WO2007063963A1 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- WO2007063963A1 WO2007063963A1 PCT/JP2006/323997 JP2006323997W WO2007063963A1 WO 2007063963 A1 WO2007063963 A1 WO 2007063963A1 JP 2006323997 W JP2006323997 W JP 2006323997W WO 2007063963 A1 WO2007063963 A1 WO 2007063963A1
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- 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 potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/04—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 potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body
- H01L27/08—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 potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including only semiconductor components of a single kind
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- 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 potential barriers; including integrated passive circuit elements having potential barriers
- 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 potential barriers; including integrated passive circuit elements having potential barriers 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 potential barriers; including integrated passive circuit elements having potential barriers 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
- H01L27/1211—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 potential barriers; including integrated passive circuit elements having potential barriers 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 combined with field-effect transistors with a horizontal current flow in a vertical sidewall of a semiconductor body, e.g. FinFET, MuGFET
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- 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
- H01L21/845—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 including field-effect transistors with a horizontal current flow in a vertical sidewall of a semiconductor body, e.g. FinFET, MuGFET
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- 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 potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/04—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 potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body
- H01L27/08—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 potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including only semiconductor components of a single kind
- H01L27/085—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 potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including only semiconductor components of a single kind including field-effect components only
- H01L27/088—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 potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including only semiconductor components of a single kind including field-effect components only the components being field-effect transistors with insulated gate
- H01L27/092—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 potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including only semiconductor components of a single kind including field-effect components only the components being field-effect transistors with insulated gate complementary MIS field-effect transistors
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- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/04—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their crystalline structure, e.g. polycrystalline, cubic or particular orientation of crystalline planes
- H01L29/045—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their crystalline structure, e.g. polycrystalline, cubic or particular orientation of crystalline planes by their particular orientation of crystalline planes
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/785—Field effect transistors with field effect produced by an insulated gate having a channel with a horizontal current flow in a vertical sidewall of a semiconductor body, e.g. FinFET, MuGFET
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/785—Field effect transistors with field effect produced by an insulated gate having a channel with a horizontal current flow in a vertical sidewall of a semiconductor body, e.g. FinFET, MuGFET
- H01L2029/7857—Field effect transistors with field effect produced by an insulated gate having a channel with a horizontal current flow in a vertical sidewall of a semiconductor body, e.g. FinFET, MuGFET of the accumulation type
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- 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
- H01L21/822—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 a semiconductor, using silicon technology
- H01L21/8232—Field-effect technology
- H01L21/8234—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type
- H01L21/8238—Complementary field-effect transistors, e.g. CMOS
- H01L21/823807—Complementary field-effect transistors, e.g. CMOS with a particular manufacturing method of the channel structures, e.g. channel implants, halo or pocket implants, or channel materials
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- H—ELECTRICITY
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- 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
- H01L21/822—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 a semiconductor, using silicon technology
- H01L21/8232—Field-effect technology
- H01L21/8234—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type
- H01L21/8238—Complementary field-effect transistors, e.g. CMOS
- H01L21/823878—Complementary field-effect transistors, e.g. CMOS isolation region manufacturing related aspects, e.g. to avoid interaction of isolation region with adjacent structure
Definitions
- the present invention relates to a semiconductor device such as an IC or LSI.
- FIG. 10 shows a CMOS inverter circuit which is one of electronic circuits used in a semiconductor device as a configuration of a conventional semiconductor device.
- Fig. 10 (a) schematically shows a cross section of the CMOS inverter circuit
- Fig. 10 (b) shows a plan view thereof.
- the display of wiring 8 ⁇ : L 1 is omitted!
- FIG. 10 (a) 1 is a p-type semiconductor substrate on which an electronic circuit is formed
- 2 is an n-type impurity region formed on the p-type semiconductor substrate
- 3a and 3b are n-type impurity regions 2.
- High-concentration p-type impurity regions formed, 4a and 4b are high-concentration n-type impurity regions formed in the p-type semiconductor substrate 1
- 5 is gate electrode 6 and p-type semiconductor substrate 1
- gate electrode 7 and n-type impurity A gate insulating film such as SiO for insulating the region 2 from each other, 6 and 7 are gate insulating films formed on the gate insulating film 5.
- the n-type impurity region 2, the high-concentration p-type impurity regions 3a and 3b, and the gate electrode 7 constitute a p-channel MOSFET (Metal Oxide Semiconductor Field Effect Transistor).
- the semiconductor substrate 1, the high-concentration n-type impurity regions 4a and 4b, and the gate electrode 6 constitute an n-channel MOS FET.
- a gate wiring 8 is connected to the gate electrodes 6 and 7 of the n-channel MOSFET and p-channel MOSFET and applies a common voltage as an input signal of the CMOS inverter circuit.
- Reference numeral 9 is an output wiring connected to the drain electrode of the p-channel MOSFET (high-concentration p-type impurity region 3a) and the drain electrode of the n-channel MOSFET (high-concentration n-type impurity region 4b) to take out the output signal of the CMOS inverter.
- Reference numerals 10 and 11 are power supply lines for supplying a power supply potential to the source electrode of the n-channel MOSFET (high-concentration n-type impurity region 4a) and the source electrode of the channel MOSFET (high-concentration p-type impurity region 3b), respectively. .
- CMOS inverter circuit consisting of an SFET and an n-channel MOSFET grounds the power supply wiring 10 connected to the source electrode of the n-channel 'transistor (0V), and supplies power to the p-channel' transistor source electrode. Apply a power supply voltage (for example, 5V) to wiring 11.
- a power supply voltage for example, 5V
- the n-channel 'transistor' is turned off and the p-channel 'transistor is turned on. Therefore, the same power supply voltage (5 V) as that of the power supply wiring 11 is output to the output S line 9.
- the current flowing through the transistor hardly flows when the output does not change, and flows mainly when the output changes. That is, when the gate wiring 8 becomes 0V, an output current for charging the output wiring 9 flows through the p-channel 'transistor. On the other hand, when the gate wiring 8 reaches 5V, the output wiring through the n-channel' transistor An output current for discharging the charge of 9 flows.
- the CMOS circuit in FIG. 10A is an inverter circuit that outputs a signal having a polarity opposite to that of the input. These inverter circuits must pass the same current through the p-channel 'transistor and n-channel' transistor in order to make the rising speed and falling speed the same when switching.
- the hole which is the carrier of the p-channel 'transistor in the (100) plane has a lower mobility than the electron which is the carrier of the n-channel' transistor, and the ratio is 1: 3. .
- the area of the p-channel transistor and n-channel transistor are the same, the current drive capacity will differ and the operating speed will not be the same. Therefore, as shown in Fig.
- the area of the p-channel 'transistor drain electrode 3a, source electrode 3b, and gate electrode 7 is the same as the area of the n-channel' transistor drain electrode 4b, source electrode 4a, and gate electrode 6
- the switching speed was made equal by increasing the ratio corresponding to the mobility ratio and making the current drive capacity almost the same.
- the area occupied by the p-channel 'transistor is three times as large as that of the n-channel' transistor, and the area occupied by the p-channel 'transistor and the n-channel' transistor is unbalanced, which increases the degree of integration of the semiconductor device. It was an obstacle to improvement.
- Patent Document 1 As a prior art document for improving the current drive capability of a p-channel 'transistor.
- the current driving capability of the p-channel 'transistor is improved by using the (110) plane.
- Patent Document 2 describes that an SOI substrate is used to form an accumulation-type p-channel transistor on the SOI substrate to improve the current drive capability of the p-channel transistor. In the ON state, it is impossible to make the current drive capacities of the same size n-channel 'transistor and p-channel' transistor in the ON state.
- the accelerating transistor disclosed in Patent Document 2 requires a substrate electrode in addition to the gate electrode, and forms a depletion layer in the channel region on both electrodes to pinch off the channel.
- there is a drawback that it is complicated in structure and circuit.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2003-115587
- Patent Document 2 Japanese Patent Laid-Open No. 07-086422
- Patent Document 1 of the prior application the p-channel 'transistor current drive capability is improved, but it is insufficient to make the size of the n-channel' transistor and the p-channel 'transistor the same. It was.
- the present invention increases the degree of integration by making the switching speed of a pair of transistors of different conductivity types constituting a CMOS circuit substantially the same or equivalent and making the electrode area substantially the same or equivalent.
- the object is to obtain a semiconductor device that can be made high.
- Another object of the present invention is to provide an accumulation type transistor that is not complicated in structure and circuit. Means for solving the problem
- a semiconductor device is a semiconductor device including a circuit having at least a pair of transistors having different channel conductivity types on an SOI (Silicon on Insulator) substrate, and is a first device provided on the SOI substrate.
- An n-channel transistor is formed using the first semiconductor insulating layer and the first gate insulating layer covering at least part of the surface of the semiconductor layer, and at least part of the surface of the second semiconductor layer provided on the SOI substrate is formed.
- a p-channel 'transistor is formed using the covering second gate insulating layer, and the surface of the first region forming the channel of the first semiconductor layer is within ⁇ 10 ° from the (110) plane or the (110) plane And the surface of the second region forming the channel on the side surface of the first semiconductor layer is different from the surface within ⁇ 10 ° from the (1 10) plane and the (110) plane From the surface within ⁇ 10 ° from The mobility of electrons is large and the surface of the third region forming the channel of the second semiconductor layer is ⁇ 10 ° from the (110) plane or the (110) plane so that it has one or a plurality of planes.
- the sum of the surface area of the first region and the surface area of the second region is substantially equal to or equal to the surface area of the third region, and
- the width and length of the surface of the first region and the height of the surface of the second region so that the operating speed of the n-channel 'transistor and the p-channel' transistor are substantially equal U or the like.
- the length and length, and the width and length of the surface of the third region are defined.
- Both the n-channel 'transistor and the p-channel' transistor are normally off, the n-channel 'transistor is inversion type or accumulation type, and the p-channel' transistor is inversion type or accumulation type.
- a semiconductor device according to claim 3 is such that both the n-channel transistor and the p-channel transistor are inversion type.
- the semiconductor device according to claim 4 is configured such that both the n-channel transistor and the p-channel transistor are accumulation type.
- the semiconductor device according to claim 5 is such that the n-channel transistor is an inversion type and the p-channel transistor is an accumulation type.
- a semiconductor device according to claim 6 is such that the n-channel 'transistor is an accumulation type and the p-channel' transistor is an inversion type.
- a semiconductor device is formed in the second semiconductor layer by a work function difference between a second gate electrode provided on the second gate insulating film and the second semiconductor layer.
- the material of the second gate electrode and the impurity concentration of the second semiconductor layer are selected so that the thickness of the depletion layer is larger than the thickness of the second semiconductor layer.
- a semiconductor device is formed in the first semiconductor layer by a work function difference between a first gate electrode provided on the first gate insulating film and the first semiconductor layer.
- the material of the first gate electrode and the impurity concentration of the first semiconductor layer are selected so that the thickness of the depletion layer is larger than the thickness of the first semiconductor layer.
- the gate insulating film is an oxide film of SiO 2, Si N and metal silicon alloy formed by microwave-excited plasma, or nitride of metal silicon alloy
- the gate insulating film is formed at a temperature of 600 ° C or lower using microwave-excited plasma.
- a semiconductor device is the length of the surface of the first region, the length of the surface of the second region, and the length of the surface of the third region constituting the channel length. Therefore, only the width of the channel region has to be determined, and the manufacturing is simple and the productivity is improved.
- a semiconductor device is a semiconductor device including a circuit having at least a pair of transistors having different conductivity types, and the first semiconductor layer provided on the SOI substrate and at least a part of the surface thereof A first gate insulating layer covering the first substrate, forming a conductive transistor, and a second semiconductor layer provided on the SOI substrate and a second gate insulating layer covering at least a part of the surface of the second semiconductor layer And forming a channel of the first semiconductor layer so that the surface of the first region has a first crystal plane and the surface of the first region.
- the surface of the second region forming the channel on the side surface of the first semiconductor layer provided on the surface intersecting with the first semiconductor layer is different from the first crystal surface and the second crystal surface having a different carrier mobility. And have said second Chiya of the semiconductor layer
- the surface of the third region forming the channel has the first crystal plane, the transconductance gm on the surface of the first region is gml, and the transconductance gm on the surface of the second region is Let gm2 be larger (i.e. gm2> gml) and let the transconductance gm at the surface of the third region be gm3 that is larger than gml but smaller than gm2 (i.e.
- the surface length is Ll
- the width is W1
- the surface length of the second region is Ll
- the width is W2
- the surface length of the third region is L2
- the one-conductivity-type transistor and the other-conductivity-type transistor are configured such that the operation speeds are substantially equal to or equal to each other while the areas of the channel regions are substantially equal to or equal to each other.
- the second region is formed in a portion where the side surface of the first semiconductor layer is an inclined surface or a vertical surface, and even if only one of both side surfaces is used, a part of the second region is formed from above May be formed up to the bottom.
- the remaining two of Wl, W2, and W3 are determined so as to be substantially satisfied.
- the semiconductor device wherein the second region is a plane substantially perpendicular to the surface of the first region and extends on both sides of the surface of the first region. The two sides are used, the height of the region is H, and W2 is 2H.
- the first conductivity type transistor and the other conductivity type transistor are arranged within ⁇ 10 ° of the first crystal plane from the (110) plane or the (110) plane. It is a thing of the side.
- the one conductivity type transistor and the other conductivity type transistor are an n-channel 'transistor and a p-channel' transistor, respectively.
- a p-channel MOS transistor and an n-channel MOS transistor having the same current driving capability can be obtained by the above configuration.
- the ⁇ channel MOS transistor of the electronic circuit has a planar structure, while the n-channel MOS transistor has a three-dimensional structure, so that the channel area of both transistors can be made the same, and the switching speed is equivalent.
- the switching speed is equivalent.
- FIG. 1 is a diagram showing a semiconductor device according to a first embodiment of the present invention, where (a) is a perspective view, and (b) and (c) are AA ′ in FIG. 1 (a). It is sectional drawing which follows a line and BB 'line.
- FIG. 2 (a), (b), and (c) are cross-sectional views of a semiconductor device according to three other embodiments of the present invention.
- FIG. 3 is a diagram showing the effect of the first exemplary embodiment of the present invention.
- FIG. 4 (a), (b), (c), and (d) are diagrams showing the operation principle of the accumulation type transistor used in the present invention.
- FIG. 5 (a) and (b) are a cross-sectional view and a band structure showing the structure of an accumulation transistor according to the present invention.
- FIG. 6 is a diagram showing lZf noise of an accumulation transistor according to the present invention.
- FIG. 7] (a) and (b) are diagrams showing the relationship between the work function of the gate electrode and the thickness of the SOI layer in the accumulation type transistor according to the present invention.
- FIG. 8 is a relationship diagram between a depletion layer thickness and a substrate impurity concentration of an accumulation type transistor according to an example of the present invention.
- FIG. 9 is a graph showing drain voltage and drain current characteristics of an accumulation transistor according to the present invention.
- FIGS. 10A and 10B are a cross-sectional view and a plan view, respectively, of a conventional semiconductor device.
- FIG. 11 (a), (b), and (c) show the channel orientation and S factor when the gate insulating film is formed by thermal oxidation and when the gate insulating film is formed by radical oxidation. It is a figure for comparing and explaining the relationship.
- FIG. 1 (a) shows the first embodiment of the present invention.
- a schematic perspective view of a semiconductor device FIG. 1 (b) shows a cross-sectional view taken along line AA 'in FIG. 1 (a), and
- FIG. 1 (c) shows a cross-sectional view taken along line BB' in FIG. 1 (a).
- the example in Fig. 1 is an SOI-type three-dimensional CMOS device designed to balance current drive capability with the same dimensions.
- a p-channel MOS transistor is fabricated only on the (110) plane where the hole mobility increases.
- the n-channel MOS transistor is fabricated such that the (100) plane of the side wall having a high electron mobility is formed on the (110) plane, which has a slightly inferior electron mobility. That is, the n-channel 'transistor has a three-dimensional structure and the p-channel' transistor has a planar structure.
- the surface of the SOI layers 14-n and 14-p is preferably such that the channel length direction is the ⁇ 110> direction. This is also the force that maximizes the saturation current amount in the ⁇ 110> direction due to the movement of holes in the (110) plane.
- the saturation current amount due to the movement of electrons on the (100) plane has a small dependence on the crystal direction.
- the n-channel 'transistor forming region 14-n and the p-channel' transistor forming region 14-p in the SOI layer are removed by etching.
- Region 14 n 14 p is separated and formed on oxide film 13
- the SOI layer may be common to both regions as an i layer, or it may be a p-type region 14-p May be converted to n type.
- the substrate concentration may be adjusted by implanting impurities for adjusting the threshold. For example, when the 100 generation, the 4 X 10 18 cm_ 3.
- a side surface of each separated region is a (100) plane. Among these side surfaces, a thick oxide film 25 is formed by a known method on the side surface except for the side surface of the channel region of the n-channel transistor region 14-n, as shown in FIG. 1 (b).
- the thick oxide film 25 can be formed by the following method. First, after depositing SiO 2 by 45 nm or more by CVD, the sidewall is etched using anisotropic etching with little damage.
- the n-channel region of the transistor region 14-n is masked by masking the region other than the transistor region 14-n and wet etching.
- the thick oxide film on the side wall of the region is removed, and the thick oxide film 25 is left on the side wall of the transistor region 14p.
- FIG. 1 (b) after forming the oxide film 25, cleaning is performed, and then gate oxidation is performed using a microwave-excited plasma apparatus, and a 7 nm SiO film 15 is formed into an n-channel transistor region 14 — n
- the channel region is formed on the top and side surfaces of the channel region, and the p channel is formed on the channel region top surface of the transistor region 14 p. At this time, a film thickness for obtaining a desired electric capacity may be formed.
- the gate insulating film 15 is made of metal oxide such as Si N, HfO, ZrO, La O, etc.
- a high dielectric constant material such as metal nitride such as PrSiN may be used.
- polycrystalline silicon containing phosphorus or boron, or a total concentration of phosphorus and arsenic of 10 2 G cm _3 or more is formed, and etched to a desired gate length and gate width to form the gate electrode 16.
- 4 ⁇ 10 15 cm _2 of arsenic is implanted into the source / drain layer 17 of the NMOS transistor region, and 4 ⁇ 10 15 cm _2 of boron is ion-implanted into the source / drain layer 18 of the PMOS transistor region.
- an SiO film is formed by CVD, and as shown in FIG.
- an inversion type (ie, inversion-mode) PMOS transistor ⁇ and an inversion type (ie, inversion mode) NMOS transistor 100 ⁇ are formed on the same substrate. Can be formed.
- the total area of the upper and side surfaces of the n channel 'transition region 14 n and the channel channel upper surface of the p channel' transistor region 14-p are equal, and the operating speeds of both transistors are equal. Like that.
- the length L of the channel region of both transistors 100 ⁇ and 100 ⁇ is made equal, the width of the upper surface of the channel region of n-channel 'transition region 14 n is Wn, the height of the side surface is H, and the p-channel 'Wp is the width of the upper surface of the channel region of transistor region 14-p.
- equation (2) In order for the operating speeds of both the transistors to be equal, equation (2) must be satisfied.
- the mutual conductance in the (100) and (110) planes of the NMOS transistor is gmn (100) and gmn (110), respectively, and the mutual conductance in the (110) plane of the PMO transistor is gmp (l lO).
- these mutual conductances gmn (100), gmn (l lO) , And gmp (l lO) are both known.
- Wn is set to an appropriate value
- the necessary H and Wp can be obtained as a solution to the simultaneous equations of equations (1) and (2).
- the SOI layer has a plane orientation inclined within ⁇ 10 ° from the (110) plane such as the (551) plane, the NMOS transistor and the PMOS transistor have substantially the same current drive capability.
- H is 5. 5nm and Wp will be 33nm.
- the channel length is 25 nm for both transistors.
- the area and gate area can be made almost the same, and the current drive capability of both transistors, and hence the operation speed, can be made almost the same, and a fully balanced CMOS can be obtained.
- the required area can be reduced to less than half compared to the conventional example in FIG. 10, and the operating speed can be increased by an order of magnitude.
- the gate area of both pn transistors the same, the gate capacitance of both transistors becomes the same, and as shown in Fig. 3, the offset noise of analog switches composed of these transistors can be reduced by 15 dB. it can.
- both the PMOS transistor and the NMOS transistor are constituted by inversion type transistors.
- FIGS. 2 (a), (b), and (c) show three embodiments other than FIG. 1 (c), and are sectional views in the direction corresponding to FIG. 1 (c).
- Fig. 2 (a) shows an example where both the n-channel 'transistor (ie, NMOS transistor) 101 ⁇ and the p-channel' transistor (ie, PMOS transistor) 101p are accumulation type
- Fig. 2 (b) shows the n-channel 'transistor ( In other words, NMOS transistor 102 ⁇ is an accumulation type, and p-channel 'transistor (PMOS transistor) 102p capacitor version.
- FIG. 2 (b) has the advantage of simplifying the process because it is formed by the same conductivity type well (n-well) and the same conductivity type (p + type) gate electrode, and n in accumulation mode. By using channel 'transistor, lZf noise of the entire CM OS can be reduced.
- Figure 2 (c) shows an n-channel transistor (NMO S transistor) 103n force nversion type and p-channel 'transistor (PMOS transistor) 1 03p is an example of accumulation type. This example has the advantage that the process is simple because it is formed by the same conductivity type well (p-well) and the same conductivity type (n + type) gate electrode, and the n + type polysilicon gate.
- the use of an accumulation-type transistor has the advantage that the current drive capability is greater than that of the inversion type (Fig. 9).
- accumulation type transistor will be described with reference to FIGS. 4 to 9, taking the n-channel 'transistors (NMOS transistors) 102 ⁇ and 103 ⁇ shown in FIGS. 2 (a) and 2 (b) as examples. To do.
- NMOS transistors n-channel 'transistors
- FIGS. 4 (a) to (d) show the operation principle of an accumulation type n-channel transistor (NMOS transistor).
- NMOS transistor n-channel transistor
- FIGS. 5 (a) and 5 (b) This phenomenon will be described with reference to FIGS. 5 (a) and 5 (b).
- An SOI structure is used, and the depletion layer width generated by the work function difference between the gate electrode and the SOI layer is larger than the thickness of the SOI layer.
- a normally-off MOS transistor can be formed with the accumulation structure as shown in FIG. 5 (a).
- the n-channel 'transistor shown in the figure uses p + polysilicon (work function 5.2 eV) as the gate electrode, and the p-channel' transistor uses n + polysilicon (work function 4. leV) as the gate electrode. This can cause a work function difference from the SOI layer.
- the accumulation type device of the present invention optimizes the work function difference between the gate electrode and the SOI layer, the thickness of the SOI layer, the drain voltage, and the distance between the source and the drain, which is not realized by the pn junction barrier. 5
- the gate voltage is Ov
- a depletion layer exists between the source and drain and a barrier is formed, normally-off occurs.
- Fig. 5 (b) since the channel is formed in the accumulation layer during on-state, the vertical electric field in the channel region is smaller than that of an inversion type MOS transistor that forms a normal inversion layer. The mobility can be increased.
- the mobility does not deteriorate even when the impurity concentration of the SOI layer is high. Furthermore, since the current flows not only in the storage layer but also in the entire SOI layer (balter portion) when the transistor is turned on, the current drive capability can be increased as the impurity concentration of the SOI layer is higher.
- the channel mobility deteriorates when the impurity concentration in the channel region is increased with miniaturization, and the accumulation type device according to the present invention is very effective for miniaturization. It is advantageous.
- the accumulation type n-channel 'transistor has a work function as large as possible! /, Accumulation of the gate electrode It is preferable to use a gate electrode with a p-channel transistor that has a work function as small as possible!
- the accumulation type device of the present invention forms a depletion layer in the SOI layer by increasing the work function difference between the gate electrode material and the SOI layer in this way, and in the channel direction by the voltage applied to the drain electrode. Provide punch-through resistance so that the electric field does not affect the source edge. The thicker the SOI layer, the greater the current drive capability. However, the electric field from the gate generated by the work function difference affects the lower end (bottom surface) of the SOI layer. Therefore, increasing the work function difference is the most important requirement for the accumulation type device of the present invention.
- Figure 7 (a) shows the work function of the gate electrode in an accumulation-type n-channel transistor. Indicates the thickness of the SOI layer allowed (normally off) when the numbers of 5.2eV and 6.OeV are used.
- the gate insulation film shows the case of EOT 0.5 nm and 1. Onm.
- the thickness of the SOI layer in each miniaturization generation (gate length) allowed to be normal is thicker as the work function increases, and in the 22 nm generation, it is about twice as thick as 5.2 eV and 6. OeV. It becomes.
- Fig. 7 (b) shows band diagrams when 5.2 eV and 6. OeV gate electrodes are used. (Insulation thickness 1 nm) 0 As shown in this figure, the SOI layer becomes thicker as the work function increases. And the current drive capability increases.
- FIG. 8 shows a correlation diagram between the depletion layer thickness and the substrate impurity concentration.
- the work function is approximately 5.15 eV, which is 10 17 cm_
- the work function of the n-type silicon layer 14 ⁇ of 3 is approximately 4.25 eV
- a work function difference of approximately 0.9 eV occurs. Since the depletion layer thickness at this time is about 90 nm, the SOI layer is completely depleted even when the thickness is 45 nm.
- Figure 8 shows the relationship between the substrate impurity concentration and the depletion layer thickness when the work function difference is 0.9 V.
- the substrate impurity concentration and the SOI film thickness can be selected in a range where the SOI film thickness is thinner than the depletion layer thickness.
- W, Pt, Ni, Ge, Ru, and its silicide can be used for the gate electrode material, as long as the SOI layer is fully depleted. .
- the gate insulating film of the semiconductor device of the present invention is preferably formed by radical oxidation, radical nitridation, or radical oxynitridation using high-density plasma by microwave excitation, with reference to FIG. explain.
- Fig. 11 (a) is a graph showing the S-factor depending on the channel orientation when the gate insulating film is formed by thermal oxidation and when the gate insulating film is formed by radical oxidation.
- Fig. 11 (b) As a device, measurement was performed using ten three-dimensional p-channel MOS transistors in Accumulation mode as shown in Fig. 11 (b).
- the surface of the channel region is the (100) plane, and its orientation is the 110> direction.
- the specifications of the channel area are as shown in Fig. 11 (a).
- the crystal plane on the surface of the channel region is the (100) plane and the crystal orientation is the 110> direction
- the same crystal plane appears on the side surface of the channel region.
- the crystal plane on the side surface of the channel region is (110) Surface.
- FIG. 11 (c) As shown in FIG. 11 (c), when the orientation of the channel surface is rotated by a ⁇ 110> direction force of 45 ° k, the orientation becomes the ⁇ 100> direction.
- Figure 15 (a) shows the S-fatter at 15 ° intervals when rotated 180 ° in this way.
- the S factor indicates the gate voltage required to increase the drain current by 10 times. The smaller the better, the theoretical force is 60mVZd ec.
- Fig. 11 (a) when a gate insulating film is formed by thermal oxidation (900 ° C dry atmosphere), it is 80-100 mVZdec, 1.3 times to 1.7 times the theoretical value, and the orientation of the crystal plane
- radical oxidation oxidation at 400 ° C with Kr and oxygen plasma
- the SOI layer preferably has a plane orientation inclined within ⁇ 10 ° from the (110) plane.
- the SOI layer has a thickness of the gate electrode and the SOI layer. The structure is thinner than the thickness of the depletion layer due to the work function difference.
- the current drive capability is improved, and the NMOS transistor and the PMOS transistor are balanced so that they have almost the same current drive capability.
- There is also an IJ point where the area of insulation isolation can be reduced by configuring the NMOS transistor and the PMOS transistor on the same semiconductor substrate.
- the present invention has been specifically described based on the embodiments, it is needless to say that the present invention is not limited to the above-described embodiments and can be variously modified without departing from the gist thereof.
- the present invention can be applied not only to a logic circuit as an inverter circuit but also to other electronic circuits.
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Abstract
Description
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US12/085,776 US7800202B2 (en) | 2005-12-02 | 2006-11-30 | Semiconductor device |
JP2007548008A JP5170531B2 (ja) | 2005-12-02 | 2006-11-30 | 半導体装置 |
CN2006800453895A CN101322240B (zh) | 2005-12-02 | 2006-11-30 | 半导体装置 |
EP06833800A EP1959492A4 (en) | 2005-12-02 | 2006-11-30 | SEMICONDUCTOR COMPONENT |
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Cited By (5)
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EP2442363A3 (en) * | 2006-07-13 | 2012-07-11 | National University Corporation Tohoku Unversity | Semiconductor device |
JP2013012768A (ja) * | 2012-09-05 | 2013-01-17 | Tohoku Univ | 半導体装置 |
JP2014107569A (ja) * | 2012-11-26 | 2014-06-09 | Samsung Electronics Co Ltd | 半導体素子 |
US10180420B2 (en) | 2013-06-10 | 2019-01-15 | Roche Diagnostics Operations, Inc. | Methods for detecting an analyte and performing a failsafe step in a body fluid using optical and impedance measurements |
JPWO2018216132A1 (ja) * | 2017-05-24 | 2019-12-19 | 株式会社Fuji | 測定位置決定装置 |
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JP5299752B2 (ja) * | 2008-04-28 | 2013-09-25 | 国立大学法人東北大学 | 半導体装置 |
JP2010067930A (ja) * | 2008-09-12 | 2010-03-25 | Toshiba Corp | 半導体装置およびその製造方法 |
CN102280454B (zh) * | 2011-08-22 | 2013-02-06 | 中国科学院半导体研究所 | 半导体晶体管结构及其制造方法 |
US9224734B2 (en) * | 2013-09-13 | 2015-12-29 | Taiwan Semiconductor Manufacturing Company, Ltd. | CMOS devices with reduced leakage and methods of forming the same |
JP6620656B2 (ja) * | 2016-04-20 | 2019-12-18 | 三菱電機株式会社 | 集積回路 |
CN107919323B (zh) * | 2016-10-10 | 2021-06-08 | 中芯国际集成电路制造(上海)有限公司 | 半导体结构及其形成方法 |
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- 2006-11-30 WO PCT/JP2006/323997 patent/WO2007063963A1/ja active Application Filing
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CN101322240A (zh) | 2008-12-10 |
TWI418030B (zh) | 2013-12-01 |
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TW200733382A (en) | 2007-09-01 |
JP5170531B2 (ja) | 2013-03-27 |
KR101269926B1 (ko) | 2013-05-31 |
JPWO2007063963A1 (ja) | 2009-05-07 |
EP1959492A1 (en) | 2008-08-20 |
US20090166739A1 (en) | 2009-07-02 |
KR20080072930A (ko) | 2008-08-07 |
US7800202B2 (en) | 2010-09-21 |
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