WO2006101068A1 - 半導体装置及びその製造方法 - Google Patents
半導体装置及びその製造方法 Download PDFInfo
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- WO2006101068A1 WO2006101068A1 PCT/JP2006/305522 JP2006305522W WO2006101068A1 WO 2006101068 A1 WO2006101068 A1 WO 2006101068A1 JP 2006305522 W JP2006305522 W JP 2006305522W WO 2006101068 A1 WO2006101068 A1 WO 2006101068A1
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- H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
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- H01L29/107—Substrate region of field-effect devices
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- H01L29/1079—Substrate region of field-effect devices of field-effect transistors with insulated gate
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- H01L21/26—Bombardment with radiation
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- H01L21/265—Bombardment with radiation with high-energy radiation producing ion implantation
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- 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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- 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
- H01L21/823814—Complementary field-effect transistors, e.g. CMOS with a particular manufacturing method of the source or drain structures, e.g. specific source or drain implants or silicided source or drain structures or raised source or drain structures
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- H01L29/7835—Field effect transistors with field effect produced by an insulated gate with lightly doped drain or source extension, e.g. LDD MOSFET's; DDD MOSFET's with asymmetrical source and drain regions, e.g. lateral high-voltage MISFETs with drain offset region, extended drain MISFETs
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- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/665—Unipolar field-effect transistors with an insulated gate, i.e. MISFET using self aligned silicidation, i.e. salicide
Definitions
- the present invention relates to a semiconductor device and a manufacturing method thereof, and more particularly to a semiconductor device including a plurality of MIS transistors and a manufacturing method thereof.
- FIG. 25 is a schematic cross-sectional view illustrating the leakage current in the MOS transistor.
- a gate electrode 104 is formed on a first conductivity type semiconductor substrate 100 via a gate insulating film 102.
- a sidewall insulating film 106 is formed on the side wall of the gate electrode 104.
- an LDD (Lightly Doped Drain) region 108 formed in a self-aligned manner with the gate electrode 104, and a self-aligned with the gate electrode 104 and the sidewall insulating film 106
- a second conductivity type source diffusion layer 112 is formed, which is formed of the impurity diffusion region 110 formed in (1).
- an LDD region 114 formed in a self-aligned manner with the gate electrode 104, and an impurity diffusion region 116 formed in a self-aligned manner with the gate electrode 104 and the sidewall insulating film 106.
- a powerful second conductivity type drain diffusion layer 118 is formed.
- a channel region 120 is formed between the source diffusion layer 112 and the drain diffusion layer 118.
- pocket regions 122 of the first conductivity type are formed, respectively.
- the pocket region 122 is formed for the purpose of preventing the operation because the threshold voltage of the MOS transistor is lowered and the operation may become unstable when the gate length of the gate electrode 104 is reduced.
- leakage current components include subthreshold leakage (IS) flowing from the drain diffusion layer 118 to the source diffusion layer 112 side, and from the drain diffusion layer 118 to the semiconductor substrate 100 side.
- IS subthreshold leakage
- Three types are known: Gate Induced Drain Leakage (GIDL) flowing through the gate electrode, and Gate Leakage (IG) flowing from the gate electrode 104 to the semiconductor substrate 100 side.
- GIDL Gate Induced Drain Leakage
- IG Gate Leakage
- GIDL occurs at the interface between the LDD region 114 and the pocket region 122 at the end of the gate electrode 104 on the drain side.
- GIDL increases as the concentration of impurities injected into the LDD region 114 and the pocket region 122 increases. It is a graph which shows an example of the breakdown of each component of the leakage current which occupies for the whole electric current.
- IS and GIDL are dominant as leakage current components in both NMOS transistors and PMOS transistors.
- IG is known to be negligible as a leakage current component that is sufficiently smaller than IS and GIDL.
- IG is about two orders of magnitude smaller than IS and GIDL, depending on the LSI process technology. Therefore, to reduce leakage current in MOS transistors, it is important to reduce IS or GIDL among the leakage current components.
- FIG. 27 the pocket ion implantation performed for forming the pocket region
- FIG. 27 is a schematic cross-sectional view for explaining pocket ion implantation performed from a direction inclined with respect to the substrate surface.
- Figure 27 (a) shows the state of pocket ion implantation from the direction inclined toward the drain side with respect to the substrate surface
- Figure 27 (b) shows the pocket ion from the direction inclined toward the source side with respect to the substrate surface. Show the state of injection.
- the pocket region 122 is formed for the purpose of preventing the operation of the MOS transistor from becoming unstable when the gate length of the gate electrode 104 is small.
- pocket ion implantation increases the concentration of impurities in this region. One of the causes of increasing L.
- the angle ⁇ when pocket ion implantation is performed from the direction inclined toward the source side or the drain side is set in the range of 0 ° ⁇ 90 °.
- the impurities implanted by pocket ion implantation are uniform in all of the plurality of MOS transistors.
- Pocket ion implantation was performed.
- FIG. 28 is a schematic plan view showing an example of a layout of a plurality of MOS transistors in a conventional semiconductor device.
- the plurality of MOS transistors 124 in the semiconductor device are not arranged in a certain direction. For this reason, as shown in FIG. 28, the arrangement direction of the source diffusion layer 112 and the drain diffusion layer 118 in the semiconductor substrate 100 is aligned with the paper surface, from left to right, from right to left, and from above. The four directions from the lower side and from the lower side to the upper side were mixed.
- FIG. 29 is a schematic plan view for explaining pocket ion implantation from four directions performed for a plurality of MOS transistors arranged as shown in FIG.
- pocket ion implantation is performed on the MOS transistor 124 from four directions.
- Patent Document 1 Japanese Patent No. 3394204
- Patent Document 2 Japanese Patent No. 2787908
- Patent Document 3 Japanese Patent Publication No. 7_89587
- Patent Document 4 Japanese Patent Laid-Open No. 2001-7311
- Patent Document 5 Japanese Patent No. 3299158
- Patent Document 6 Japanese Unexamined Patent Publication No. 2000-156419
- Patent Document 7 International Publication No. 2004/112139 Pamphlet
- the semiconductor device includes a plurality of MOS transistors
- the arrangement direction of the source diffusion layer and the drain diffusion layer is not constant. For this reason, it was difficult to selectively perform ion implantation from either the source side or the drain side for any of the MSO transistors.
- pocket ion implantation is performed from four directions, pocket ion implantation is also performed from the drain side, so that GIDL increases.
- An object of the present invention is to provide a semiconductor device capable of reducing the leakage current of the MIS transistor and reducing the power consumption during standby in a semiconductor device having a plurality of MIS transistors, and a method for manufacturing the same. It is to provide.
- Another object of the present invention is to reduce the leakage current of the MIS transistor and increase the driving current of the MIS transistor to reduce power consumption during standby in a semiconductor device having a plurality of MIS transistors. It is an object of the present invention to provide a semiconductor device and a method for manufacturing the same that can simultaneously realize high-speed operation. Means for solving the problem
- a gate electrode formed on a semiconductor substrate via a gate insulating film and a first conductivity type chip formed in the semiconductor substrate on both sides of the gate electrode.
- a plurality of MIS transistors having a source diffusion layer and a drain diffusion layer of a second conductivity type disposed across a channel region, and the source diffusion layer and the drain diffusion layer of the plurality of MIS transistors are in the same direction
- the first conductivity type pocket region is selectively formed between the source diffusion layer and the channel region of each of the plurality of MIS transistors, and each of the plurality of MIS transistors.
- a semiconductor device is provided in which a pocket non-implanted region is formed between the drain diffusion layer and the channel region.
- a first inverter comprising a first load transistor and a first driver transistor, a second inverter comprising a second load transistor and a second driver transistor.
- the first and second load transistors are arranged so that the source diffusion layer and the drain diffusion layer are aligned in the same direction, and that of the first and second load transistors.
- a rain diffusion layer and a reverse conductivity type pocket region are selectively formed, and a pocket non-implanted region is formed between the drain diffusion layer and the channel region of each of the first and second load transistors.
- a semiconductor device is provided.
- a first inverter including a first load transistor and a first dry transistor, a second load transistor, and a second driver transistor are used.
- a semiconductor device having a plurality of memory cells, the source diffusion layers and drains of the first and second driver transistors. In-diffusion layers are arranged in the same direction, and the first and second driver transistors are disposed between the source diffusion layer and the channel region of each of the first and second driver transistors.
- a pocket region having a conductivity type opposite to that of the source diffusion layer and the drain diffusion layer is selectively formed, and between the drain diffusion layer and the channel region of each of the first and second driver transistors, A semiconductor device in which a pocket non-implanted region is formed is provided.
- a first inverter including a first load transistor and a first dry transistor, a second load transistor, and a second driver transistor are used.
- a semiconductor device having a plurality of memory cells, the source diffusion layer and the drain diffusion layer of the first and second transfer transistors being arranged in the same direction, and the first and second Between the source diffusion layer and the channel region of each transfer transistor, in front of the first and second transfer transistors.
- a pocket region having a conductivity type opposite to that of the source diffusion layer and the drain diffusion layer is selectively formed, and between the drain diffusion layer and the channel region of each of the first and second transfer transistors, A semiconductor device in which a pocket non-implanted region is formed is provided.
- the source diffusion layer and the drain diffusion layer of the plurality of MIS transistors are arranged so as to be aligned in the same direction, and the impurity of the first conductivity type from the direction inclined toward the source diffusion layer side using the gate electrode as a mask.
- the method of manufacturing a semiconductor device that is provided.
- a first inverter including a first load transistor and a first dry transistor, a second load transistor, and a second driver transistor are used.
- the first and second load transistors are arranged such that the source diffusion layer and the drain diffusion layer of the two load transistors are arranged in the same direction, and the gate electrodes of the first and second load transistors are used as a mask.
- a first inverter including a first load transistor and a first dry transistor, a second load transistor, and a second driver transistor are used.
- the source diffusion layer of each of the first and second driver transistors By introducing an impurity having a conductivity type opposite to that of the source diffusion layer and the drain diffusion layer of the first and second driver transistors, the source diffusion layer of each of the first and second driver transistors Between the channel region, a pocket having a conductivity type opposite to that of the source diffusion layer and the drain diffusion layer of the first and second driver transistors.
- the method of manufacturing a semiconductor device further having a higher E of selectively forming a band is provided.
- a first inverter composed of a first load transistor and a first dry transistor
- a second inverter composed of a second load transistor and a second driver transistor.
- a source diffusion layer and a drain diffusion layer in the semiconductor substrate on both sides of each of the gate electrodes of the first and second transfer transistors, and the first and second transfer transistors,
- the source diffusion layer and the drain diffusion layer of the two transfer transistors are arranged in the same direction, and the gate electrodes of the first and second transfer transistors are used as a mask for the first and second transfer transistors.
- the first and second transfer transistors Between the source diffusion layer and the channel region of each of the first and second transfer layers.
- the pocket regions of the source diffusion layer and the drain diffusion layer and the opposite conductivity type Njisuta There is provided a method for manufacturing a semiconductor device, which further includes a step of selectively forming.
- the source diffusion layer and the drain diffusion layer of the plurality of MIS transistors are arranged so as to be aligned in the same direction, and the gate electrode is used as a mask and the direction is inclined toward the source side with respect to the semiconductor substrate surface. Since the impurity for forming the pocket region is introduced from one direction, GIDL can be reduced for a plurality of MIS transistors, and power consumption during standby of the semiconductor device can be reduced.
- impurities having the same conductivity type as the source / drain diffusion layer are introduced from the direction inclined toward the drain side with respect to the surface of the semiconductor substrate using the gate electrode as a mask. Since the impurity diffusion region extending to the bottom of the gate electrode is formed in the drain diffusion layer, the effective channel length of the MIS transistor can be shortened and the drive current of the MIS transistor can be increased.
- FIG. 1 is a schematic plan view showing a layout of a plurality of MOS transistors in a semiconductor device according to a first embodiment of the present invention.
- FIG. 2 is a schematic cross-sectional view showing the structure of a MOS transistor in the semiconductor device according to the first embodiment of the present invention.
- FIG. 3 is a graph showing a leakage current and a driving current of a MOS transistor in the semiconductor device according to the first embodiment of the present invention.
- FIG. 4 is a process cross-sectional view (part 1) illustrating the method for manufacturing the semiconductor device according to the first embodiment of the invention.
- FIG. 5 is a process cross-sectional view (part 2) illustrating the method for manufacturing the semiconductor device according to the first embodiment of the present invention
- FIG. 6 is a process cross-sectional view (part 3) illustrating the method for manufacturing the semiconductor device according to the first embodiment of the present invention
- FIG. 7 is a block diagram showing a circuit configuration of a semiconductor device according to a second embodiment of the present invention.
- FIG. 8 is an equivalent of an SRAM cell in a semiconductor device according to a second embodiment of the present invention. It is a circuit diagram which shows a circuit.
- FIG. 9 is a schematic plan view showing the layout of the SRAM cell in the semiconductor device according to the second embodiment of the present invention.
- FIG. 10 is a schematic plan view showing an SRAM cell array in a semiconductor device according to a second embodiment of the present invention.
- FIG. 11 is a schematic plan view showing a layout of a conventional SRAM cell.
- FIG. 12 is a process plan view (part 1) illustrating the method for manufacturing the semiconductor device according to the second embodiment of the present invention.
- FIG. 13 is a process plan view (part 2) illustrating the method for manufacturing the semiconductor device according to the second embodiment of the present invention.
- FIG. 14 is a process plan view (part 3) illustrating the method for manufacturing a semiconductor device according to the second embodiment of the present invention.
- FIG. 15 is a schematic plan view showing an SRAM cell array in a semiconductor device according to a modification of the second embodiment of the present invention.
- FIG. 16 is a schematic plan view showing an SRAM cell in a semiconductor device according to a modification of the second embodiment of the present invention.
- FIG. 17 is a schematic cross-sectional view showing the structure of the NMOS transistor in the semiconductor device according to the third embodiment of the present invention.
- FIG. 18 is a process sectional view showing a method for producing a semiconductor device according to a third embodiment of the invention.
- FIG. 19 is a schematic cross-sectional view showing the structure of a PMOS transistor in a semiconductor device according to a fourth embodiment of the present invention.
- FIG. 20 is a process sectional view showing a method for producing a semiconductor device according to a fourth embodiment of the invention.
- FIG. 21 is a graph showing the leakage current and driving current of the MOS transistor in the semiconductor device according to the third and fourth embodiments of the present invention.
- FIG. 22 is a schematic plan view showing the layout of the SRAM cell in the semiconductor device according to the fifth embodiment of the present invention.
- FIG. 23 is a process plan view (part 1) illustrating the method for manufacturing a semiconductor device according to the fifth embodiment of the present invention.
- FIG. 24 is a process plan view (part 2) illustrating the method for manufacturing the semiconductor device according to the fifth embodiment of the present invention.
- FIG. 25 is a schematic cross-sectional view illustrating a leakage current in a MOS transistor.
- FIG. 26 is a graph showing an example of the breakdown of each component of the leakage current in the entire leakage current of the MOS transistor.
- FIG. 27 is a schematic cross-sectional view illustrating pocket ion implantation performed from a direction inclined with respect to the substrate surface.
- FIG. 28 is a schematic plan view showing an example of a layout of a plurality of MOS transistors in a conventional semiconductor device.
- FIG. 29 is a schematic cross-sectional view illustrating pocket ion implantation from four directions. Explanation of symbols
- FIGS. 1 is a schematic plan view showing the layout of a plurality of MOS transistors in the semiconductor device according to the present embodiment
- FIG. 2 is a schematic cross-sectional view showing the structure of the MOS transistor in the semiconductor device according to the present embodiment
- FIG. 3 is according to the present embodiment.
- FIG. 4 to FIG. 6 are process cross-sectional views illustrating a method for manufacturing a semiconductor device according to this embodiment.
- FIG. 4 to FIG. 6 are graphs showing leakage currents and drive currents of MOS transistors in the semiconductor device.
- a plurality of M0S transistors 12 are arranged on a semiconductor substrate 10.
- the MOS transistor 12 has a gate electrode 20 and a source diffusion layer 28 and a drain diffusion layer 34 formed in the semiconductor substrate 10 on both sides of the gate electrode 20.
- S is appropriately added to the region where the source diffusion layer is formed (including the region to be formed), and the region where the drain diffusion layer is formed (including the region to be formed). ) Is appended with "D".
- a PMOS transistor and an NMOS transistor are mixed. All of the plurality of MOS transistors 12 are PMOS transistors or N Even MOS transistors.
- the source diffusion layer 28 and the drain diffusion layer 34 of the plurality of MOS transistors 12 are arranged in the same direction.
- FIG. 2 shows a cross-sectional structure of the MOS transistor 12 arranged as shown in FIG.
- an element isolation film 14 that defines an active region is formed on the semiconductor substrate 10.
- a first conductivity type well 16 is formed in the semiconductor substrate 10 in which the active region is defined.
- a gate electrode 20 is formed on the semiconductor substrate 10 via a gate insulating film 18.
- a sidewall insulating film 22 is formed on the side wall of the gate electrode 20.
- an LDD region 24 formed in a self-aligned manner with the gate electrode 20 and an impurity formed in a self-aligned manner with the gate electrode 20 and the sidewall insulating film 22 A source diffusion layer 28 of the second conductivity type composed of the diffusion region 26 is formed.
- an LDD region 30 formed by self-alignment with the gate electrode 20 and an impurity diffusion region 32 formed by self-alignment with the gate electrode 20 and the sidewall insulating film 22 is formed in the semiconductor substrate 10 on the drain side of the gate electrode 20, an LDD region 30 formed by self-alignment with the gate electrode 20 and an impurity diffusion region 32 formed by self-alignment with the gate electrode 20 and the sidewall insulating film 22.
- a drain diffusion layer 34 of the second conductivity type consisting of is formed.
- the first conductive type channel region 36 is formed between the source diffusion layer 28 and the drain diffusion layer 34.
- a pocket region 38 of the second conductivity type is formed between the source diffusion layer 28 and the channel region 36.
- no pocket region is formed between the drain diffusion layer 34 and the channel region 36. That is, between the drain diffusion layer 34 and the channel region 36, impurities (pocket impurities) due to pocket ion implantation are implanted by the shadow effect of the gate electrode 20, and regions (pocket impurity non-implanted regions) 40 and It ’s going to be.
- a silicide film 42 is formed on the gate electrode 20, the source diffusion layer 28, and the drain diffusion layer 34, respectively.
- the source diffusion layer 28 and the drain diffusion layer 34 of the plurality of MOO transistors 12 are arranged in the same direction, and the source diffusion layer of each MOO transistor 12 is arranged.
- a pocket region 38 is selectively formed between the drain region 34 and the channel region 36, and a pocket impurity non-implanted region 40 is formed between the drain diffusion layer 34 and the channel region 36.
- the main characteristic is that it is connected.
- each of the plurality of MOS transistors 12 is inclined toward the source side.
- Pocket ion implantation can be performed from one direction.
- a pocket region 38 is selectively formed between the source diffusion layer 28 and the channel region 36 of each MSO transistor 12, while no pocket impurity is formed between the drain diffusion layer 34 and the channel region 36.
- the implantation region 40 can be used. Therefore, GIDL can be reduced even if the MOS transistors 12 are misaligned or misaligned, and the power consumption during standby of the semiconductor device can be reduced.
- FIG. 3 (a) is a graph showing the leakage current of the MOS transistor in the semiconductor device according to the present embodiment
- FIG. 3 (b) is a graph showing the drive current.
- FIGS. 3 (a) and 3 (b) also show the leakage current and driving current of the MOS transistor according to the prior art in which pocket ion implantation is performed from four directions, respectively.
- the IS is the case according to the prior art and the case according to the present embodiment. There is no big difference.
- GIDL is reduced to about 1/4 of the case of the prior art. For this reason, in the case of this embodiment, the entire leakage current is reduced to about half that of the conventional technique.
- the leakage current of the MOS transistor can be reduced without degrading the operating characteristics of the MOS transistor.
- the element isolation film 14 is formed by the n) method, and an active region where a plurality of MOS transistors 12 are formed is defined (FIG. 4 (a)).
- the active region is defined so that the region where the source diffusion layer 28 of the plurality of MOS transistors 12 is formed and the region where the drain diffusion layer 34 is formed are aligned in the same direction.
- impurities are introduced into the semiconductor substrate 10 by, eg, ion implantation to form a predetermined conductive type well 16.
- phosphorus (P) is ion-implanted as an n-type impurity under the conditions of an acceleration energy of 500 keV and a dose of l ⁇ 10 13 cm — 2 , for example.
- antimony (Sb), arsenic (As), or the like may be used as the n-type impurity.
- boron (B) for example, as a p-type impurity is ion-implanted into the region where the NMOS transistor is formed, for example, under the conditions of an acceleration energy of 250 keV and a dose of 1 ⁇ 10 13 cm ⁇ 2 .
- indium (In) or the like may be used as the p-type impurity.
- the impurity ion implantation for forming the well 16 is divided into a region where the PMOS transistor is formed and a region where the NMOS transistor is formed using a photoresist film by lithography as a mask. The same applies to impurity ion implantation performed thereafter.
- an impurity of a predetermined conductivity type is introduced into the channel region 36 in the semiconductor substrate 10 by, eg, ion implantation (FIG. 4B).
- ion implantation e.g, ion implantation
- arsenic is ion-implanted as an n-type impurity in the region where the PMOS transistor is formed, for example, under the conditions of an acceleration energy of 80 keV and a dose of 2 ⁇ 10 12 cm 1 2 .
- phosphorus, antimony, or the like may be used as the n-type impurity.
- boron as a p-type impurity is ion-implanted into the region where the NMOS transistor is formed, for example, under the conditions of an acceleration energy of 20 keV and a dose of 5 ⁇ 10 12 cm ⁇ 2 .
- Use p-type impurities such as indium.
- a gate insulating film 18 made of a silicon oxide film of, eg, a 3 nm-thickness is formed on the semiconductor substrate 10 by, eg, thermal oxidation (FIG. 4C).
- a hafnium oxide (HfO) film, a hafnium aluminum oxide (HfAlO) film, an aluminum oxide (AIO) film, or a film obtained by adding nitrogen (N) to these films may be formed. Les.
- the polysilicon film 20 is patterned to form the gate electrode 20 made of the polysilicon film and having a gate length of, for example, 200 nm (FIG. 5A).
- the gate electrode 20 is made of a metal or a metal-containing material such as aluminum (A1), titanium (Ti), titanium nitride ((), tungsten (W), nickel silicide (NiSi), and cobalt silicide (CoSi). You can form things.
- impurities are introduced into the semiconductor substrate 10 on both sides of the gate electrode 20 by, eg, ion implantation using the gate electrode 20 as a mask.
- LDD regions 24 and 30 are formed in the semiconductor substrate 10 on the source and drain sides of the gate electrode 20 (FIG. 5B).
- boron as a p-type impurity is ion-implanted into the region for forming the PMOS transistor under the conditions of, for example, an acceleration energy of 20 keV and a dose of 2 ⁇ 10 M cm 2 .
- the region for forming the NMOS transistors for example, arsenic as an n-type impurity, for example, an acceleration energy 2 0KeV, is ion-implanted under the conditions of a dose of 2 X 10 M cm_ 2.
- the ion implantation for forming the LDD region may be performed with a directional force inclined toward the source side or the drain side with respect to the surface of the semiconductor substrate 10.
- pocket ion implantation is performed from a direction inclined toward the source side with respect to the surface of the semiconductor substrate 10 to form a pocket region 38 (FIG. 5 (c)).
- ions as the incident angle an angle inclined to the source side for example 45 °, as an n-type impurity such as phosphorus, for example, an acceleration energy 30 keV, at a dose of 3 X 10 13 cm_ 2 inject.
- the incident angle is 45 ° to the source side
- boron is used as the p-type impurity.
- acceleration energy is 20 keV and the dose is 3 X 10 13 cm- 2 Ion implantation.
- the gate electrode 20 is shadowed between the drain diffusion layer 34 and the channel region 36. Due to the effect, a pocket impurity non-implanted region 40 is formed. For this reason, the pocket region 38 is selectively formed between the source diffusion layer 28 and the channel region 36.
- each of the plurality of MOS transistors 12 is arranged on the source side. Performs pocket ion implantation from one direction of inclination. That power S.
- a pocket region 38 is selectively formed between the source diffusion layer 28 and the channel region 36 of each MOS transistor 12, while a pocket impurity non-implanted region is formed between the drain diffusion layer 34 and the channel region 36.
- Can be 40 Therefore, GIDL can be reduced for any of the plurality of MOS transistors 12, and power consumption during standby of the semiconductor device can be reduced.
- the incident angle ⁇ of pocket ion implantation depends on the height of the gate electrode 20, etc. 0 ° ⁇
- a 2 nm-thickness silicon oxide film for example, is formed on the entire surface by, eg, thermal CVD, and this silicon oxide film is anisotropically etched to form a sidewall insulating film 22 on the side wall of the gate electrode 20. (Fig. 6 (a)).
- impurities are introduced into the semiconductor substrate 10 on both sides of the gate electrode 20 and the sidewall insulating film 22 by, eg, ion implantation using the gate electrode 20 and the sidewall insulating film 22 as a mask.
- impurity diffusion regions 26 and 32 are formed in the semiconductor substrate 10 on the source and drain sides of the gate electrode 20 and the sidewall insulating film 22 (FIG. 6B).
- boron as a p-type impurity is ion-implanted into the region for forming the PMOS transistor under the conditions of, for example, acceleration energy of 15 keV and a dose of 1 ⁇ 10 15 cm — 2 .
- arsenic as an n-type impurity is ion-implanted in the region for forming the N MOS transistor under the conditions of, for example, an acceleration energy of 20 keV and a dose of 1 ⁇ 10 15 cm _2 .
- the source diffusion layer 28 composed of the LDD region 24 and the impurity diffusion region 26 is formed in the semiconductor substrate 10 on the source side of the gate electrode 20, and is formed in the semiconductor substrate 10 on the drain side of the gate electrode 20.
- the drain diffusion layer 34 composed of the LDD region 30 and the impurity diffusion region 32 is formed.
- a pocket region 38 is formed between the source diffusion layer 28 and the channel region 36, whereas a pocket impurity non-implanted region 40 is formed between the drain diffusion layer 34 and the channel region 36.
- a silicide film 42 made of, for example, cobalt silicide (CoSi) is formed on the gate electrode 20, the source diffusion layer 28, and the drain diffusion layer 34 by, for example, a normal salicide process (FIG. 6 ( c)).
- an ordinary semiconductor device is formed on the semiconductor substrate 10 on which the MOO transistor 12 is formed.
- the wiring layer is appropriately formed using the manufacturing process.
- the semiconductor device according to the present embodiment is manufactured.
- the source diffusion layers 28 and the drain diffusion layers 34 of the plurality of MOS transistors 12 are arranged so as to be aligned in the same direction, and inclined toward the source side with respect to the surface of the semiconductor substrate 10. Since the pocket ion implantation is performed from one direction, the pocket region 38 is selectively formed between the source diffusion layer 28 and the channel region 36 for the plurality of MOS transistors, while the drain diffusion layer 34 and the channel Between the region 36, a pocket impurity non-implanted region 40 can be formed. As a result, GIDL can be reduced and power consumption during standby of the semiconductor device can be reduced.
- FIGS. 7 is a block diagram showing a circuit configuration of the semiconductor device according to the present embodiment
- FIG. 8 is a circuit diagram showing an equivalent circuit of the SRAM cell in the semiconductor device according to the present embodiment
- FIG. 9 is an SRAM cell in the semiconductor device according to the present embodiment
- FIG. 10 is a schematic plan view showing the SRAM cell array in the semiconductor device according to the present embodiment
- FIG. 11 is a schematic plan view showing the layout of the conventional SRAM cell
- FIGS. It is a process top view showing a manufacturing method of a semiconductor device by an embodiment. Note that the same components as those of the semiconductor device and the manufacturing method thereof according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.
- the present embodiment is a semiconductor device having an SRAM circuit block 44, a logic circuit block 46, a CPU circuit block 48, and a peripheral circuit block 50.
- the invention is applied. That is, this embodiment In the SRAM circuit block 44, for each of the load transistor and driver transistor constituting the SRAM cell, the source diffusion layer and the drain diffusion layer are arranged in the same direction, and the gate electrode is used as a mask with respect to the substrate surface. In this way, directional force inclined toward the source side and pocket ion implantation are performed.
- the SRAM cell MC in the semiconductor device according to the present embodiment is arranged in an intersection region between the node line WL and a pair of bit lines BL, / BL (BL bar).
- the SRAM cell MC is of a CMOS type, and includes a pair of load transistors Ll and L2, a pair of driver transistors Dl and D2, and a pair of transfer transistors Tl and ⁇ 2.
- Load transistors Ll and L2 are composed of PMOS transistors
- driver transistors Dl and D2 and transfer transistors Tl and ⁇ 2 are composed of NMOS transistors, and each cell has 6 MOS transistors. .
- the inverter INV1 is constituted by the load transistor L1 and the driver transistor D1.
- the load transistor L2 and the driver transistor D2 constitute an inverter INV2.
- the inverter INV1 and the inverter INV2 constitute a flip-flop circuit FF.
- the flip-flop circuit FF is controlled by transfer transistors Tl and T2 connected to the bit lines BL and / BL and the word line WL.
- the SRAM cell MC formed on the semiconductor substrate 10 includes a load transistor section 52 in which load transistors Ll and L2 are formed, and a dry transistor in which driver transistors Dl and D2 are formed. It has a transistor part 54 and a transfer transistor part 56 in which transfer transistors Tl and 2 are formed.
- the active region A1 in which the load transistor L1 is formed and the active region 2 in which the load transistor L2 is formed are separated from each other by the element isolation film 14.
- the adjacent load transistors Ll and L2 are formed independently of each other, and the source diffusion layer 28p and the drain diffusion layer 34p of the load transistors Ll and L2 are arranged in the same direction.
- a pocket region is selectively formed between the source diffusion layer 28p and the channel region, and a pocket impurity non-implanted region 40a is formed between the drain diffusion layer 34p and the channel region. ing.
- the active state in which the driver transistor D1 is formed The region A3 and the active region A4 where the driver transistor D2 is formed are separated from each other by the element isolation film.
- the adjacent driver transistors Dl and D2 are formed independently of each other, and the source diffusion layers 28 ⁇ and the drain diffusion layers 34 ⁇ of the driver transistors Dl and D2 are arranged in the same direction.
- a pocket region is selectively formed between the source diffusion layer 28 ⁇ and the channel region, and a pocket impurity non-implanted region 40b is formed between the drain diffusion layer 34 ⁇ and the channel region.
- the active region A5 in which the transfer transistor T1 is formed is connected to the active region A3 in which the driver transistor D1 is formed.
- the active region A6 in which the transfer transistor T2 is formed is connected to the active region A4 in which the driver transistor D2 is formed.
- the load transistor L1 and the driver transistor D1 have a common gate electrode 20a.
- the load transistor L2 and the driver transistor D2 have a common gate electrode 20b.
- the transfer transistors T1 and T2 have a common gate electrode 20c.
- the SRAM cell MC shown in FIG. 9 is repeatedly arranged in the row direction (horizontal direction on the paper surface) and the column direction (vertical direction on the paper surface) to constitute a memory cell array.
- the load transistors Ll and L2, the driver transistors Dl and D2, and the transfer transistors Tl and ⁇ 2 are arranged in the same direction.
- the transfer transistors Tl and ⁇ 2 of the plurality of SRAM cells MC arranged in the row direction have a common gate electrode 20c.
- a pair of SRAM cells MC adjacent to each other in the column direction includes load transistors Ll and L2, driver transistors Dl and D2, and transfer transistors Tl and ⁇ 2 that are arranged symmetrically with respect to the boundary line between them. Yes.
- the active region A5 in which the transfer transistor T1 is formed is connected to each other, and the active region A6 in which the transfer transistor T2 is formed is connected to each other.
- the load transistors Ll and L2 in contact with P are formed independently of each other, and the source diffusion layer 28p and the drain diffusion layer 34p are arranged in the same direction.
- the adjacent driver transistors Dl and D2 The main feature is that they are formed independently of each other and the source diffusion layer 28 ⁇ and the drain diffusion layer 34 ⁇ are arranged in the same direction.
- a conventional SRAM cell has a layout in which the source diffusion layer or drain diffusion layer of adjacent MOS transistors is shared.
- FIG. 11 is a schematic plan view showing a layout of a conventional SRAM cell.
- the active regions Al and A2 are formed physically, and in the load transistors Ll and L2 in contact with P, the drain diffusion layer 34p is shared. . Further, the active regions A3 and A4 are formed in a body-like manner, and the source diffusion layer 28 ⁇ is shared by the driver transistors Dl and D2 in contact with P. That is, the source diffusion layer 28p and the drain diffusion layer 34p of the load transistors Ll and L2 are not aligned in the same direction, and the source diffusion layer 28 ⁇ and the drain diffusion layer 34 ⁇ of the driver transistors Dl and D2 are also aligned in the same direction. It was n’t.
- the adjacent load transistors Ll and L2 are formed independently of each other, and the source diffusion layer 28p and the drain diffusion layer 34p are in the same direction.
- the adjacent driver transistors Dl and D2 are formed independently of each other, and the source diffusion layer 28 ⁇ and the drain diffusion layer 34 ⁇ are arranged in the same direction.
- pocket ion implantation can be performed from one direction inclined to the source side with respect to the surface of the semiconductor substrate 10. Therefore, in the semiconductor device according to the present embodiment, a pocket region is selectively formed between the source diffusion layer 28p and the channel region for both the load transistors Ll and L2, and as shown in FIG.
- the force between the diffusion layer 34p and the channel region is a pocket impurity non-implanted region 40a.
- the driver transistors Dl and D2 are also sources with respect to the surface of the semiconductor substrate 10. Pocket ion implantation can be performed from one direction inclined sideways. For this reason, in the semiconductor device according to the present embodiment, a pocket region is selectively formed between the source diffusion layer 28 ⁇ and the channel region in both of the driver transistors Dl and D2, as shown in FIG. The force between the drain diffusion layer 34 ⁇ and the channel region is a pocket impurity non-injection region 40b.
- the load transistors Ll and L2, the driver transistors Dl and D2, and the like are formed using the semiconductor device manufacturing method according to the first embodiment shown in FIGS.
- the element isolation film 14 is formed on the semiconductor substrate 10 made of, for example, silicon by, for example, the STI method, and the load transistors Ll, L2, the driver transistor Dl,
- the active regions ⁇ 1 to ⁇ 6 where D2, transfer transistor Tl and ⁇ 2 are formed are defined (Fig. 12 (a)).
- the regions where the source diffusion layers 28 ⁇ and 28 ⁇ of the load transistors Ll and L2 and the dry transistors Dl and D2 are formed and the regions where the drain diffusion layers 34 ⁇ and 34 ⁇ are formed are aligned in the same direction. Define as follows.
- impurities are introduced into the semiconductor substrate 10 by, eg, ion implantation to form the wells 16n and 16p having predetermined conductivity types (FIG. 12 (b)).
- the region where the PMOS transistor is formed that is, the region where the load transistors Ll and L2 are formed
- an n-type hole 16 ⁇ is formed.
- the region where the NMOS transistor is formed that is, the region where the driver transistors Dl and D2 and the transfer transistor Tl and ⁇ 2 are formed, a ⁇ -type ruler 16 ⁇ is formed.
- a predetermined lead is introduced into the channel region in the semiconductor substrate 10 by, eg, ion implantation.
- Electric type impurities are introduced (Fig. 4 (b)).
- An n-type impurity is ion-implanted into a region where the PMOS transistor is formed, that is, a region where the load transistors Ll and L2 are formed.
- ⁇ -type impurities are ion-implanted in the region where the NMOS transistor is formed, that is, the region where the driver transistors Dl and D2, the transfer transistors Tl and ⁇ 2 are formed.
- the well injection and the channel injection are divided between a region where a PMOS transistor is formed and a region where an NMOS transistor is formed using a photoresist film formed by lithography as a mask.
- the gate electrodes 20a, 20b, and 20c are formed on the semiconductor substrate 10 through the gate insulating film. (Fig. 13 (a)).
- the gate electrode 20a is common to the load transistor L1 and the driver transistor D1
- the gate electrode 20b is common to the load transistor L2 and the driver transistor D2.
- ion implantation for forming an LDD region is performed on the load transistors Ll and L2, the driver transistors Dl and D2, and the transfer transistors Tl and ⁇ 2. .
- the ion implantation for forming the LDD region is divided into a region where the PMOS transistor is formed and a region where the NMOS transistor is formed using a photoresist film by lithography as a mask.
- the ion implantation for forming the LDD region may be performed with a directional force inclined toward the source side or the drain side with respect to the surface of the semiconductor substrate 10.
- a photolithographic technique covers a region where the load transistors Ll and L2 and transfer transistors Tl and ⁇ 2 are formed, and exposes a region where the driver transistors Dl and D2 are formed. A film is formed.
- the driver transistors Dl and D2 in contact with P are formed independently of each other, and the source diffusion layer 28 ⁇ and the drain diffusion layer 34 ⁇ are arranged in the same direction, so that the dry transistor Dl With respect to D2, pocket ion implantation can be performed from one direction inclined to the source side with respect to the surface of the semiconductor substrate 10.
- a photolithographic technique covers a region where the driver transistors Dl and D2 and the transfer transistors Tl and ⁇ 2 are formed, and exposes a region where the load transistors Ll and L2 are formed. A film is formed.
- n-type impurity pocket ion implantation is also performed with a directional force inclined toward the source side with respect to the surface of the semiconductor substrate 10 (FIG. 14).
- a pocket impurity non-implanted region 40a is formed by the shadow effect of the gate electrodes 20a and 20b.
- adjacent load transistors Ll and L2 force S are formed independently of each other.
- pocket ion implantation can be performed from one direction inclined to the source side with respect to the surface of the semiconductor substrate 10.
- a sidewall insulating film is formed on the side walls of the gate electrodes 20a, 20b, 20c in the same manner as in the step shown in FIG. 6 (a).
- deep impurities in the source diffusion layer and the drain diffusion layer are obtained for the load transistors Ll and L2, the driver transistors Dl and D2, and the transfer transistors Tl and ⁇ 2.
- Ion implantation is performed to form a diffusion region. Ion implantation for forming a deep impurity diffusion region is performed using a photoresist film formed by lithography as a mask, and is divided into a region where a PMOS transistor is formed and a region where an NMOS transistor is formed.
- a silicide film is formed on the gate electrodes 20a, 20b, 20c, the source diffusion layer, and the drain diffusion layer in the same manner as in the step shown in FIG. 6 (c).
- a wiring layer is appropriately formed on the semiconductor substrate 10 on which the load transistors Ll and L2, the driver transistors Dl and D2, and the transfer transistors Tl and ⁇ 2 are formed, using a normal semiconductor device manufacturing process.
- the semiconductor device according to the present embodiment is manufactured.
- the load diffusion layers Ll and L2 and the driver transistors D1 and D2 are arranged so that the source diffusion layer and the drain diffusion layer are arranged in the same direction. Since the pocket ion implantation is performed from one direction inclined to the source side with respect to the surface, GIDL can be reduced and the power consumption during standby of the semiconductor device can be reduced.
- the present invention is applied to the SRAM circuit block 44 in the semiconductor device having the circuit configuration shown in FIG. 7 .
- the present invention may also be applied to the logic circuit 46 that is dominant in the leakage current of the entire LSI.
- the present invention may be applied to the peripheral circuit block 50 including the CPU circuit block 48, the booster circuit, the step-down circuit and the like.
- the load transistors Ll and L2 the driver transistors Dl, D2, and Place transfer transistors Tl and ⁇ 2 in the same direction.
- the SRAM cell MC is arranged as shown in FIG. 15, and the transfer transistors Tl and ⁇ 2 are also subjected to pocket ion implantation from one direction inclined to the source side with respect to the surface of the semiconductor substrate 10. In this case, the SRAM cell MC is shown.
- a pocket impurity non-implanted region 40c is formed between the drain diffusion layer and the channel region.
- the transfer transistors Tl and ⁇ 2 may also be subjected to pocket ion implantation from one direction inclined to the source side with respect to the surface of the semiconductor substrate 10. As a result, the GIDL of the transfer transistors Tl and ⁇ 2 can also be reduced, and the power consumption during standby of the semiconductor device can be further reduced.
- the load transistors Ll and L2 and the driver transistors Dl and D2 have been described with respect to the case where the pocket ion implantation is performed from the direction inclined toward the source side with respect to the surface of the semiconductor substrate 10.
- pocket ion implantation may be performed from a direction inclined toward the source side with respect to the surface of the semiconductor substrate 10.
- load transistors Ll and L2 and the driver transistors Dl and D2 in all the SRAM cells MC need not be arranged so that the source diffusion layer and the drain diffusion layer are aligned in the same direction.
- FIG. 17 shows the structure of the semiconductor device according to the present embodiment.
- FIG. 18 is a schematic cross-sectional view
- FIG. 18 is a process cross-sectional view illustrating the method for manufacturing the semiconductor device according to the present embodiment
- FIG. 21 is a graph illustrating the leakage current and drive current of the NMOS transistor in the semiconductor device according to the present embodiment. Note that the same components as those in the semiconductor device and the manufacturing method thereof according to the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted or simplified.
- the basic configuration of the semiconductor device according to the present embodiment is substantially the same as that of the semiconductor device according to the first embodiment.
- an impurity having the same conductivity type as that of the source diffusion layer and the drain diffusion layer is further ion-implanted with a direction force inclined toward the drain side with respect to the surface of the semiconductor substrate 10.
- the MOS transistor 12 is the NMOS transistor 12 ⁇ will be described.
- an element isolation film 14 that defines an active region is formed.
- a ⁇ -type tool 16 ⁇ is formed in the semiconductor substrate 10 in which the active region is defined.
- a gate electrode 20 is formed on the semiconductor substrate 10 via a gate insulating film 18.
- a sidewall insulating film 22 is formed on the side wall of the gate electrode 20.
- an LDD region 24 ⁇ formed in a self-aligned manner with the gate electrode 20 and an impurity formed in a self-aligned manner with the gate electrode 20 and the sidewall insulating film 22 A ⁇ -type source diffusion layer 28 ⁇ composed of a diffusion region 26 ⁇ is formed.
- a ⁇ -type drain diffusion layer 34 ⁇ is formed.
- a ⁇ -type channel region 36 ⁇ is formed between the source diffusion layer 28 ⁇ and the drain diffusion layer 34 ⁇ .
- a ⁇ -type pocket region 38 ⁇ is formed between the source diffusion layer 28 ⁇ and the channel region 36 ⁇ .
- no pocket region is formed between the drain diffusion layer 34 ⁇ and the channel region 36 ⁇ . That is, the pocket impurity unimplanted region 40 is between the drain diffusion layer 34 ⁇ and the channel region 36 ⁇ .
- the drain diffusion layer 34 ⁇ has a gate electrode 20 side end shallower than the LDD region 30 ⁇ .
- the n-type impurity diffusion region 58n extends to the bottom of the gate electrode 20.
- a silicide film 42 is formed on the gate electrode 20, the source diffusion layer 28 ⁇ , and the drain diffusion layer 34 ⁇ .
- the pocket region 38 ⁇ is selectively formed between the source diffusion layer 28 ⁇ of the S transistor 12 ⁇ and the channel region 36 ⁇ , and the drain
- the pocket impurity non-implanted region 40 is between the diffusion layer 34 ⁇ and the channel region 36 ⁇ .
- the semiconductor device according to the present embodiment has the ⁇ -type impurity diffusion region 58 ⁇ in which the drain diffusion layer 34 ⁇ is shallower than the LDD region 30 ⁇ and the end on the side of the gate electrode 20 extends below the gate electrode 20.
- the ⁇ -type impurity diffusion region 58 ⁇ is formed by ion-implanting a directional force ⁇ -type impurity inclined toward the drain side with respect to the surface of the semiconductor substrate 10 as will be described later.
- the effective channel length of the NMOS transistor 12 ⁇ is shortened by the ⁇ -type impurity diffusion region 58 ⁇ . Therefore, the drive current of the NMOS transistor 12n can be increased.
- FIG. 21 (a) is a graph showing the leakage current of the NMOS transistor in the semiconductor device according to the present embodiment
- FIG. 21 (b) is a graph showing the drive current.
- FIGS. 21 (a) and 21 (b) also show the leakage current and drive current of the NMOS transistor according to the prior art.
- the drive current of the NMOS transistor is increased by about 1.5 times that in the case of the conventional technique.
- the leakage current of the NMOS transistor can be reduced and the driving current of the NMOS transistor can be increased.
- LDD regions 24 ⁇ and 30 ⁇ are formed in the same manner as in the case of forming the NMOS transistor in the semiconductor device manufacturing method according to the first embodiment shown in FIGS. 4 (a) to 5 (b). (Fig. 18 (a)).
- the directional force inclined toward the source side with respect to the surface of the semiconductor substrate 10 is also subjected to pocket ion implantation of p-type impurities to form the pocket region 38p (FIG. 18B).
- pocket ion implantation as an incident angle an angle inclined to the source side for example 30 °, boron as p-type impurity, for example, an acceleration energy of 20 keV, is ion-implanted under the conditions of a dose of 2 X 10 13 cm_ 2. Indium or the like may be used as the p-type impurity.
- the source diffusion layer of the NMOS transistor 12 ⁇ A pocket region 38p is selectively formed between 28 ⁇ and the channel region 36p, while a pocket impurity non-implanted region 40 can be formed between the drain diffusion layer 34 ⁇ and the channel region 36p. Therefore, GIDL can be reduced for the NMOS transistor 12 ⁇ , and power consumption during standby of the semiconductor device can be reduced.
- the incident angle ⁇ 1 of pocket ion implantation can be appropriately set in the range of 0 ° ⁇ 1 ⁇ 90 ° according to the height of the gate electrode 20 or the like.
- ion implantation of ⁇ -type impurities is performed from the direction inclined to the drain side with respect to the surface of the semiconductor substrate 10.
- a ⁇ -type impurity diffusion region 58 ⁇ is formed in the semiconductor substrate 10 on the drain side of the gate electrode 20 and the end on the gate electrode 20 side, which is shallower than the LDD region 30 ⁇ , extends to below the gate electrode 20 (FIG. 18 (c)).
- the incident angle is, for example, an angle inclined by 30 ° toward the drain side, and arsenic is used as the ⁇ -type impurity, for example, a high-speed energy of 10 keV and a dose of 4 X 10 13 ions are implanted at an CM_ 2 conditions. Even if phosphorus is used as an n-type impurity Good.
- the n-type impurity ion implantation is performed with the directional force inclined to the drain side with respect to the surface of the semiconductor substrate 10 to form the n-type impurity diffusion region 58 ⁇ , so that the effective channel length of the NMOS transistor 12 ⁇ Can be shortened. Therefore, the drive current of the NMOS transistor 12 ⁇ can be increased.
- Incident angle ⁇ 2 of ion implantation for forming ⁇ -type impurity diffusion region 58 ⁇ should be set as appropriate within the range of 0 ° ⁇ 2 ⁇ 90 ° according to the height of gate electrode 20 and the like. Can do.
- the source diffusion layer 28 ⁇ and the channel region of the NMOS transistor 12 ⁇ While the pocket region 38 ⁇ is selectively formed between the region 36 and 36 ⁇ , the pocket impurity non-implanted region 40 can be formed between the drain diffusion layer 34 ⁇ and the channel region 36 ⁇ . Therefore, GIDL can be reduced for the NMOS transistor 12 ⁇ , and power consumption during standby of the semiconductor device can be reduced.
- the direction force inclined toward the drain side with respect to the surface of the semiconductor substrate 10, ion implantation of a ⁇ -type impurity is performed, and the semiconductor substrate 10 on the drain side of the gate electrode 20.
- the ⁇ -type impurity diffusion region 58 ⁇ whose end on the gate electrode 20 side extends to the lower side of the gate electrode 20 is formed therein, so that the effective channel length of the NMOS transistor 12 ⁇ can be shortened. Therefore, the drive current of the NMOS transistor 12 ⁇ can be increased.
- FIGS. 19 is a schematic cross-sectional view illustrating the structure of the semiconductor device according to the present embodiment
- FIG. 20 is a process cross-sectional view illustrating the method for manufacturing the semiconductor device according to the present embodiment
- FIG. 21 is a leakage current of the PMOS transistor in the semiconductor device according to the present embodiment
- 5 is a graph showing driving current. Note that the same components as those of the semiconductor device and the manufacturing method thereof according to the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted or simplified.
- the basic configuration of the semiconductor device according to the present embodiment is substantially the same as that of the semiconductor device according to the first embodiment.
- an impurity having the same conductivity type as that of the source diffusion layer and the drain diffusion layer is further ion-implanted with a direction force inclined toward the drain side with respect to the surface of the semiconductor substrate 10.
- the case where the MOS transistor 12 and the PMOS transistor 12 ⁇ are used will be described.
- An element isolation film 14 that defines an active region is formed on the semiconductor substrate 10.
- a ⁇ -type tool 16 ⁇ is formed in the semiconductor substrate 10 in which the active region is defined.
- a gate electrode 20 is formed on the semiconductor substrate 10 via a gate insulating film 18.
- a sidewall insulating film 22 is formed on the side wall of the gate electrode 20.
- an LDD region 24 ⁇ formed in a self-aligned manner with the gate electrode 20, and an impurity formed in a self-aligned manner with the gate electrode 20 and the sidewall insulating film 22 A ⁇ -type source diffusion layer 28 ⁇ composed of the diffusion region 26 ⁇ is formed.
- an LDD region 30 ⁇ formed by self-alignment with the gate electrode 20 and an impurity diffusion region 32 ⁇ formed by self-alignment with the gate electrode 20 and the sidewall insulating film 22 are formed.
- a ⁇ -type drain diffusion layer 34 ⁇ is formed.
- an inter-force channel region 36 ⁇ between the source diffusion layer 28 ⁇ and the drain diffusion layer 34 ⁇ is obtained.
- a ⁇ -type pocket region 38 ⁇ is formed between the source diffusion layer 28p and the channel region 36n.
- no pocket region is formed between the drain diffusion layer 34 ⁇ and the channel region 36 ⁇ . That is, a pocket impurity non-implanted region 40 is formed between the drain diffusion layer 34 ⁇ and the channel region 36 ⁇ .
- the drain diffusion layer 34 ⁇ has a ⁇ -type impurity diffusion region 58 ⁇ in which the end on the side of the gate electrode 20 shallower than the LDD region 30 ⁇ extends to below the gate electrode 20.
- a silicide film 42 is formed on each of the gate electrode 20, the source diffusion layer 28 ⁇ , and the drain diffusion layer 34 ⁇ .
- the pocket region 38 ⁇ is selectively formed between the source diffusion layer 28 ⁇ and the channel region 36 ⁇ of the S transistor 12 ⁇ , and the drain
- the pocket impurity non-implanted region 40 is between the diffusion layer 34 ⁇ and the channel region 36 ⁇ .
- the drain diffusion layer 34 ⁇ is shallower than the LDD region 30 ⁇ , and the end on the gate electrode 20 side extends to the lower side of the gate electrode 20.
- the ⁇ -type impurity diffusion region 58 ⁇ is formed by ion-implanting ⁇ -type impurities from the direction inclined toward the drain side with respect to the surface of the semiconductor substrate 10 as will be described later.
- the effective channel length of the PMOS transistor 12 ⁇ is shortened by the ⁇ -type impurity diffusion region 58 ⁇ . Therefore, the drive current of the PMOS transistor 12p can be increased.
- FIG. 21 (a) is a graph showing the leakage current of the PMOS transistor in the semiconductor device according to the present embodiment
- FIG. 21 (b) is a graph showing the drive current.
- FIGS. 21 (a) and 21 (b) also show the leakage current and driving current of the PMOS transistor according to the prior art.
- the driving current of the PMOS transistor is increased by about twice that in the case of the conventional technique.
- the leakage current of the PMOS transistor can be reduced and the driving current of the PMOS transistor can be increased.
- LDD regions 24p and 30p are formed in the same manner as in the case of forming the PMOS transistor in the method of manufacturing the semiconductor device according to the first embodiment shown in FIGS. 4 (a) to 5 (b). ( Figure 20 (a)).
- pocket ion implantation of a directional force n-type impurity inclined toward the source side with respect to the surface of the semiconductor substrate 10 is performed to form a pocket region 38 ⁇ (FIG. 20 (b)).
- a directional force n-type impurity inclined toward the source side with respect to the surface of the semiconductor substrate 10 is performed to form a pocket region 38 ⁇ (FIG. 20 (b)).
- phosphorus for example, an acceleration energy of 20 keV, is ion-implanted under the conditions of a dose of 2 X 10 1 3 cm_ 2 as ⁇ -type impurity.
- Arsenic or the like may be used as the n-type impurity.
- the source diffusion layer of the PMOS transistor 12p is obtained. While the pocket region 38 ⁇ is selectively formed between 28p and the channel region 36 ⁇ , the pocket impurity non-implanted region 40 can be formed between the drain diffusion layer 34 ⁇ and the channel region 36 ⁇ . Therefore, GIDL can be reduced for the PMOS transistor 12 ⁇ , and power consumption during standby of the semiconductor device can be reduced.
- the incident angle ⁇ 1 of pocket ion implantation is 0 ° according to the height of the gate electrode 20 and the like.
- the incident angle is, for example, an angle inclined by 30 ° toward the drain side
- boron is used as the p-type impurity, for example, the velocity energy is 15 keV, and the dose is 3 X 10 13 implanted at CM_ 2 conditions.
- Indium or the like may be used as the p-type impurity.
- the p-type impurity ions are implanted from the direction inclined toward the drain side with respect to the surface of the semiconductor substrate 10 to form the p-type impurity diffusion region 58p, whereby the effective channel length of the PMOS transistor 12p is increased. Can be shortened. Therefore, the drive current of the PMOS transistor 12p can be increased.
- the incident angle ⁇ 2 of ion implantation for forming the p-type impurity diffusion region 58p is appropriately set within the range of 0 ° ⁇ 2 90 ° according to the height of the gate electrode 20 and the like. Can do.
- the pocket impurity non-implanted region 40 can be formed. Therefore, GIDL can be reduced for the PMOS transistor 12 ⁇ , and power consumption during standby of the semiconductor device can be reduced.
- the direction force inclined toward the drain side with respect to the surface of the semiconductor substrate 10, ion implantation of ⁇ -type impurities, and the semiconductor substrate 10 on the drain side of the gate electrode 20 are performed.
- the end on the gate electrode 20 side extends to the bottom of the gate electrode 20. Since p is formed, the effective channel length of the PMOS transistor 12p can be shortened. Therefore, the drive current of the PMOS transistor 12p can be increased.
- FIG. 22 is a schematic plan view showing the layout of the SRAM cell in the semiconductor device according to the present embodiment
- FIGS. 23 and 24 are schematic plan views showing the method for manufacturing the semiconductor device according to the present embodiment.
- the same components as those of the semiconductor device and the manufacturing method thereof according to the first to fourth embodiments are denoted by the same reference numerals, and description thereof is omitted or simplified.
- the basic configuration of the semiconductor device according to the present embodiment is substantially the same as that of the semiconductor device according to the second embodiment.
- the NMOS transistor 12 ⁇ according to the third embodiment is applied as the driver transistors Dl and D2 constituting the SRAM cell MC
- the PMOS transistor 12 ⁇ according to the fourth embodiment is applied as the load transistors L1 and L2. It is.
- the load transistors Ll and L2 in contact with P are formed independently of each other, and the source diffusion The layer 28p and the drain diffusion layer 34p are arranged in the same direction, and the P-contact dry transistors Dl and D2 are formed independently of each other so that the source diffusion layer 28 ⁇ and the drain diffusion layer 34 ⁇ are arranged in the same direction. It is arranged in.
- the active region A1 in which the load transistor L1 is formed and the active region ⁇ 2 in which the load transistor L2 is formed are in the element isolation film 14. Are more separated from each other.
- the adjacent load transistors Ll and L2 are formed independently from each other, and the source diffusion layer 28p and the drain diffusion layer 34p of the load transistors Ll and L2 are arranged in the same direction.
- a pocket region is selectively formed between the source diffusion layer 28p and the channel region, and a pocket impurity non-implanted region 40a is formed between the drain diffusion layer 34p and the channel region.
- the load transistors Ll and L2 are the same as the PMOS transistor 12p according to the fourth embodiment.
- the drain diffusion layer 34p is shallower than the LDD region 30p, and the end on the side of the gate electrode 20 is below the gate electrode 20. It has a p-type impurity diffusion region 58p extending to (see Fig. 19).
- the p-type impurities are implanted by ion implantation to form the p-type impurity diffusion region 58p due to the shadow effect of the gate electrodes 20a and 20b.
- the impurity non-implanted region 60a is not implanted.
- the active region A3 in which the driver transistor D1 is formed and the active region A4 in which the driver transistor D2 is formed are separated from each other by the element isolation film 14.
- the adjacent driver transistors Dl and D2 are formed independently of each other, and the source diffusion layers 28 ⁇ and the drain diffusion layers 34 ⁇ of the driver transistors Dl and D2 are arranged in the same direction.
- a pocket region is selectively formed between the source diffusion layer 28 ⁇ and the channel region, and a pocket impurity non-implanted region 40b is formed between the drain diffusion layer 34 ⁇ and the channel region.
- the driver transistors Dl and D2 are similar to the NMOS transistor 12 n according to the third embodiment in that the drain diffusion layer 34 ⁇ is shallower than the LDD region 30 ⁇ , and the end on the side of the gate electrode 20 is below the gate electrode 20 It has an extended ⁇ -type impurity diffusion region 58 ⁇ (see Fig. 17).
- the semiconductor substrate 10 on the source side of the gate electrodes 20a and 20b of the driver transistors Dl and D2 is implanted with ⁇ -type impurities by ion implantation to form an n-type impurity diffusion region 58 ⁇ due to the shadow effect of the gate electrodes 20a and 20b.
- the impurity-unimplanted region 60b is not formed.
- the active region A5 in which the transfer transistor T1 is formed is connected to the active region A3 in which the transistor D1 is formed and connected.
- the active region A6 in which the transfer transistor T2 is formed is connected to the active region A4 in which the driver transistor D2 is formed.
- the load transistor L1 and the driver transistor D1 have a common gate electrode 20a.
- the load transistor L2 and the dry transistor D2 have a common gate electrode 20b.
- the transfer transistors T1 and T2 have a common gate electrode 20c.
- the SRAM cell MC shown in FIG. 22 is repeatedly arranged in the row direction and the column direction similarly to the semiconductor device according to the second embodiment shown in FIG. 10, and constitutes a memory cell array.
- the semiconductor device according to the present embodiment is formed independently of the load transistors Ll and L2 adjacent to each other in the SRA M cell MC, and includes the source diffusion layer 28p and the drain. Diffusion layer 34p is arranged in the same direction, adjacent driver transistors Dl and D2 are formed independently of each other, and source diffusion layer 28 ⁇ and drain diffusion layer 34 ⁇ are arranged in the same direction.
- the main feature is that As a result, since the load transistors Ll and L2 and the driver transistors Dl and D2 can be pocketed from one direction inclined to the source side with respect to the surface of the semiconductor substrate 10, the GIDL can be reduced and the semiconductor can be reduced. The ability to reduce power consumption when the equipment is on standby can be achieved.
- the drain diffusion layer 34p of the load transistors Ll and L2 is shallower than the LDD region 30p.
- the main feature is that it has an impurity diffusion region of 58 ⁇ (see Fig. 17).
- the load diffusion layers Ll and L2 and the driver transistors Dl and D2 are arranged so that the source diffusion layer and the drain diffusion layer are aligned in the same direction. For this reason, p-type impurity ions are implanted into the load transistors Ll and L2 from the direction inclined to the drain side with respect to the surface of the semiconductor substrate 10.
- the n-type impurity diffusion region 58p can be formed by forming the n-type impurity diffusion region 58p and ion-implanting n-type impurities for the driver transistors Dl and D2. As a result, the effective channel length of the load transistors Ll and L2 and the driver transistors Dl and D2 can be shortened, and the drive current can be increased.
- gate electrodes 20a, 20b, and 20c are formed in the same manner as in the semiconductor device manufacturing method according to the second embodiment shown in FIGS. 12 (a) to 13 (a).
- ion implantation for forming an LDD region is performed on the load transistors Ll and L2, the driver transistors Dl and D2, and the transfer transistors Tl and ⁇ 2.
- Ion implantation for forming the LDD region is divided into a region where a PMOS transistor is formed and a region where an NMOS transistor is formed using a photoresist film formed by lithography as a mask.
- the ion implantation for forming the LDD region may be performed with a directional force inclined toward the source side or the drain side with respect to the surface of the semiconductor substrate 10.
- a photolithography technique is used to cover a region where the load transistors Ll and L2 and the transfer transistors Tl and ⁇ 2 are formed, and to expose a photoresist film exposing the region where the driver transistors Dl and D2 are formed.
- the driver transistor Dl, D2 has a gap between the drain diffusion layer 34 ⁇ and the channel region. Due to the shadow effect of the gate electrodes 20a and 20b, a pocket impurity non-implanted region 40b is formed.
- the driver transistors Dl and D2 that are in contact with P are formed independently of each other, and the source diffusion layer 28 ⁇ and the drain diffusion layer 34 ⁇ are arranged in the same direction, so that the dry transistor Dl , D2 tilts toward the source side with respect to the surface of the semiconductor substrate 10 Pocket ion implantation can be performed from one oblique direction.
- the directional force inclined toward the drain side with respect to the surface of the semiconductor substrate 10 is also n-type impurity using the photoresist film and the gate electrodes 20a, 2O as a mask. Ions are implanted (Fig. 23 (b)).
- the gate electrode 20 side shallower than the LDD region 30 ⁇ extends into the semiconductor substrate 10 on the drain side of the gate electrodes 20a and 20b of the driver transistors Dl and D2, and the end of the gate electrode 20 extends below the gate electrode 20.
- a diffusion region 58 ⁇ (see Fig. 18 (c)) is formed.
- n-type impurities are implanted by ion implantation to form an n-type impurity diffusion region 58 ⁇ due to the shadow effect of the gate electrodes 20a and 20b. Implanted regions become undoped regions 60b.
- the n-type impurity ion implantation is performed with the direction force inclined to the drain side with respect to the surface of the semiconductor substrate 10 to form the n-type impurity diffusion region 58 ⁇ , thereby effectively reducing the driver transistors Dl and D2.
- the channel length can be shortened. Therefore, the drive current of the driver transistors Dl and D2 can be increased.
- driver transistors Dl and D2 For driver transistors Dl and D2, p-type impurity pocket ion implantation and n-type impurity ion implantation are performed, and then the photoresist film used as a mask is removed.
- a photolithography technique is used to cover a region where the driver transistors Dl and D2 and the transfer transistors Tl and ⁇ 2 are formed and to expose a region where the load transistors Ll and L2 are formed.
- a pocket impurity non-implanted region 40a is formed by the shadow effect of the gate electrodes 20a and 20b.
- P-contact load transistors Ll and L2 are formed independently of each other. Since the source diffusion layer 28p and the drain diffusion layer 34p are arranged in the same direction, pocket ion implantation is performed from one direction in the direction inclined toward the source side with respect to the surface of the semiconductor substrate 10 for the load transistors Ll and L2. It can be performed.
- the p-type impurity is tilted from the direction inclined toward the drain side with respect to the surface of the semiconductor substrate 10. Ions are implanted (Fig. 24 (b)). As a result, the p-type impurity diffusion in which the gate electrode 20 side end shallower than the LDD region 30p extends to the bottom of the gate electrode 20 in the semiconductor substrate 10 on the drain side of the gate electrodes 20a and 20b of the load transistors Ll and L2 Region 58p (see Figure 20 (c)) is formed.
- the p-type impurities by ion implantation for forming the p-type impurity diffusion region 58p are caused by the shadow effect of the gate electrodes 20a and 20b. This is a non-implanted impurity-injected region 60a.
- the load transistors Ll and L2 and the driver transistors D1 and D2 are arranged so that the source diffusion layer and the drain diffusion layer are arranged in the same direction, thereby providing a semiconductor substrate. 10 Since the bucket ion implantation is performed from one direction inclined to the source side with respect to the surface, GIDL can be reduced and the power consumption during standby of the semiconductor device can be reduced.
- ion implantation of p-type impurities is performed on the load transistors Ll and L2 from the direction inclined toward the drain side with respect to the surface of the semiconductor substrate 10, and the gate electrode side end A P-type impurity diffusion region is formed that extends to the bottom of the gate electrode.
- n-type impurity ions are implanted to form an n-type impurity diffusion region with the gate electrode end extending under the gate electrode, so that the load transistors Ll and L2 and the dry transistor Dl For D2, the effective channel length can be shortened and the drive current can be increased.
- the present invention is applied to the SRAM circuit as in the second embodiment.
- the present invention may be applied to a logic circuit, a CPU circuit, a peripheral circuit, and the like. .
- the SRAM cell layout is changed in the same manner as the modification of the second embodiment shown in FIG. 15, and not only the load transistors Ll and L2 and the driver transistors Dl and D2, but also the transfer transistors Tl and ⁇ 2.
- the pocket ion implantation is performed from one direction inclined to the source side with respect to the surface of the semiconductor substrate 10, and the direction force ⁇ type impurity inclined to the drain side with respect to the surface of the semiconductor substrate 10 can be performed. You may be able to do it.
- a direction inclined toward the source side with respect to the surface of the semiconductor substrate 10 is described.
- Pocket ion implantation may be performed from the direction inclined toward the drain side.
- pocket ion implantation may be performed from a direction inclined toward the drain side with respect to the surface of the semiconductor substrate 10.
- the pocket ion implantation for forming the pocket region is performed from the direction inclined toward the source side with respect to the surface of the semiconductor substrate 10 .
- the ion implantation may be performed in a direction force inclined toward the source side or the drain side with respect to the surface of the semiconductor substrate 10.
- the LDD region can be selectively formed only in the source diffusion layer. Forming LD D in this way also reduces GIDL and reduces power consumption during standby of semiconductor devices. You can power down.
- the semiconductor device and the manufacturing method thereof according to the present invention can reduce the leakage current of the MIS transistor and increase the driving current in the semiconductor device having a plurality of MIS transistors. Therefore, the semiconductor device and the manufacturing method thereof according to the present invention reduce the standby power consumption of a semiconductor device used for a device that requires a reduction in standby power consumption, such as a battery-driven portable device. This is extremely useful for speeding up operations.
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JP2011165764A (ja) * | 2010-02-05 | 2011-08-25 | Renesas Electronics Corp | 半導体装置の製造方法および半導体装置 |
JP2012023186A (ja) * | 2010-07-14 | 2012-02-02 | Toshiba Corp | 半導体装置 |
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JP2002270825A (ja) * | 2001-03-08 | 2002-09-20 | Hitachi Ltd | 電界効果トランジスタ及び半導体装置の製造方法 |
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JP2011100911A (ja) * | 2009-11-09 | 2011-05-19 | Fujitsu Semiconductor Ltd | 半導体装置とその製造方法 |
JP2011165764A (ja) * | 2010-02-05 | 2011-08-25 | Renesas Electronics Corp | 半導体装置の製造方法および半導体装置 |
JP2012023186A (ja) * | 2010-07-14 | 2012-02-02 | Toshiba Corp | 半導体装置 |
WO2013018156A1 (ja) * | 2011-07-29 | 2013-02-07 | ルネサスエレクトロニクス株式会社 | 半導体装置およびその製造方法 |
US10032781B2 (en) | 2011-07-29 | 2018-07-24 | Renesas Electronics Corporation | Static random access memory device with halo regions having different impurity concentrations |
US10217751B2 (en) | 2011-07-29 | 2019-02-26 | Renesas Electronics Corporation | Static random access memory device with halo regions having different impurity concentrations |
US10510761B2 (en) | 2011-07-29 | 2019-12-17 | Renesas Electronics Corporation | Static random access memory device with halo regions having different impurity concentrations |
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US20080012081A1 (en) | 2008-01-17 |
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