WO2004107452A1 - 半導体装置およびその製造方法 - Google Patents
半導体装置およびその製造方法 Download PDFInfo
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- WO2004107452A1 WO2004107452A1 PCT/JP2004/007872 JP2004007872W WO2004107452A1 WO 2004107452 A1 WO2004107452 A1 WO 2004107452A1 JP 2004007872 W JP2004007872 W JP 2004007872W WO 2004107452 A1 WO2004107452 A1 WO 2004107452A1
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- semiconductor
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- semiconductor device
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 212
- 238000004519 manufacturing process Methods 0.000 title claims description 38
- 238000000034 method Methods 0.000 title claims description 31
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 73
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- 229910052732 germanium Inorganic materials 0.000 claims description 26
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66787—Unipolar field-effect transistors with an insulated gate, i.e. MISFET with a gate at the side of the channel
- H01L29/66795—Unipolar field-effect transistors with an insulated gate, i.e. MISFET with a gate at the side of the channel with a horizontal current flow in a vertical sidewall of a semiconductor body, e.g. FinFET, MuGFET
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- 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
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/78684—Thin film transistors, i.e. transistors with a channel being at least partly a thin film having a semiconductor body comprising semiconductor materials of Group IV not being silicon, or alloys including an element of the group IV, e.g. Ge, SiN alloys, SiC alloys
- H01L29/78687—Thin film transistors, i.e. transistors with a channel being at least partly a thin film having a semiconductor body comprising semiconductor materials of Group IV not being silicon, or alloys including an element of the group IV, e.g. Ge, SiN alloys, SiC alloys with a multilayer structure or superlattice structure
Definitions
- the present invention relates to a semiconductor device and a method for manufacturing the same, and more particularly, to a semiconductor device including a fin FET including a semiconductor layer having lattice distortion and a method for manufacturing the same.
- MOSFET Technology ", International Electron Device Meeting (IEDM) 2002, P23-26), FinFET (Fin Field Effect transistor (tri-gate)), and devices with a three-dimensional channel structure called double gate (for example, Japanese Patent No. 2768719) has been proposed.
- Silicon and germanium have a higher carrier (hole) mobility than silicon. For this reason, when used for the p-type channel of a field effect transistor, high speed can be realized.
- strained silicon has both higher electron and hole mobilities than silicon without lattice distortion. Therefore, the performance can be improved by using both the n-type and p-type channels of the field-effect transistor, and a further increase in the speed can be realized irrespective of miniaturization.
- conventional transistors have short-circuits. It is becoming very difficult to suppress the tunneling effect.
- the short channel effect becomes remarkable when the drain has more control over the channel than the gate (specifically, a depletion layer extending from the drain affects the formation of the channel).
- a transistor called a fin FET or a double gate transistor has three-dimensionally surrounded the channel with a gate so that the gate has more power over the channel. It has such a structure. Therefore, the gate voltage is applied to the channel from at least two directions, and the short channel effect can be effectively suppressed.
- the channel area covered by the gate is twice or three times larger for the same device area, increasing the current driving capability.
- the channel is formed of conventional silicon, and the challenge of improving the driving force remains in terms of carrier mobility degradation.
- An object of the present invention is to provide a semiconductor device having a high current driving force even at a low voltage and suitable for miniaturization, and a method for manufacturing the same.
- a semiconductor device includes: a first insulating layer; a first main body made of an island-shaped semiconductor formed on the first insulating layer; A second body formed of an island-shaped semiconductor formed on an insulating layer; and a second body formed on the first insulating layer so as to connect the first body and the second body.
- the semiconductor forming the channel region has lattice distortion.
- the semiconductor layer forming the channel region has lattice distortion, a channel having high carrier mobility is formed, and current driving is improved.
- the gate electrode is formed so as to three-dimensionally cover the ridge-shaped channel region having lattice distortion, the dominance of the gate to the channel is increased, and the short channel resistance is improved.
- the rise of the current-voltage characteristic becomes steep, and a higher current value can be obtained with a small voltage. That is, it is possible to obtain a semiconductor device which has a high current driving force even at a low voltage and is resistant to miniaturization.
- the semiconductor that forms the channel region includes a first semiconductor and a second semiconductor that has a smaller lattice constant than the first semiconductor that is heterojunctioned with the first semiconductor, and the second semiconductor is It may have lattice distortion.
- the first semiconductor may be silicon-germanium
- the second semiconductor may be silicon.
- the second semiconductor preferably has a lattice strain of 0.8% or more and 5.0% or less.
- the lattice distortion of the second semiconductor is 1.6% or more and 4.2% or less.
- a first relaxed semiconductor layer made of the first semiconductor lattice-relaxed is formed on the first insulating layer, and the second semiconductor is epitaxially grown on side surfaces and an upper surface of the first relaxed semiconductor layer.
- the formed first strained semiconductor layer may be formed. It is preferable that the concentration of germanium in the first semiconductor be 10% or more and 60% or less.
- the concentration of germanium in the first semiconductor is not less than 20% and not more than 50%.
- a second relaxed semiconductor layer composed of the second semiconductor lattice-relaxed on the first insulating layer, and epitaxially growing the first semiconductor on the second relaxed semiconductor layer;
- a second strained semiconductor layer is formed, and a second strain is formed by epitaxially growing the second semiconductor on the side surface and the top surface of the stacked body of the second relaxation semiconductor layer and the second strained semiconductor layer.
- a semiconductor layer may be formed.
- the germanium concentration in the second strained semiconductor layer is not less than 5% and not more than 15% when the channel formed in the channel region is n-type, and the channel formed in the channel region is not more than 15%. In the case of the p-type, it is preferably at least 5% and at most 30%.
- the connecting portion has a rectangular cross-sectional shape, and the ratio of the height to the width of the connecting portion is 1 or more and 100 or less when the channel formed in the channel region is n-type.
- the number is preferably 1 or more and 100 or less.
- the ratio of the height to the width of the connection portion is 1.1 or more and 30.45 or less when a channel formed in the channel region is an n-type, and is formed in the channel region.
- the channel is P-type, it is more preferably 1.15 or more and 25.45 or less.
- the connecting portion may have a rectangular cross-sectional shape, and a side surface of the connecting portion may be a (100) plane.
- the method of manufacturing a semiconductor device may further include, on the first insulating layer, a first main body portion made of an island-shaped semiconductor, a second main body portion made of an island-shaped semiconductor, and the first main body.
- A forming a ridge-shaped connection part connecting the part and the second main body part, and forming at least a part in the length direction of the connection part.
- Forming a source region so as to extend over a portion between the second body portion and the channel region; and a portion of the connection portion between the second body portion and the channel region.
- C forming a drain region so as to extend to the above.
- a semiconductor constituting the channel region is provided with lattice distortion.
- a channel semiconductor layer having a distortion on a three-dimensional structure can be formed, and a semiconductor device can be manufactured in which a gate having a high carrier mobility has a higher dominance of a gate.
- a semiconductor device which has a high current driving force even at a low voltage and is resistant to miniaturization.
- the semiconductor constituting the channel region may be composed of a first semiconductor and a second semiconductor having a smaller lattice constant than the first semiconductor.
- a first relaxed semiconductor layer composed of the first semiconductor lattice-relaxed is formed on the first insulating layer, and thereafter, a first relaxed semiconductor layer is formed on a side surface and an upper surface of the first relaxed semiconductor layer.
- the first strained semiconductor layer may be formed by epitaxially growing the second semiconductor.
- a second relaxation semiconductor layer made of the second semiconductor lattice-relaxed is formed on the first insulation layer, and thereafter, the second relaxation semiconductor layer is formed on the second relaxation semiconductor layer.
- Forming a second strained semiconductor layer by epitaxially growing the first semiconductor, and then forming the second semiconductor on a side surface and a top surface of a laminate of the second relaxation semiconductor layer and the second strained semiconductor layer. May be epitaxially grown to form a partially strained semiconductor layer.
- the first semiconductor may be silicon-germanium, and the second semiconductor may be silicon.
- an SGOI substrate is prepared, a buried oxide film of the SGOI substrate is used as the first insulating layer, and a silicon-germanium layer of the SGOI substrate is used as the first semiconductor layer. Is also good. This With such a configuration, a semiconductor device in which a part of the channel is made of strained silicon can be easily formed.
- a substrate is prepared by epitaxially growing a silicon germanium layer on a silicon layer of an SII substrate, and a buried oxide film, a silicon layer, and a silicon germanium layer of the substrate are formed. May be used as the first insulating layer, the second semiconductor layer, and the first semiconductor layer, respectively. With such a structure, the difficulty in manufacturing a semiconductor device in which part of a channel is formed of strained silicon can be reduced.
- FIG. 1 is a perspective view schematically showing a schematic configuration of the semiconductor device according to the first embodiment of the present invention.
- FIG. 2 is a plan view showing the configuration of the semiconductor device of FIG.
- 3A to 3C are a cross-sectional view taken along line II-II, a sectional view taken along line III-III, and a cross-sectional view taken along line IIIC-IIIC of FIG. 2, respectively.
- FIGS. 4A to 4C are diagrams showing steps in the method for manufacturing the semiconductor device of FIG. 1, wherein FIG. 4A is a plan view, FIG. 4B is a cross-sectional view taken along the line IVB-IVB of FIG. C is a cross-sectional view taken along the line IVC-IVC in FIG. 4A.
- FIG. 5A to 5C are views showing steps in the method for manufacturing the semiconductor device of FIG. 1, wherein FIG. 5A is a plan view, FIG. 5B is a cross-sectional view taken along line VB-VB of FIG. C is a sectional view taken along the line VC-VC in FIG. 5A.
- FIGS. 6A to 6C are diagrams showing steps in the method for manufacturing the semiconductor device of FIG. 1, wherein FIG. 6A is a plan view, FIG. 6B is a cross-sectional view taken along the line VIB-VIB of FIG. C is a sectional view taken along the line VIC-VIC in FIG. 6A.
- FIG. 7A to 7C are diagrams showing steps in the method for manufacturing the semiconductor device of FIG. 1, wherein FIG. 7A is a plan view, FIG. 7B is a cross-sectional view taken along the line VIIB-VIIB of FIG. C is a sectional view taken along the line VIIC-VIIC of FIG. 7A.
- 8A to 8C are diagrams showing steps in the method for manufacturing the semiconductor device of FIG. 1, wherein FIG. 8A is a plan view, FIG. 8B is a sectional view taken along the line VIIIB-VIIIB of FIG. 8C is a sectional view taken along the line VIIIC-VIIIC in FIG. 8A.
- FIG. 9 is a graph showing the gate voltage-drain current characteristics in comparison between the semiconductor device of the present embodiment and a conventional example.
- FIG. 10 is a plan view showing the configuration of the semiconductor device according to the second embodiment of the present invention.
- 11A to 11C are a sectional view taken along the line XIA-XIA, a sectional view taken along the line XIB-XIB, and a sectional view taken along the line XIC-XIC of FIG. 10, respectively.
- FIGS. 14A to 14C are diagrams showing steps in the method for manufacturing the semiconductor device of FIG. 11, in which FIG. 12A is a plan view, and FIG. 12B is ⁇ —XIIB of FIG. 12A.
- FIG. 12C is a sectional view taken along the line XIIC—XIIC of FIG. 12A.
- 13A to 13C are diagrams showing steps in the method for manufacturing the semiconductor device of FIG. 11, in which FIG. 13A is a plan view and FIG. 13B is a plan view of FIG. 13A.
- FIG. 13C is a sectional view taken along line XIIIC-XIIIC of FIG. 13A.
- FIGS. 14A to 14C are diagrams showing steps in the method for manufacturing the semiconductor device of FIG. 11, in which FIG.
- FIGS. 15A to 15C are diagrams showing steps in the method for manufacturing the semiconductor device of FIG. 11, where FIG. 15A is a plan view and FIG. 15B is XVB—XVB of FIG. 15A.
- FIG. 15C is a cross-sectional view taken along the line XVC—XVC of FIG. 15A.
- FIGS. 16A to 16C are diagrams showing steps in the method for manufacturing the semiconductor device of FIG. 11, in which FIG. 16A is a plan view, and FIG.
- FIG. 16B is XVIB—XVIB of FIG.
- FIG. 16C is a cross-sectional view taken along the line XVIC-XVIC of FIG. 16A.
- FIG. 17A is a schematic diagram illustrating a state of a crystal lattice in a fin portion of the semiconductor device according to the second embodiment.
- FIG. 17B is a schematic diagram showing a strain state of the crystal lattice in the strained Si Ge layer and the partially strained layer in FIG. 17A.
- FIG. 18 is a schematic diagram showing a strain state of the crystal lattice of the strained Si layer according to the first embodiment.
- Fig. 19A is a graph showing the dependence of the effective range of the width-to-height ratio of the fin part on the Ge concentration of the strained Si Ge layer in the n-channel FET.
- 11 is a graph showing the dependence of the effective range of the width-height ratio of the fin portion on the Ge concentration of the strained SiGe layer.
- FIG. 1 is a perspective view schematically showing a schematic configuration of the semiconductor device according to the first embodiment of the present invention.
- the semiconductor device of the present embodiment is configured by a fin FET, and includes, as main components, a source body (first body) 13 and a drain body (second body). It has a main body portion 14, a fin portion (connection portion) 15, a gate insulating film (second insulating layer) 17, and a gate electrode 18.
- a silicide layer, an interlayer insulating film, wiring, and the like is omitted.
- the source main body 13 and the drain main body 14 are formed in a rectangular parallelepiped shape, and are arranged on the substrate insulating layer 11 so as to face each other.
- a plurality (three in this case) of plate-like fins 15 are connected to the source body 13 and the drain body 14 so that both ends are connected to each other and spaced apart from each other.
- (1 insulating layer) 1 It stands on 1.
- a gate insulation 17 is formed so as to cover a side surface and an upper surface of a central portion (hereinafter, referred to as a channel region) 15a of each fin portion 15.
- the side surface and the upper surface of the channel region 15a of the three fin portions 15 are covered via the gate insulation 17, and the space between the three fin portions 15 is filled.
- a gate electrode 18 is formed on substrate insulating layer 11 so as to extend orthogonal to portion 15.
- the side of the gate electrode 18 is attached to the side wall 23 Covered.
- portions other than the portions connected to the fin portions 15 on the side surfaces of the source body portion 13 and the drain body portion 14 and portions not covered by the gate insulating film 17 on the side surfaces of the fin portion 15 are also included. Covered by side walls 23.
- Three contacts 27 are formed on the upper surfaces of the source body 13 and the drain body 14 so as to correspond to the fins 15 respectively.
- a contact 27 is also formed on the upper surface of the end of the gate electrode 18 in the gate width direction (a direction orthogonal to the fin 15).
- C FIG. 2 shows the configuration of the semiconductor device of FIG.
- 3A to 3C are a sectional view taken along the line III-III, a sectional view III-III, and a sectional view taken along the line IIIC-IIIC of FIG. 2, respectively.
- 3A to 3C are drawn by appropriately reducing or enlarging the dimensions in the horizontal direction (the direction parallel to the main surface of the substrate 101) with respect to the plan view of FIG.
- the semiconductor device of the present embodiment has a semiconductor substrate 101.
- the semiconductor substrate 101 is formed by forming a substrate insulating layer 11 (about 400 nm or less) made of an oxide film layer on a supporting substrate 10 made of silicon or the like.
- the substrate insulating layer 11 is located at the center (channel region) 15 a in the length direction of the fin portion 15 (the direction parallel to the main surface of the substrate 101).
- a lattice-relaxed silicon-germanium layer (hereinafter referred to as a relaxed SiGe layer) 12 is formed.
- the relaxed SiGe layer 12 is formed as a whole in the shape of a quadrangular prism extending vertically (in the thickness direction of the substrate 101).
- the germanium concentration of the relaxed SiGe layer 12 is preferably 10% or more and 60% or less, more preferably 20% or more and 50% or less.
- the height of the relaxed SiGe layer 12 is preferably about 30 nm or more and about 100 nm or less.
- a silicon layer (hereinafter, referred to as a strained Si layer) 16 having a tensile strain is formed so as to cover the side surfaces and the upper surface of the relaxed SiGe layer 12 in the shape of a quadrangular prism.
- the thickness of the strained Si layer 16 is approximately 5 nm or more and approximately 5 O nm or less Is preferred.
- the strain of the strained Si layer 16 is preferably 0.8% or more and 5.0% or less, more preferably 1.6% or more and 4.2% or less.
- the strain of the strain Si layer 16 is expressed as a percentage with respect to the lattice constant of Si.
- the source main body 13 and the drain main body 14 are composed of a relaxed SiGe layer and a strained Si layer formed simultaneously with the relaxed SiGe layer 12 and the strained Si layer 16 of the fin 15. It is composed of The portion of the fin portion 15 other than the channel region 15 a (hereinafter referred to as a non-channel region) also includes the relaxed SiG layer formed simultaneously with the relaxed SiGe layer 12 and the strained Si layer 16. An e layer and a strain Si layer are configured.
- the relaxed Si Ge layer and the strained Si layer are a degenerated silicon-germanium layer and a silicon layer, respectively.
- the portion of the non-channel region of the source body 13 and the non-channel region of the fin 15 connected to the source body 13 constitutes the source region 2, and the non-channel region of the drain body 14 and the fin 15 The portion connected to the drain main body 14 constitutes the drain region 25.
- the gate insulating film 17 covers the strained Si layer 16 of the channel region 15 a and the portions of the non-channel region located on both sides of the strained Si layer 16 in the fin portion 15. It is formed as follows.
- the gate insulating film 17 is formed of, for example, an oxynitride film (thickness: about 1 to 5 nm) or a HfO 2 film (thickness: about 30 nm or less) which is a high dielectric constant insulating film.
- the gate electrode 18 is formed on the gate insulating film 17 so as to be located above the strained Si layer 16 in the fin portion 15.
- the thickness of the gate electrode 18 is about 50 to 150 nm.
- the gate electrode 18 is made of, for example, degenerated polysilicon or polysilicon germanium into which a high-concentration dopant is introduced. With the above configuration, as shown in FIG. 3A, in use, a channel is formed by both sides 19 of the fin portion 15 and the strained Si layer 16 located on the upper portion 20. You.
- the width 21 of the fin portion 15 is preferably in the range of about 15 nm or more and 10 O nm, and is desirably completely depleted by an applied gate voltage.
- the width of the strained Si layer 16 (the width of the fin portion 15) 21 is set so that 1 Z 2 of 1 1 is not more than about 1-3 of the gate length L (see FIG. 3B). by this c it is desirable to set the size of the Fi emission portion 1 5 and gate one gate electrode 1 8, increased dominance of pairs in the channel of the gate one G voltage applied to gate one gate electrode 1 8, short The channel effect can be suppressed.
- a silicide film 22 is formed using, for example, Co or Ni.
- the side wall 23 is formed on the gate insulating layer 17 so as to cover both side surfaces of the gate electrode 18 at the fin portion 15. Further, as described above, the side wall 23 is formed by the side surface of the gate electrode 18, the specific portion of the side surface of the source main body 13 and the drain main body 14, and the specific portion of the side surface of the fin portion 15. Therefore, the silicide film 22 can be formed in a self-aligned manner.
- the kind of dopant impurities introduced into the gate electrode 18, the source region 24, and the drain region 25 is, for example, phosphorus (P) or arsenic (As) in an n-channel FET, and, for example, in a p-channel FET. Boron (B) is used.
- the concentration of the dopant introduced into the source region 24 and the drain region 25 is approximately the same as the concentration in the depth direction (the thickness direction of the substrate 101) up to the interface with the substrate insulating layer 11. it is desirable to introduce so as to be kept at a concentration (l X 1 0 1 9 c m_ 3 or more). As a result, the distance between the channel formed not only on the upper portion 20 of the fin portion 15 but also on both side portions 19 and the source region 24 and the drain region 25 is reduced, so that the parasitic resistance is reduced.
- the concentration of the dopant introduced into the gate electrode 18 in the portion located between the fin portions 15 is different from that of the substrate insulating layer 11 in the depth direction (the thickness direction of the substrate 101). It is desirable to introduce so that the same high concentration (1 ⁇ 10 19 cm- 3 or more) can be maintained up to the interface. As a result, the gate voltage can be uniformly applied to the entire side portion 19 of the fin portion 15, and a channel can be reliably formed also in the portion of the side portion 19 near the substrate insulating layer 11. Can be
- the substrate 101 includes a source electrode main body 13, a drain main body 14, a fin 15, a gate insulating film 17, covered with a silicide film 22 and a side wall 23.
- Interlayer insulating film 26 is formed to cover gate electrode 18.
- a contact hole penetrates from the surface of the interlayer insulating film 26 and reaches the silicide film 22 on the source body 13, the drain body 14, and the gate electrode 18.
- a contact 27 is formed by embedding this contact hole with a metal plug such as W.
- a metal wiring 28 made of A1, Cu, or the like is formed on the surface of the interlayer insulating film 26 so as to be connected to the upper end of the contact 27.
- a voltage can be independently applied to the gate electrode 18, the source region 24, and the drain electrode 25 via the metal wiring 28 and the contact 27, respectively.
- FIG. 4A to 8C are diagrams showing steps in a method for manufacturing the semiconductor device of FIG.
- FIG. 4A is a plan view
- FIG. 4B is a sectional view taken along the line IVB—IVB in FIG. 4A
- FIG. 4C is a sectional view taken along the line IVC—IVC in FIG. 4A
- FIG. 5A is a plan view
- FIG. B is a sectional view taken along the line VB—VB in FIG. 5A
- FIG. 5C is a sectional view taken along the line VC—VC in FIG. 5A
- FIG. 6A is a plan view
- FIG. 6B is a sectional view taken along the line VIB—VIB in FIG.
- Figure 6C is Figure 6 872
- FIG. 7A is a plan view
- Fig. 7B is VIIB-VIIB cross section of Fig. 7A
- Fig. 7 C is VIIC-VIIC cross section of Fig. 7 ⁇
- Fig. 8A is FIG. 8B is a sectional view taken along the line VIIIB-VIIIB of FIG. 8A
- FIG. 8C is a sectional view taken along the line VIIIC-VIIIC of FIG. 8A.
- a semiconductor substrate 101 is prepared.
- the semiconductor substrate 101 for example, a silicon layer 10 (supporting substrate), a buried oxide film (substrate insulating layer (thickness: about 400 nm or less)), and a lattice relaxation formed on the buried oxide film
- An SGII substrate Silicon Germanium on insulator composed of a silicon-germanium layer 12 '(germanium concentration 10-50%, thickness approx. 30-: LOO nm) is used.
- an element region is defined. Specifically, dry etching is performed on the silicon-germanium layer 12 'lattice-relaxed using a patterned resist mask or a silicon oxide film deposited by plasma CVD (Chemical Vapor Deposition) as a hard mask.
- plasma CVD Chemical Vapor Deposition
- a rectangular parallelepiped part (hereinafter referred to as a relaxed Si Ge source main body) 1 2 ′ a that eventually becomes the source body 13, and a rectangular parallelepiped part (hereinafter referred to as the drain body 14) 1 2 'b, which is the relaxed Si Ge drain body, and 3 2' c, which are three plate-like portions that eventually become the fins 15 (hereinafter, the relaxed Si Ge fins) To achieve.
- the relaxed S i Ge source body 1 2 ′ a and the relaxed S i Ge drain body 12 2 ′ b are formed so as to face each other, and the three relaxed S i Ge fin sections 1 2 'c is formed so as to connect the relaxed SiGe source body 12'a and the relaxed SiGe drain body 12'b.
- an element region is defined on the substrate 101.
- a silicon film is formed on the entire surface of the element region defined above by using a UHV-CVD (Ultra High Vacuum-Chemical Vapor Deposition) method.
- UHV-CVD Ultra High Vacuum-Chemical Vapor Deposition
- a film 16 ' is formed to a thickness of about 10 to 50 nm.
- the upper and side surfaces of the relaxed SiGe source body 12'a, the relaxed SiGe drain body 12'b, and the three relaxed SiGe fin portions 12 and c are distorted.
- a silicon film 16 ' is formed.
- the source body 13 is formed by the relaxed Si Ge source body 12 ′ a and the strained silicon film 16 ′ formed on the upper and side surfaces thereof, and the relaxed Si Ge drain body 1 is formed.
- the drain body 14 was formed by 2 ′ b and the strained silicon film 16 ′ formed on the top and side surfaces, and the relaxed Si Ge fin portion 12 ′ c was formed on the top and side surfaces.
- the fin portion 15 is formed with the strained silicon film 16 ′.
- a conductive film that will eventually become the gate electrode 18 is formed on the silicon oxide film 17 ′.
- a polysilicon film is formed over the entire surface of the semiconductor substrate 101 on which the silicon oxide film 17 ′ is formed to a thickness of 50 to 20 O nm by LP—CVD (Low Pressure-Chemical Vapor Deposition). formed, after the introduction of the dopant impurity to a high concentration of 5 X 1 0 1 9 cm one 3 or more by ion implantation or the like, a short time 8 0 0 ° C ⁇ 1 0 0 0 ° C, in a nitrogen atmosphere intention A rapid heat treatment is performed to activate the dopant impurities.
- LP—CVD Low Pressure-Chemical Vapor Deposition
- Electrodes 18 are formed.
- the gate electrode 18 is securely buried between the fin portions 15 so as to reach the substrate insulating layer 11 as shown in FIG. 7B. This is to prevent the polysilicon residue from remaining on the side surfaces of the source body 13 and the drain body 14 after the dry etching.
- dry etching of polysilicon after performing main etching under strongly anisotropic etching conditions, over-etching is performed under strongly isotropic etching conditions, and the source body 13 and the drain body 14 are etched. It is also effective to prevent the polysilicon from remaining in the shape of a sidewall on the side surface.
- a side wall 23 made of a silicon oxide film or the like is attached to the side surface of the gate electrode 18, the source body 13 and the drain body. It is formed so as to cover a specific part of the side surface of the part 14 and a specific part of the side surface of the fin part 15, and thereafter, the source body part 13 and the drain body part 14 and the non-channel of the fin part 15 are formed.
- the source region 24 and the drain region 25 are formed by ion-implanting a dopant impurity into the region and performing rapid thermal treatment.
- the relaxed SiGe layer 12 and the strained Si layer 16 are formed in the channel region 15a of the fin portion 15.
- a silicide film 22 is formed on the upper surfaces of the gate electrode 18, the source region 24 and the drain region 25 by using Co or Ni or the like.
- an interlayer insulating film 26 made of a silicon oxide film or the like is formed on the entire surface of the substrate 101 on which the silicide film 22 is formed, and this is formed.
- CMP Chemical Mechanical Polishing
- a contact 27 made of a metal plug such as W penetrating through the interlayer insulating film 26 is formed, and then the contact 27 is formed on the surface of the interlayer insulating film 26.
- a metal wiring 28 made of Cu or A1 is formed so as to be connected to the upper end of the cut 27.
- the fin FET is completed.
- the ion implantation into the source region 24 and the drain region 25 is performed at a high impurity concentration of 5 ⁇ 10 19 cm ⁇ 3 or more in the depth direction of the source region 24 and the drain region 25.
- the injection energy so that It is desirable to adjust.
- FIG. 9 is a graph showing the gate voltage-drain current characteristics comparing the semiconductor device of the present embodiment with a conventional example.
- the semiconductor device of the present embodiment since the semiconductor layer on which the channel is formed is composed of the strained Si layer 16, the high carrier mobility causes the conventional semiconductor device to have a structure as shown in FIG. The current driving force is improved as compared with the example.
- the germanium concentration of the relaxed Si Ge layer 12 is about 30%
- the strained silicon 16 formed thereon has a larger thickness than the conventional strain-free Si layer.
- about 60 to 80% it can be expected that the effective mobility of electrons will improve.
- the gate electrode 18 surrounds the three-dimensional channel structure composed of the strained Si layer 16 formed on the upper part 20 and the side part 19 of the fin part 15. Therefore, the dominance of the gate electrode 18 with respect to the channel is improved, whereby a high current driving force can be obtained even at a low voltage, and the short channel effect is suppressed. This makes the device suitable for miniaturization.
- FIGS. 4A to 8C a semiconductor device according to a first embodiment and a method of manufacturing the same will be described with reference to FIGS. 4A to 8C.
- a semiconductor substrate 101 is prepared. Silicon layer 10, buried oxide film (substrate insulating layer: (thickness: about 400 nm or less)) as semiconductor substrate 101, and lattice formed on buried oxide film Use a SGOI substrate (Silicon Germanium on Insulator) composed of relaxed silicon 'germanium layer 12' (germanium concentration 30%, thickness 100nm) 9 o.
- SGOI substrate Silicon Germanium on Insulator
- an element region is defined. Specifically, a silicon oxide film deposited over the entire surface of the substrate at about 600 ° C using plasma CVD (Chemical Vapor Deposition) is patterned by dry etching using a resist mask to form a hard mask. .
- the mask can be prepared in a large size in advance, and can be adjusted to a size smaller than the exposure limit by etching with dilute hydrofluoric acid whose etching rate is well controlled.
- Dry etching is performed on 1 2 ′, and the relaxed Si Ge source body 1 2 ′ a, the relaxed Si Ge drain body 1 2 ′, and the relaxed Si Ge fin section (width of about 3 0 nm) 1 2 and c.
- the relaxed S i Ge source body 1 2 ′ a and the relaxed S i Ge drain body 12 2 ′ b are formed to face each other, and the three relaxed S i Ge fin sections 1 2 ′ c is the relaxation S
- wet etching with hydrofluoric acid is performed to remove all the etching masks, and then the surface of the substrate 101 is cleaned by performing wafer cleaning.
- a silicon film is epitaxially grown at a temperature of 600 on the entire surface of the element region defined as above by using the UHV-CVD method.
- a strained silicon film 16 ′ having tensile strain is formed to a thickness of about 15 nm.
- the source body 13 is formed by the relaxed Si Ge source body 12 ′ a and the strained silicon film 16 ′ formed on the upper and side surfaces thereof, and the relaxed Si Ge drain body is formed.
- Drain body 14 was formed by 1 2 ′ b and strained silicon film 16 ′ formed on the upper and side surfaces thereof, and relaxed Si Ge fin portion 12 ′ c was formed on the upper surface and side surfaces thereof.
- the fin portion 15 is formed with the strained silicon film 16 ′.
- rapid thermal oxidation is performed for a short time at a temperature of about 850 ° C. over the entire surface of the strained silicon film 16 ′, and a silicon oxide film 17 ′ is formed. Is formed to a thickness of 2 nm.
- a polysilicon film that will eventually become the gate electrode 18 is formed to a thickness of 15 O nm by LP-CVD, and ion implantation of phosphorus (P +) ( l O ke V or so, by performing a dose 4 X 1 0 1 9 c m_ about 3), we introduce phosphorus ions at a high concentration of 1 X 1 0 1 9 c m_ 3 or more.
- the silicon oxide film deposited by the plasma CVD method is patterned by performing dry etching using a resist as a mask, and a hard mask of the silicon oxide film is formed on the polysilicon film.
- a gate electrode 18 gate length of about 90 nm formed of the degenerated polysilicon layer is obtained.
- the gate electrode 18 must be formed so as to be completely buried up to the substrate insulating layer (buried oxide film) 11, and that the polyelectrode 18 after the dry etching.
- the purpose is to prevent silicon residue from being present on the side surfaces of the source main body 13 and the drain main body 14.
- the main etching is performed under highly anisotropic etching conditions, the end of the polysilicon film is detected, and then the gas pressure in the chamber is set higher than the main etching conditions. Over etching is performed under strongly anisotropic etching conditions, and the source body 13 and 7872
- CMOS process For the subsequent steps, it is possible to use a general CMOS process. As shown in FIGS. 8A to 8C, after the silicon oxide film is deposited, the whole surface is etched back to form a side wall 23 (side wall width about 50 nm). Then, using a resist pattern as a mask, arsenic ions (As +) are implanted at a dose of about 4 ⁇ 10 15 cm— 2 at about 35 keV, and the resist mask is completely removed. Approximately 15 seconds at CC, activates phosphorus in gate electrode 18 and arsenic in source region 24 and drain region 25 by performing rapid heat treatment in a nitrogen atmosphere, and degenerates to high concentration. The gate electrode 18, the source region 24 and the drain region 24 are formed.
- the impurity concentration in the source and drain regions 2 is set so as to be almost uniform at a high concentration of 5 ⁇ 10 19 cm ⁇ 3 or more. 4, 25 are formed.
- a Co film was deposited to a thickness of about 15 nm on the entire surface by sputtering, and the gate electrode 18 and the gate electrode 18 were formed by a rapid thermal treatment (about 500 ° C, about 30 seconds) in the first nitrogen atmosphere.
- C o Shirisai de film (C o 2 S i or C o S i) form the above, completely unnecessary C o film deposited on the oxide film by performing a washing t Then during the second nitrogen atmosphere to be removed, rapid thermal processing (about 8 5 0 ° (:, 3 0 seconds to) a lower resistance at C o Shirisai de film 2 2 (C o 2 S i) of the gate It is formed only on the electrode 18 and the source and drain regions 24 and 25. Next, as shown in Fig. 2 and Figs. It is formed over the entire surface of the substrate to a thickness of 100 nm, and flattened by CMP.
- a contact hole is formed in the interlayer insulating film 26 by dry etching, a tungsten (W) metal plug 27 is buried, and a CU or A1 metal wiring 28 is formed thereon, and a gate electrode is formed.
- W tungsten
- 18 and source region 24 and drain region 25 Complete n-channel type FET.
- a channel is formed in the strained silicon layer 16
- the effective mobility of electrons is increased, and the current driving force is improved.
- a three-dimensional channel structure composed of a strained silicon layer 16 formed on the upper surface and side surfaces of the lattice-relaxed silicon and germanium layer 12 is surrounded by a gate electrode 18.
- the enhanced gate dominance provides high current driving capability even at low voltages and can suppress the short channel effect, making it a device suitable for miniaturization.
- the structure and the manufacturing method of the n-channel FET are shown in the first embodiment, the structure and the manufacturing method of the p-channel FET can be similarly obtained by reversing the polarity of the dopant impurity. Further, a complementary FET can be obtained using the n-channel FET and the p-channel FET. (Second embodiment)
- FIG. 10 is a plan view showing a configuration of a semiconductor device according to a second embodiment of the present invention.
- FIGS. 11A to 11C are cross-sectional views taken along the line XIA—XIA of FIG. 10, respectively, and XIB—XIB. 1 is a sectional view taken along a line, and FIG. 11A to 11C are drawn by appropriately reducing or enlarging the dimensions in the horizontal direction (the direction parallel to the main surface of the substrate 101) with respect to the plan view of FIG. ing.
- the same reference numerals as those in FIGS. 2 and 3A to 3C denote the same or corresponding parts.
- the first point is that the relaxed Si Ge layer 12 of the first embodiment 1 is formed on a silicon layer having no strain (hereinafter, referred to as a relaxed Si layer) 33 and on the relaxed Si layer 33.
- the point is that it is replaced by the formed strained silicon germanium layer (hereinafter referred to as strained SiGe layer) 30.
- the second point is that the strained Si layer 16 of the second embodiment is formed on a portion 31b formed on the side surface of the strained SiGe layer 30. Only the silicon layer having distortion (hereinafter, referred to as a partially strained Si layer) 31 is replaced.
- the other points are the same as in the first embodiment.
- a relaxed Si layer 33 is formed on the substrate insulating layer 11 so as to be located in the channel region 15a, and a strain is formed on the relaxed Si layer 33.
- the S i Ge layer 30 is formed.
- the laminated body composed of the relaxed Si layer 33 and the strained SiGe layer 30 is formed in a quadrangular prism shape extending vertically as a whole.
- the height of the laminated body composed of the relaxed Si layer 33 and the strained SiGe layer 30 is preferably about 30 nm or more and about 100 nm or less.
- a partially strained Si layer 31 is formed so as to cover the side surface and the upper surface of the laminated body including the quadrangular prismatic relaxed Si layer 33 and the strained SiGe layer 30.
- the thickness of the partially strained Si layer 31 is preferably about 5 nm or more and about 5 O nm or less.
- the partially strained Si layer 31 is formed on the upper surface of the strained SiGe layer 30 and has a first relaxation portion 31a having no strain, and formed on the side surface of the strained SiGe layer 30 and pulled. It comprises a strained portion 31 b having strain and a second relaxed portion 31 c formed on the side surface of the relaxed Si layer 33 and having no strain.
- the strain of the strain portion 31b of the partial strain Si layer 31 is preferably 0.8% or more and 5.0% or less, more preferably 1.6% or more and 4.2% or less.
- the distortion of the distortion part 31b is expressed as a percentage of the lattice constant of Si.
- the source body 13 and the drain body 14 were formed simultaneously with the relaxed Si layer 33, the strain Si Ge layer 30 and the partial strain Si layer 31 of the fin 15 respectively. It is composed of a relaxed Si layer, a strained SiGe layer, and a partially strained Silayer.
- the non-channel region of the fin portion 15 also has the relaxation formed simultaneously with the relaxation Si layer 33, the strain Si Ge layer 30 and the partial strain Si layer 31 of the channel region 15a. It is composed of a Si layer, a strained SiGe layer, and a partially strained Si layer.
- the high-concentration dopant impurities are introduced into the layer 31, the strain 31, the strain 310 layer, and the partial strain Si layer, and the relaxation 31 layer, the strain 3
- the 1 & 6 layers and the partially strained Si layer are degenerated silicon layers or silicon-germanium layers.
- the source body 13 and the portion of the non-channel region of the fin 15 connected to the source body 13 constitute the source region 24, and the drain body 14 and the fin 15
- the portion of the non-channel region connected to the drain body 14 constitutes the drain region 25.
- the preferred plane orientation of the side surface of the fin portion 15 is the same as in the first embodiment.
- a preferred range (hereinafter, referred to as an effective range) of a ratio of the height to the width of the fin portion 15 (hereinafter, referred to as a width-height ratio) will be described with reference to FIGS. 19A and 19B.
- Fig. 19A is a graph showing the dependence of the effective range of the fin width-to-height ratio on the Ge concentration of the strained Si Ge layer in an n-channel FET.
- 11 is a graph showing the dependence of the effective range of the width-height ratio of the fin portion on the Ge concentration of the strained SiGe layer.
- the horizontal axis represents the Ge concentration of the strained Si Ge layer 30, and the vertical axis represents the width-to-height ratio and the performance ratio.
- the performance ratio represents the ratio of the carrier mobility (average value) of the FET of the second embodiment to the carrier mobility (average value) of the FET of the first embodiment.
- the plot represented by the X mark represents the upper limit of the effective range of the strain SiGe layer 30. Specifically, it shows the upper limit of the width-to-height ratio, which is restricted by the critical film thickness of the strained SiGe layer 30. Note that the lower limit of the effective range of the strain S i Ge layer 30 is “1”, although not indicated by a specific mark.
- the plots represented by the black and white rectangles indicate the preferred upper and lower limits of the effective width-to-height ratio range, respectively.
- the plots represented by black circles indicate the performance ratios.
- the effective range of the width-to-height ratio is the Ge concentration of the strain Si Ge layer 30 and the polarity of the channel (n-channel type or p-channel type). Or).
- the lower limit of the preferable range of the Ge concentration of the strained Si layer is 5%. If it is less than 5%, a strain that sufficiently improves the carrier mobility cannot be generated in the partially strained Si layer 31.
- the upper limit of the preferable range of the Ge concentration of the strained Si layer is 15%. If it exceeds 15%, it is difficult to improve the performance ratio by increasing the width-to-height ratio due to the critical thickness of the strained SiGe layer 31. .
- the effective range of the width-height ratio is a range defined by curves showing the upper and lower limits in the range of 5% to 15% of the Ge concentration of the strained SiGe layer 30.
- the curves showing the upper limit of the width-to-height ratio show that the width-height ratio is 100.0.00, 30.45, and 17 at Ge concentrations of 5%, 10%, and 15%, respectively. It is represented by a curve connecting the points that are 95 (X mark).
- the curve showing the lower limit of the width-height ratio is a straight line with a width-height ratio of 1.0 at Ge concentrations of 5%, 10%, and 15%.
- a more preferable range of the effective width-to-height ratio range is defined by curves indicating the upper and lower limits in a range of 5% to 15% of the Ge concentration of the strained SiGe layer 30. Range (diagonally shaded area).
- the curves showing the more preferable upper limit of the width-to-height ratio show that the width-to-height ratio is 30.45, 15.4 at the Ge concentration of 5%, 10%, and 15%, respectively. It is represented by a curve that connects the points (5, 14.95) (black rectangular marks).
- the curves showing the more preferable lower limit of the width-to-height ratio show that the width-height ratio is 1.10, 2.10 at Ge concentration of 5%, 10%, and 15%, respectively. It is represented by a curve connecting points 95, 5.95 (white rectangular marks). In this range, the performance ratio is larger than 1.
- the preferred range of the Ge concentration in the strained Si layer is The lower limit of the box is 5% and the upper limit is 30%. The grounds for the lower and upper limits are the same as for the n-channel FET.
- the effective range of the width-to-height ratio is a range defined by curves indicating the upper and lower limits in a range of 5% to 30% of the & 6 concentration of the strain S106 layer 30.
- the curves showing the upper limit of the width-to-height ratio are as follows: Ge concentration 5%, 10%,
- a more preferable range of the effective width-to-height ratio range is defined by curves indicating the upper and lower limits in a range of 5% to 15% of the Ge concentration of the strained SiGe layer 30. Range (diagonally shaded area).
- the curves showing the more preferable upper limit of the width-to-height ratio show that the width-height ratio is 10.45, 2 at the Ge concentration of 5%, 10%, 20%, and 30%, respectively. It is represented by a curve connecting the points that are 5.45, 5.95, and 3.00 (black rectangular marks).
- the curves showing the more preferable lower limit of the width-height ratio are as follows: Ge concentration 5%, 10%, 20%,
- the basis for the limit of the effective range of the width-to-height ratio for n-channel FETs and p-channel FETs is that if the lower limit is exceeded, the gate dominance weakens, making it difficult to suppress the short-channel effect. If the upper limit is exceeded, the thickness of the strained Si layer 30 reaches a critical value, which is relaxed to form a defect and a leak current is generated. Because.
- the basis of the limit value of the more preferable range of the effective range of the width-height ratio is that, if the limit value is not less than the lower limit, the strain of the partial strain layer 31 formed on the side surface of the strain SiGe layer 30 is considered. Part (the lattice distortion is about twice that of the first embodiment) This is because the ratio of 31b increases and the performance ratio becomes higher than 1. If the ratio is less than the upper limit, a performance ratio of 1 or more is obtained, and the workability and heat resistance during the fabrication of the FET are reduced. Because it improves.
- FIGS. 12A to 16C are diagrams illustrating steps in the method for manufacturing the semiconductor device of FIG. 11.
- Figure 12A is a plan view
- Figure 12B is a cross-sectional view of the XIIB-XIIB line of Figure 12A
- Figure 12C is a cross-sectional view of the XIIC-XIIC line of Figure 12A
- Figure 13A is Plan view
- Figure 13B is a cross-sectional view taken along the line ⁇ — ⁇ of Figure 13A
- Figure 13C is a cross-sectional view taken along the line XIIIC—XIIIC of Figure 13A
- Figure 14A is a plan view
- Figure 14B is a plan view.
- FIGS. 12A to 16C the same reference numerals as those in FIGS. 4A to 8C denote the same or corresponding parts.
- a buried oxide film 11 (thickness of about 40 O nm or less) is formed on a silicon layer 10.
- a silicon layer 33 '(thickness of about 20 nm or less) and a strained silicon-germanium layer 30' with lattice distortion (germanium concentration of 10 to 50%, thickness of about 20 to 100 nm)
- This semiconductor substrate 101 can be manufactured as follows.
- a conventional SOI substrate is subjected to thermal oxidation and wet etching using diluted hydrofluoric acid to form a silicon layer 33 'on the surface with a desired film thickness (about 2 O nm or less). Adjust so that
- the SII substrate is washed, and then a silicon-germanium layer (a germanium concentration of 10 to 50% and a thickness of about 20 to: L00 nm) is siliconized. Epitaxy grows on the cone layer 3 3 '.
- a semiconductor substrate 101 having a silicon-germanium layer 30 ′ having a compressive strain in a direction parallel to the main surface thereof and a tensile strain in a direction perpendicular to the thickness direction can be obtained.
- an element region is defined. Specifically, using a patterned resist mask or a silicon oxide film deposited by a plasma CVD (Chemical Vapor Deposition) method or the like as a hard mask, the silicon layer 33 'and the silicon' germanium layer 33 ' Is dry-etched to obtain a rectangular parallelepiped part that will eventually become the source body part 13 (hereinafter referred to as relaxed S i Z strain S i Ge source body part) 3 3 a, 30 a a, A rectangular parallelepiped portion that will eventually become the drain body 14 (hereinafter referred to as the relaxed S i / strain S i Ge drain body) 33 ′ b, 30 ′ b and finally the fin 1 Three plate-like portions (hereinafter, referred to as relaxed S i / strain S i Ge fin portions) which are 5, 33 ′ c and 30 ′ c are formed.
- relaxed S i / strain S i Ge fin portions Three plate-like portions (hereinafter, referred to as relaxed S
- the relaxed S i Z strain S i Ge source body 33 3 ′ a, 30, a and the relaxed S i Z strain S i Ge drain body 33, b, 30 ′ b The three relaxed S i Z strain S i Ge fins 33, c, 30, and c are formed so as to face each other, and the relaxed S i Z strain S i Ge source body 33, a, 30 are formed.
- an element region is defined on the substrate 101.
- a silicon film is formed on the entire surface of the element region defined above by using the UHV-CVD (Ultra High Vacuum-Chemical Vapor Deposition) method.
- UHV-CVD Ultra High Vacuum-Chemical Vapor Deposition
- a partially strained silicon film 31 ′ having a partial tensile strain is formed to a thickness of about 10 to 50 nm.
- the relaxed S i / strain S i Ge source body 33 ′ a, 30 ′ a, and the relaxed S i Z strain S i Ge drain body 33 ′ b, 30 ′ b, and 3 ′ Horn A partially strained silicon film 31 is formed on the upper surface and side surfaces of the relaxed SiZ strain SiGe fin portions 33'c, 30 and c.
- the source body portion 13 is formed by the relaxed S i Z strain S 106 source body portion 33, a, 30'a and the partially strained silicon film 31 'formed on the upper surface and side surfaces thereof.
- the drain body 14 is formed by the relaxation S i strain S i Ge drain body 33 3 ′ b, 30 ′ b and the strained silicon film 31 ′ formed on the top and side surfaces thereof.
- the fin portion 15 is formed by the i / strain S i Ge fin portions 33 ′ c, 30 ′ c and the strained silicon film 31 ′ formed on the upper and side surfaces thereof.
- the partially strained silicon layer 31 ' is formed on the upper surface of the strained silicon' germanium layer 30 'and has no strain 31a' and the side surface of the silicon-germanium layer 30 '. It has a portion 31'b formed on the side of the silicon layer 33 'having no tensile strain and a portion 31'c formed on the side surface of the silicon layer 33' having no strain.
- the silicon-germanium layer 30 ′ undergoes lattice relaxation due to the high-temperature heat treatment, it is necessary to pay attention to the temperatures in the subsequent steps. For example, it is desirable to perform the heat treatment using a normal furnace at a temperature of 850 ° C or less, and to perform a rapid heat treatment at a temperature of 100 ° C or less for as short a time as possible.
- FIG. 11A the operation and effect of the semiconductor device configured as described above will be described with reference to FIGS. 11A, 17A, 17B, and 18.
- FIG. 11A the operation and effect of the semiconductor device configured as described above will be described with reference to FIGS. 11A, 17A, 17B, and 18.
- FIG. 17A is a schematic diagram showing a state of a crystal lattice in a fin portion of the semiconductor device according to the second embodiment
- FIG. 17B is a diagram showing crystals in the strained Si Ge layer and the partially strained layer in FIG. 17A.
- FIG. 18 is a schematic diagram showing a state of lattice distortion of the crystal lattice in the strained Si layer according to the first embodiment.
- the partial strain Si layer 31 is formed on the side surface of the strain Si Ge layer 30 ( Distorted portion) Only 31b has lattice distortion. Therefore, the carrier mobility is improved only in the distorted portion 3 lb. This is for the following reasons.
- the strain S i Ge layer 30 formed on the relaxed Si layer 33 matches the lattice constant of the relaxed Si layer 33 in the direction 34 parallel to the main surface of the substrate 101. As described above, the lattice constant is long so as to have a tensile strain in the direction 35 perpendicular to the main surface of the substrate 101 because of being formed by compressive strain.
- the strain portion 31b of the partial strain Si layer 31 is oriented in a direction 3 perpendicular to the main surface of the substrate 101 so as to match the lattice constant of the elongated strain SiGe layer 30.
- the portion 31a formed on the upper surface of the strained SiGe layer 30 of the partially strained Si layer 31 has a lattice constant of the relaxed Si layer 33. No lattice distortion occurs because of matching.
- the strain Si layer 16 of the first embodiment also has a tensile strain.
- this tensile strain corresponds to the relaxed Si Ge lattice constant
- the tensile strain of the strain portion 31 b of the partially strained Si layer 31 of the present embodiment is: It corresponds to the lattice constant of S i Ge that has become longer due to distortion. Therefore, the carrier mobility of the strained portion 31b of the partial strain Si layer 31 of the present embodiment is larger than the carrier mobility of the strained layer 16 of the first embodiment because of the larger lattice distortion. It will be larger.
- the semiconductor device of the present embodiment in the partially strained layer 31, the portion having the lattice distortion (strained portion 31 b) and the portion having no lattice distortion (the first relaxation portion 31 a and the second The carrier mobility is improved in accordance with the ratio to the relaxed portion 31c), and the current driving force is correspondingly improved. Therefore, the semiconductor device of the present embodiment can be implemented when the ratio of the portion having lattice distortion to the portion having no lattice distortion in the partially strained layer 31 exceeds a certain value. 7872
- the semiconductor device of the present embodiment is superior to the semiconductor device of the first embodiment in terms of ease of manufacturing. This is because, in this embodiment, the strained silicon-germanium layer 30 ′ formed on the conventional S 0 I substrate is used as the semiconductor substrate 101, which is relatively difficult to manufacture. This is because there is no need to use an SGOI substrate on which a relaxed silicon-germanium layer 12 ′ is formed.
- FIGS. 12A to 16C a semiconductor device according to a second embodiment and a method for manufacturing the same will be described with reference to FIGS. 12A to 16C.
- a buried oxide film 11 (thickness of about 400 nm or less) is formed on a silicon layer 10; A silicon layer 33 '(thickness of about 10 nm) and a strained silicon-germanium layer 30' with lattice distortion (germanium concentration of about 30%, thickness of about 100 nm) were formed in this order.
- This semiconductor substrate 101 is manufactured as follows.
- the conventional silicon substrate is subjected to thermal oxidation and wet etching using diluted hydrofluoric acid to adjust the silicon layer 33 'on the surface to a desired thickness (about 1 O nm). I do.
- a silicon 'germanium layer (germanium concentration: 30%, thickness: about 100 nm) is epitaxially grown on the silicon layer 33'.
- a semiconductor substrate 101 having a silicon-germanium layer 30 ′ having a compressive strain in a direction parallel to the main surface and a tensile strain in a direction perpendicular to the thickness direction is obtained.
- the n-channel FET formed by Example 2 is a strained silicon Since the strained silicon film 31b having a strain in one direction is formed on the side surface of the n-germanium layer 30, the effective mobility of electrons is increased, and the current driving force is improved. Further, as shown in FIG. 11A, a three-dimensional channel structure composed of a partially strained silicon layer 31 formed on the surface and side surfaces of the strained silicon 'germanium layer 30 was surrounded by a gate electrode 18. Due to the structure's enhanced gate dominance, it can exhibit high current driving force even at low voltage and suppress the short channel effect, making it a device suitable for miniaturization. In this embodiment, the structure and the manufacturing method of the n-channel FET are shown. However, the structure and the manufacturing method of the p-channel FET can be similarly obtained by reversing the polarity of the dopant impurity. Furthermore, complementary FETs can be obtained using n-channel and p-channel FETs.
- the source main body 13 and the drain main body 14 are formed in a rectangular parallelepiped shape, but may be formed in an island shape.
- the fin portion 15 as a connecting portion for connecting the source body portion 13 and the drain body portion 14 is formed in a plate shape, but may be formed in a ridge shape.
- the semiconductor device according to the present invention is useful as a fin FET having improved current driving force.
- the method for manufacturing a semiconductor device according to the present invention is useful as a method for manufacturing a fin FET with improved current driving force.
Description
Claims
Priority Applications (3)
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EP04735510A EP1643560A4 (en) | 2003-05-30 | 2004-05-31 | SEMICONDUCTOR COMPONENT AND METHOD FOR THE PRODUCTION THEREOF |
US10/558,671 US7473967B2 (en) | 2003-05-30 | 2004-05-31 | Strained channel finFET device |
JP2005506590A JP4277021B2 (ja) | 2003-05-30 | 2004-05-31 | 半導体装置 |
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JP2003-155043 | 2003-05-30 | ||
JP2003155043 | 2003-05-30 |
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WO2004107452A1 true WO2004107452A1 (ja) | 2004-12-09 |
WO2004107452B1 WO2004107452B1 (ja) | 2005-03-17 |
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PCT/JP2004/007872 WO2004107452A1 (ja) | 2003-05-30 | 2004-05-31 | 半導体装置およびその製造方法 |
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US (1) | US7473967B2 (ja) |
EP (1) | EP1643560A4 (ja) |
JP (1) | JP4277021B2 (ja) |
CN (1) | CN1799146A (ja) |
WO (1) | WO2004107452A1 (ja) |
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Also Published As
Publication number | Publication date |
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EP1643560A4 (en) | 2007-04-11 |
JP4277021B2 (ja) | 2009-06-10 |
US7473967B2 (en) | 2009-01-06 |
WO2004107452B1 (ja) | 2005-03-17 |
US20070052041A1 (en) | 2007-03-08 |
JPWO2004107452A1 (ja) | 2006-07-20 |
EP1643560A1 (en) | 2006-04-05 |
CN1799146A (zh) | 2006-07-05 |
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