N + regions .
- FIG. 6 is a top view of a layout diagram for producing a DTMOS transistor according to a variant corresponding to the electrical diagram of FIG. 3.
- a large number of elements in FIG. 6 are identical to corresponding elements of FIG. 5. These elements have the same references and their detailed description is omitted here. Reference may be made to the description above.
- a contact point 125 is formed in a region overlapping the first doped region 160 and the source region 124 of the second transistor. It is also connected to the contact point 127 of the gate of the second transistor by an interconnection track 185.
- the contact point 125 essentially constitutes a contact point for the substrate or, more precisely, for the channel of the first transistor.
- FIG. 7 is a section of a device manufactured in accordance with the layout diagram of FIG. 6, seen along the plane VII-VII indicated in this figure .
- the contact point 125 substantially overlaps the first doped region 160 and the source region 124.
- the position of the contact point is not, however, critical. Indeed, as a conductive link exists between the areas mentioned above, due to the silicide layer 180, it is sufficient for the contact point 125 to come into contact with the portion of silicide layer 180 which covers these areas.
- a variant of the device corresponding to the same electrical diagram can also be produced according to the layout plan of FIG. 8.
- This plan differs from that of FIG. 6 by the fact that a single contact socket 128 replaces the socket contact of the gate of the second transistor, the contact point connected to the source and to the first doped zone, as well as the interconnection track which connects them.
- the contact point 128 partially overlaps the gate 126 and the source 124 of the second transistor.
- the conductive material of the contact point 128 electrically connects the gate 126 and more precisely the portion of silicide layer which covers the gate, to the portion of silicide layer which covers the source area 124 and the first doped area 160.
- the contact point 128 can optionally be capped with a metal terminal 189.
- FIG. 10 is an electrical diagram corresponding to a second possible design of the device of the invention in which the second transistor is replaced by a diode 30.
- the anode 32 of the diode 30 is connected to the gate 16 of the first transistor 10 and the cathode 34 of the diode is connected to the substrate of the transistor 10, more precisely to its channel.
- the drain and source terminals of the transistor 10 are always marked with the references 12 and 14.
- a terminal of the substrate, or more precisely of the channel of the transistor carries the reference 11 by analogy with FIGS. 1 to 3.
- the diagram in FIG. 10 corresponds to that of a device constructed around an NMOS type transistor.
- FIG. 11 gives by way of indication the electrical diagram provided for a PMOS transistor. It can be observed that in this case, the cathode 34 of the diode is connected to the gate of the transistor and the anode 32 to the substrate (channel).
- the diode 30, the essential function of which is to limit the current passing through the substrate socket of the transistor, is connected in series with the "diodes" corresponding to the substrate-source and substrate-drain junctions of the transistor.
- FIG. 12 For the device in FIG. 10, using an NMOS transistor, an equivalent electrical diagram is given in FIG. 12.
- references 40 and 50 respectively indicate the "diode” substrate-drain and the "diode” substrate-source of the transistor.
- the references 11, 12, 14 and 16 respectively indicate the substrate, drain, source and gate terminals of the transistor.
- the letters V b , V d , V ⁇ and V g carried in the figure near the terminals of the electrical diagram are used in the rest of the text to designate the substrate, drain, source and gate voltages.
- V is the voltage applied to the terminals of the diode
- n its factor kT of ideality
- U is the thermal potential
- q the q charge of the electron
- k the Boltzmann constant
- T the temperature
- I the current of darkness.
- the current equation of the substrate-source "diode" 50 is:
- I02. are respectively the dark currents of the diodes mentioned above.
- the dark current of the limiting diode is assumed to be different from that of the substrate-source and substrate-drain junctions. Referring to Figure 11, we see that the current passing through the diode limit is equal to the sum of the currents passing through the substrate-drain and substrate-source diodes, ie: The resolution of this equation makes it possible to express the potential of substrate according to the potential of grid:
- V bs obtained reported in equation (1) makes it possible to calculate the change in threshold voltage of the DTMOS transistor with the current limiting diode, as a function of the voltage applied to its gate.
- V t V fb + 2 ⁇ f + ⁇ J2 ⁇ f - - -.
- FIG. 13 shows a layout diagram for the manufacture of a device corresponding to the electrical diagrams of FIGS. 10 and 12.
- the process for manufacturing the transistor 10 and the diode 30 is substantially the same as the process for manufacturing the first transistor 10 and the second transistor 11 in FIG. 4.
- the current limiting means are a diode
- the grid 126 is preserved.
- This grid makes it possible to separate a second doped area 124a of N + type from a third doped area 122a of P + type.
- the second and third doped zones correspond, by their location, to the source and drain zones of the transistor 20 visible in FIGS. 4, 6 and 8.
- the second and third doped zones, of type N + and P + are respectively implanted in implantation areas 140a, 140b defined by implantation masks not shown. Zones of the same type of conductivity can be produced concomitantly. Thus, the second doped zone 124a can be implanted simultaneously with the source and drain zones
- the implantation areas 140a and 140b partially overlap the second grid 126 which also serves as an implantation mask.
- the second and third doped zones are thus self-aligned on the second grid 126.
- a fourth doped zone 121 of P (or N) type which connects the second and third doped zones.
- the fourth doped zone is of P (or N) type due to the initial preparation of the substrate. It is protected by the grid 126 during the implantations of the second and third doped zones.
- the fourth doped zone extends the third doped zone 122a, also of type P + , but whose doping concentration is greater than that of the fourth zone.
- the current limiting diode 30 is formed by the N + / P junction between the second doped zone (or P + / N) 124a and the third doped zone 122a extended by the fourth doped zone 121.
- the second and third doped zones form the terminals of the diode.
- FIG. 13 shows an interconnection line 185 which connects respectively a connection socket 127 in contact with the grid 126 and a connection socket 125 in contact with the first and second doped zones.
- Figure 14 is a cross section of the device corresponding to Figure 13, along a section plane XIV-XIV also shown in Figure 13. Parts identical or similar to those of Figures 5, 7, 9 and 14 are marked with the same references. Reference may be made to their subject in the description above.
- FIG. 14 shows that the first and second doped zones are covered by a portion of silicide layer 180 so that they are at the same electrical potential. The silicide layer in fact provides ohmic electrical contact between these zones.
- the connection socket 125 in contact with the first and second doped zones which is shown in a position overlapping these zones, and which is in contact with the portion of the silicide layer which covers said zones, could be offset above only one of the first and second doped zones.
- Figure 14 also highlights a particular role of the second grid 126 and its lateral spacers. This role is to isolate the portion of silicide layer 180 which covers the first and second doped areas 160, 124a from the portion of this layer which covers the third doped area 122a.
- the references 123 and 190 indicate a contact point on the third doped area 122a and an interconnection track, also visible in FIG. 13, which connects this area to the gate of the transistor.
- the device described above can also be produced according to a layout plan in accordance with FIG. 15.
- FIG. 15 is distinguished from FIG. 13 by the fact that a contact socket 128 provided for the first and second doped zones is positioned so as to overlap the second doped zone and the grid
- the conductive material of the contact point electrically connects the gate to the first and second doped zones.
- FIG. 16 Another variant embodiment of the device is illustrated in FIG. 16.
- the contact point 127 of the grid is connected to the contact point 123 of the third zone doped by an extension of the interconnection track 190.
- FIG. 17 a last variant embodiment of the device, illustrated in FIG. 17 and substantially equivalent to the previous one, saves a specific contact for the grid and the extension of the interconnection track.
- a contact 189 common to the gate 126 and to the third doped area 122a, is arranged so as to overlap these two parts and connect them electrically.
- the contact socket 189 is also connected to the contact socket 117 of the grid of the transistor via an interconnection 190a.
Abstract
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EP00901716A EP1153435A1 (fr) | 1999-02-05 | 2000-02-04 | Transistor mos a tension de seuil dynamique equipe d'un limiteur de courant, et procede de realisation d'un tel transistor |
JP2000597843A JP2002536833A (ja) | 1999-02-05 | 2000-02-04 | 電流リミッタを備えたダイナミックしきい値電圧mosトランジスタ、およびその製造方法 |
US09/890,120 US6787850B1 (en) | 1999-02-05 | 2000-02-04 | Dynamic threshold voltage MOS transistor fitted with a current limiter |
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---|---|---|---|
FR9901369A FR2789519B1 (fr) | 1999-02-05 | 1999-02-05 | Transistor mos a tension de seuil dynamique equipe d'un limiteur de courant, et procede de realisation d'un tel transistor |
FR99/01369 | 1999-02-05 |
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Publication Number | Publication Date |
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WO2000046858A1 true WO2000046858A1 (fr) | 2000-08-10 |
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PCT/FR2000/000268 WO2000046858A1 (fr) | 1999-02-05 | 2000-02-04 | Transistor mos a tension de seuil dynamique equipe d'un limiteur de courant, et procede de realisation d'un tel transistor |
Country Status (5)
Country | Link |
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US (1) | US6787850B1 (fr) |
EP (1) | EP1153435A1 (fr) |
JP (1) | JP2002536833A (fr) |
FR (1) | FR2789519B1 (fr) |
WO (1) | WO2000046858A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US6806539B2 (en) * | 2001-06-19 | 2004-10-19 | Sharp Kabushiki Kaisha | Semiconductor device and its manufacturing method |
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JP2002134746A (ja) * | 2000-10-30 | 2002-05-10 | Toshiba Corp | 半導体装置及びその製造方法 |
JP2003332582A (ja) * | 2002-05-13 | 2003-11-21 | Toshiba Corp | 半導体装置及びその製造方法 |
US20050208857A1 (en) * | 2004-03-19 | 2005-09-22 | Nike, Inc. | Article of apparel incorporating a modifiable textile structure |
US7375402B2 (en) * | 2004-07-07 | 2008-05-20 | Semi Solutions, Llc | Method and apparatus for increasing stability of MOS memory cells |
US7683433B2 (en) * | 2004-07-07 | 2010-03-23 | Semi Solution, Llc | Apparatus and method for improving drive-strength and leakage of deep submicron MOS transistors |
US8247840B2 (en) * | 2004-07-07 | 2012-08-21 | Semi Solutions, Llc | Apparatus and method for improved leakage current of silicon on insulator transistors using a forward biased diode |
US7224205B2 (en) * | 2004-07-07 | 2007-05-29 | Semi Solutions, Llc | Apparatus and method for improving drive-strength and leakage of deep submicron MOS transistors |
CN101443916B (zh) * | 2004-12-29 | 2013-08-14 | 半导体咨询有限责任公司 | 用于改善深亚微米mos晶体管和存储单元的驱动能力、漏电及稳定性的装置和方法 |
US7651905B2 (en) * | 2005-01-12 | 2010-01-26 | Semi Solutions, Llc | Apparatus and method for reducing gate leakage in deep sub-micron MOS transistors using semi-rectifying contacts |
US7898297B2 (en) * | 2005-01-04 | 2011-03-01 | Semi Solution, Llc | Method and apparatus for dynamic threshold voltage control of MOS transistors in dynamic logic circuits |
US7863689B2 (en) * | 2006-09-19 | 2011-01-04 | Semi Solutions, Llc. | Apparatus for using a well current source to effect a dynamic threshold voltage of a MOS transistor |
US7923840B2 (en) * | 2007-01-10 | 2011-04-12 | International Business Machines Corporation | Electrically conductive path forming below barrier oxide layer and integrated circuit |
US8207784B2 (en) * | 2008-02-12 | 2012-06-26 | Semi Solutions, Llc | Method and apparatus for MOSFET drain-source leakage reduction |
US7960229B2 (en) * | 2008-04-10 | 2011-06-14 | Globalfoundries Inc. | Metal oxide semiconductor transistor with reduced gate height, and related fabrication methods |
TWI494673B (zh) * | 2012-09-21 | 2015-08-01 | Innocom Tech Shenzhen Co Ltd | 顯示裝置 |
CN105280715B (zh) * | 2015-11-30 | 2018-05-08 | 上海华虹宏力半导体制造有限公司 | Soi体接触器件结构 |
FR3048288B1 (fr) | 2016-02-25 | 2018-03-23 | Stmicroelectronics (Crolles 2) Sas | Detecteur electronique integre de variations de potentiel a haute sensibilite |
TWI733915B (zh) * | 2016-10-10 | 2021-07-21 | 美商應用材料股份有限公司 | 控制基板的處理的方法,及其研磨系統和電腦程式產品 |
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- 1999-02-05 FR FR9901369A patent/FR2789519B1/fr not_active Expired - Fee Related
-
2000
- 2000-02-04 JP JP2000597843A patent/JP2002536833A/ja active Pending
- 2000-02-04 WO PCT/FR2000/000268 patent/WO2000046858A1/fr active Application Filing
- 2000-02-04 EP EP00901716A patent/EP1153435A1/fr not_active Withdrawn
- 2000-02-04 US US09/890,120 patent/US6787850B1/en not_active Expired - Fee Related
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FR2520556A1 (fr) * | 1982-01-28 | 1983-07-29 | Tokyo Shibaura Electric Co | Dispositif semi-conducteur forme sur un substrat isolant |
EP0616371A2 (fr) * | 1993-03-18 | 1994-09-21 | Canon Kabushiki Kaisha | Dispositif semiconducteur en Silicium sur isolant et méthode pour sa fabrication |
WO1996007205A1 (fr) | 1994-08-30 | 1996-03-07 | The Regents Of The University Of California | Transistor a effet de champ mos a tension de seuil dynamique pour ultra basse tension |
US5808346A (en) * | 1996-07-18 | 1998-09-15 | Mitsubishi Denki Kabushiki Kaisha | Semiconductor device structure which provides individually controllable body-terminal voltage of MOS transistors |
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US6806539B2 (en) * | 2001-06-19 | 2004-10-19 | Sharp Kabushiki Kaisha | Semiconductor device and its manufacturing method |
Also Published As
Publication number | Publication date |
---|---|
JP2002536833A (ja) | 2002-10-29 |
EP1153435A1 (fr) | 2001-11-14 |
US6787850B1 (en) | 2004-09-07 |
FR2789519A1 (fr) | 2000-08-11 |
FR2789519B1 (fr) | 2003-03-28 |
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