WO2006068027A1 - 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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- WO2006068027A1 WO2006068027A1 PCT/JP2005/023055 JP2005023055W WO2006068027A1 WO 2006068027 A1 WO2006068027 A1 WO 2006068027A1 JP 2005023055 W JP2005023055 W JP 2005023055W WO 2006068027 A1 WO2006068027 A1 WO 2006068027A1
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- polycrystalline semiconductor
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- 238000004519 manufacturing process Methods 0.000 title claims description 58
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- 229910000577 Silicon-germanium Inorganic materials 0.000 description 1
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Classifications
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- H—ELECTRICITY
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- 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
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/43—Electrodes ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/49—Metal-insulator-semiconductor electrodes, e.g. gates of MOSFET
- H01L29/4916—Metal-insulator-semiconductor electrodes, e.g. gates of MOSFET the conductor material next to the insulator being a silicon layer, e.g. polysilicon doped with boron, phosphorus or nitrogen
- H01L29/4925—Metal-insulator-semiconductor electrodes, e.g. gates of MOSFET the conductor material next to the insulator being a silicon layer, e.g. polysilicon doped with boron, phosphorus or nitrogen with a multiple layer structure, e.g. several silicon layers with different crystal structure or grain arrangement
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/82—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
- H01L21/822—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being a semiconductor, using silicon technology
- H01L21/8232—Field-effect technology
- H01L21/8234—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type
- H01L21/8238—Complementary field-effect transistors, e.g. CMOS
- H01L21/823814—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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- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/82—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
- H01L21/822—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being a semiconductor, using silicon technology
- H01L21/8232—Field-effect technology
- H01L21/8234—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type
- H01L21/8238—Complementary field-effect transistors, e.g. CMOS
- H01L21/823828—Complementary field-effect transistors, e.g. CMOS with a particular manufacturing method of the gate conductors, e.g. particular materials, shapes
- H01L21/823842—Complementary field-effect transistors, e.g. CMOS with a particular manufacturing method of the gate conductors, e.g. particular materials, shapes gate conductors with different gate conductor materials or different gate conductor implants, e.g. dual gate structures
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/28008—Making conductor-insulator-semiconductor electrodes
- H01L21/28017—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon
- H01L21/28026—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon characterised by the conductor
- H01L21/28035—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon characterised by the conductor the final conductor layer next to the insulator being silicon, e.g. polysilicon, with or without impurities
- H01L21/28044—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon characterised by the conductor the final conductor layer next to the insulator being silicon, e.g. polysilicon, with or without impurities the conductor comprising at least another non-silicon conductive layer
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
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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
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- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/6653—Unipolar field-effect transistors with an insulated gate, i.e. MISFET using the removal of at least part of spacer, e.g. disposable spacer
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- 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
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- 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
- H01L29/66545—Unipolar field-effect transistors with an insulated gate, i.e. MISFET using a dummy, i.e. replacement gate in a process wherein at least a part of the final gate is self aligned to the dummy gate
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- 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
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- 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
- H01L29/66568—Lateral single gate silicon transistors
- H01L29/66575—Lateral single gate silicon transistors where the source and drain or source and drain extensions are self-aligned to the sides of the gate
- H01L29/6659—Lateral single gate silicon transistors where the source and drain or source and drain extensions are self-aligned to the sides of the gate with both lightly doped source and drain extensions and source and drain self-aligned to the sides of the gate, e.g. lightly doped drain [LDD] MOSFET, double diffused drain [DDD] MOSFET
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- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66568—Lateral single gate silicon transistors
- H01L29/66613—Lateral single gate silicon transistors with a gate recessing step, e.g. using local oxidation
- H01L29/66628—Lateral single gate silicon transistors with a gate recessing step, e.g. using local oxidation recessing the gate by forming single crystalline semiconductor material at the source or drain location
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- 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
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- 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
- H01L29/7833—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
- H01L29/7834—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 a non-planar structure, e.g. the gate or the source or the drain being non-planar
Definitions
- the present invention generally relates to a semiconductor device, and more particularly to a semiconductor device having a polysilicon gate electrode and a manufacturing method thereof.
- MOS transistors are widely used as semiconductor integrated circuit devices.
- the thickness of the gate insulating film is set according to a so-called scaling law. It is important to reduce.
- the density of carriers induced in the channel region of the MOS transistor is proportional to the gate capacitance, but the gate capacitance is inversely proportional to the thickness of the gate insulating film, and thus the thickness of the gate insulating film is reduced.
- the current driving capability increases.
- the electric field induced directly below the gate electrode by the gate electrode is distributed to the gate insulating film and a depletion layer formed in the channel region under the gate insulating film. By reducing it, the electric field applied to the depletion layer increases, and the short channel effect can be effectively suppressed.
- Patent Document 1 Japanese Patent Laid-Open No. 2001-068662
- Patent Document 2 Japanese Patent Laid-Open No. 06-244136
- a conventional MOS transistor and its manufacturing process will be outlined with an n-channel MOS transistor as an example.
- an element isolation region 42 is formed on a p-type silicon substrate 41 so as to define an element region, and a p-type well 43 is further formed in the element region. Further, an insulating film 44 having a thickness of 2 nm, for example, is formed on the surface of the silicon substrate 41 as a gate insulating film by performing a thermal oxidation process and a heat treatment in a nitrogen atmosphere.
- a polysilicon film having a thickness of about lOOnm is deposited on the entire surface of the silicon substrate 41 by the CVD method so as to cover the insulating film 44, and P (lin) is further added as a dopant impurity element.
- a polysilicon gate electrode pattern with a gate length of 60 nm is obtained by ion-implanting with a dose of 6 X 10 15 cm- 2 under the acceleration energy of lOkeV and patterning the resulting polysilicon film. 45 is formed.
- P or As (arsenic) ions are implanted into the silicon substrate 41 using the polysilicon gate electrode pattern 45 as a mask, and a pair of p-type wells 43 is formed on both sides of the gate electrode 45.
- the n-type extension diffusion region 46 is formed.
- a pair of side wall insulating films 47 are formed on both sides of the gate electrode pattern 45, and a layer with P is used with the gate electrode pattern 45 and the pair of side wall insulating films as a mask.
- n + -type diffusion regions 48 to be the source and drain regions of the p-channel MOS transistor are formed outside the sidewall insulating films.
- the thus implanted ion-implanted structure is subjected to rapid thermal processing (RTA) at a temperature of 1000 ° C to activate the implanted impurity element.
- RTA rapid thermal processing
- a silicide layer 49 is formed on the surface by a salicide process.
- FIG. 2 is a sectional view of the gate electrode pattern 45 taken along the line AA ′ in FIG. 1, ie, in the gate width direction.
- the gate electrode pattern 45 is composed of a single-layer polysilicon film, and the polysilicon film is composed of columnar Si crystal grains extending from the upper surface to the lower surface. You can see that In the polysilicon film having such a microstructure, the crystal grain boundary 51 of the Si crystal also extends continuously from the upper surface to the lower surface of the polysilicon film.
- the grain size of such columnar Si crystal grains varies depending on the thickness of the formed polysilicon film.
- the grain size of the Si crystal grains also increases as shown in FIG. 3A.
- the thickness of the polysilicon film is small, as shown in FIG.
- the particle size also decreases.
- Such film thickness dependence of the Si crystal grain size is particularly noticeable when the polysilicon film thickness is less than lOOnm.
- reducing the thickness of the polysilicon gate electrode pattern 45 is effective in improving the TDDB characteristics of the MOS transistor.
- the gate insulating film important for the operation of the MOS transistor is affected when the silicide layer 49 is formed. .
- the silicide layer 49 on the gate electrode pattern 45 is formed simultaneously with the silicide layer 49 on the source / drain region 48, it is difficult to simply reduce the thickness of the polysilicon gate electrode pattern 45. It can be seen that it is. (That is, if the thickness of the gate electrode pattern 45 is too small, the distance between the silicide layer 49 on the source / drain region 48 separated by the sidewall insulating film 47 and the silicide layer 49 on the gate electrode pattern 45 is too short. This increases the risk of a short circuit.) On the other hand, as shown in FIG.
- the formation of the polysilicon film is performed in two stages. First, the lower polysilicon film 52 is formed thin, and then the upper polysilicon film 53 is formed thick. A technique is known in which the grain size of the Si crystal grains 50 is suppressed in the lower polysilicon film 52, and a microstructure is formed in the upper polysilicon film 53 to increase the grain diameter of the Si crystal grains 50.
- the crystal grain boundary 51 continuously extends from the upper part to the lower part of the film 53 in the upper polysilicon film 53, and the crystal grain boundary 51 is also formed in the lower polysilicon film 52.
- the film 52 extends continuously from the top to the bottom.
- the technique shown in FIG. 4 controls the grain size of Si crystal grains in the film by controlling the thickness of the polysilicon film.
- the polysilicon film having such a structure is used as a gate electrode. It has been proposed to improve the TDDB characteristics of MOS transistors by using them.
- Patent Document 1 a thin amorphous silicon film is formed on a gate insulating film, and this is crystallized to be converted into a polysilicon film made of Si crystal grains having a small grain size. Further, a technique is described in which a thicker polysilicon film is formed with a larger crystal grain size, and impurity elements are ion-implanted into the two-layered polysilicon film thus obtained.
- Patent Document 2 a process of depositing and crystallizing a doped thin amorphous silicon film is repeated, and a stress-relieved polysilicon gate electrode film made of a polysilicon film having a small grain size is formed. The technique to obtain is described.
- FIGS. 5A to 5C show a case where an impurity element is ion-implanted with relatively low energy after a polysilicon film having a two-layer structure similar to that in FIG. 4 is first formed.
- FIG. 5A first, after depositing a thin undoped polysilicon film 52 made of Si crystal grains with a small grain size on the gate insulating film 44, A thick non-doped polysilicon film 53 is deposited, and in the process of FIG. 5B, P is ion-implanted into the double-layered polysilicon film thus formed with low acceleration energy.
- the introduced P is the lower part of the upper polysilicon film 53 as shown in FIG. 5B.
- the upper part of the polysilicon film 53 into which the P has been introduced changes to an amorphous state 54 as a result of ion implantation.
- the amorphous state portion 54 is crystallized, and the initial polysilicon layer 53 is formed in the amorphous state portion 54.
- the polysilicon layer 55 is made of Si crystal grains having a grain size larger than that of the initial polysilicon film 53.
- P diffuses from the amorphous portion 54 and is doped into an n + type including the entire force of the initial polysilicon film 53 up to the lower portion of the polysilicon layer 55.
- the diffusion of the impurity element from the impurity implantation region 54 does not reach or slightly reaches the lower polysilicon film 52. Therefore, the lower polysilicon film 52 Inside, n-type impurity elements cannot be introduced at a sufficient concentration.
- FIG. 6A when ion implantation is performed to a deep position with a large energy, as shown in FIG. 6B, the overall force amorphous state 57 of the upper polysilicon film 53 is obtained. Then, when the amorphous film 57 is crystallized, as shown in FIG. 6C, the entire amorphous layer 57 is crystallized, and a single-layer polysilicon film 58 having a large grain size is formed. Will be formed.
- An object of the present invention is to provide a semiconductor device capable of suppressing depletion of a polysilicon gate electrode without complicating the manufacturing process and improving TDDB characteristics, and a manufacturing method thereof.
- the present invention further provides a semiconductor device that can suppress the short channel effect without complicating the manufacturing process and a manufacturing method thereof in the semiconductor device having the above characteristics.
- the present invention provides a substrate, a first element region of a first conductivity type and a second element region of a second conductivity type formed on the substrate.
- An element isolation structure that defines a first polycrystalline silicon layer, and a stacked structure in which a lower polycrystalline semiconductor layer and an upper polycrystalline semiconductor layer are sequentially stacked in the first element region via a gate insulating film.
- a first polycrystalline semiconductor gate electrode structure doped to a first conductive type, and a structure in which a lower polycrystalline semiconductor layer and an upper polycrystalline semiconductor layer are sequentially stacked in the second element region through a gate insulating film.
- a second polycrystalline semiconductor gate electrode structure having a layer structure and doped to the first conductivity type, and formed on both sides of the first gate electrode structure in the first element region; A pair of diffusion regions having the second conductivity type; and the second gate in the second element region. And a pair of diffusion regions having the first conductivity type formed on both sides of the electrode structure, and in each of the first and second polycrystalline semiconductor gate electrode structures, the lower polycrystalline semiconductor layer.
- the semiconductor crystal grains constituting the upper polycrystalline semiconductor layer have a grain size smaller than that of the upper polycrystalline semiconductor layer, and in each of the first and second polycrystalline semiconductor gate electrode structures, the lower polycrystalline grains are formed.
- the crystalline semiconductor layer provides a semiconductor device having a dopant concentration equal to or higher than that of the upper polycrystalline semiconductor layer.
- the present invention provides a substrate, a first element region of the first conductivity type and a second element region of the second conductivity type formed on the substrate.
- An element isolation structure that defines a first polycrystalline silicon layer, and a stacked structure in which a lower polycrystalline semiconductor layer and an upper polycrystalline semiconductor layer are sequentially stacked in the first element region via a gate insulating film.
- a first polycrystalline semiconductor gate electrode structure doped to a first conductive type, and a structure in which a lower polycrystalline semiconductor layer and an upper polycrystalline semiconductor layer are sequentially stacked in the second element region through a gate insulating film.
- a second polycrystalline semiconductor gate electrode structure having a layer structure and doped to the first conductivity type, and formed on both sides of the first gate electrode structure in the first element region; A pair of diffusion regions having the second conductivity type; and the second gate in the second element region. And a pair of diffusion regions having the first conductivity type formed on both sides of the electrode structure, and in each of the first and second polycrystalline semiconductor gate electrode structures, the lower polycrystalline semiconductor layer.
- the semiconductor crystal grains constituting the upper polycrystalline semiconductor layer have a grain size smaller than that of the upper polycrystalline semiconductor layer, and in each of the first and second polycrystalline semiconductor gate electrode structures, the lower polycrystalline grains are formed.
- the crystalline semiconductor layer provides a semiconductor device characterized by having a dopant concentration of 1 ⁇ 10 2 ° cm ⁇ 3 or more.
- the present invention provides a substrate, a first element region of a first conductivity type, and a second element of a second conductivity type formed on the substrate.
- An element isolation structure that defines a region; and a stacked structure in which a lower polycrystalline semiconductor layer and an upper polycrystalline semiconductor layer are sequentially stacked in the first element region via a gate insulating film, A first polycrystalline semiconductor gate electrode structure doped to conductivity type 2 and a second polycrystalline semiconductor layer and an upper polycrystalline semiconductor layer, which are formed in the second element region via a gate insulating film, sequentially stacked;
- a second polycrystalline semiconductor gate electrode structure doped with the first conductivity type and having a laminated structure, and formed on both sides of the first gate electrode structure in the first element region; A pair of diffusion regions having the second conductivity type, and the second element region, And a pair of diffusion regions having the first conductivity type formed on both sides of the gate electrode structure.
- the lower polycrystalline semiconductor In each of the first and second polycrystalline semiconductor gate electrode structures, the lower polycrystalline semiconductor The semiconductor crystal grains constituting the layer have a grain size smaller than the semiconductor crystal grains constituting the upper polycrystalline semiconductor layer, and the first and second polycrystalline semiconductors In each of the gate electrode structures, the lower polycrystalline semiconductor layer has a thickness smaller than that of the upper polycrystalline semiconductor layer.
- the present invention provides a step of forming a first polycrystalline semiconductor film on a substrate via a gate insulating film, and the first polycrystalline semiconductor film is ionized.
- a crystalline semiconductor film to form a gate electrode structure in which the first and second polycrystalline semiconductor films are stacked; and using the gate electrode structure as a mask in the substrate, the first impurity element and Impurity elements of the same conductivity type are introduced by ion implantation, and source and drain diffusion regions doped to the first conductivity type are formed on both sides of the gate electrode structure.
- the second polycrystalline semiconductor film To provide a method of manufacturing a semiconductor device which comprises the steps of: doping a first conductivity type, the.
- the present invention provides a step of forming a first polycrystalline semiconductor film on a semiconductor substrate via a gate insulating film, and the first polycrystalline semiconductor film is ionized.
- a step of doping with an impurity element of a first conductivity type by an implantation method a step of depositing a dummy insulating film on the first polycrystalline semiconductor film; and the first polycrystalline semiconductor film and the first polycrystalline semiconductor film Patterning a dummy insulating film and forming a dummy gate pattern; forming a dummy sidewall insulating film on both side walls of the dummy gate pattern; and selecting the dummy insulating film with respect to the dummy sidewall insulating film Etching and removing to expose the first polycrystalline semiconductor film, and selectively growing a semiconductor layer on both sides of the dummy sidewall insulating film on the semiconductor substrate to form source and drain regions.
- a step of selectively growing a second polycrystalline semiconductor layer on the first polycrystalline semiconductor layer to form a stacked gate electrode structure, and introducing an impurity element into the source and drain regions by ion implantation A step of forming source and drain diffusion regions in the source and drain regions, and a step of simultaneously introducing the impurity element into the second polycrystalline semiconductor layer by an ion implantation method. Providing a manufacturing method.
- the invention's effect it is possible to realize a semiconductor device in which depletion of the polysilicon gate electrode without complicating the manufacturing process is suppressed, and at the same time, deterioration of TDDB characteristics is suppressed.
- a semiconductor device since the polysilicon gate electrode is doped by S ion implantation, according to the present invention, for example, a CMOS element having a polysilicon gate having a different conductivity type can be manufactured by a simple process. It becomes possible.
- the source / drain regions are formed on the semiconductor substrate by regrowth simultaneously with the formation of the upper polysilicon layer in the polysilicon gate electrode having the multilayer structure.
- the regrowth source / drain region is formed at a position higher than the substrate surface and doping the regrowth source / drain region to a desired conductivity type by ion implantation, the lower end of the source / drain diffusion region is positioned near the surface of the silicon substrate. It is possible to effectively suppress the short channel effect.
- FIG. 1 is a schematic diagram showing a configuration of a MOS transistor according to a related technique of the present invention.
- FIG. 2 is an enlarged view of the AA cross section of FIG.
- FIG. 3A is a diagram (part 1) for explaining the film thickness dependence of crystal grain size.
- FIG. 3B is a diagram (part 2) for explaining the film thickness dependence of the crystal grain size.
- FIG. 4 is a diagram showing the structure of a multilayer polysilicon film obtained by a two-stage growth process according to the related art of the present invention.
- FIG. 5A is a diagram (part 1) for explaining problems of the related art of the present invention.
- FIG. 5B is a diagram (part 2) for explaining problems of the related art of the present invention.
- FIG. 5C is a diagram (part 3) for explaining problems of the related art of the present invention.
- FIG. 6A is another diagram (part 1) for explaining problems of the related art of the present invention.
- FIG. 6B is another diagram (part 2) for explaining problems of the related art of the present invention.
- FIG. 6C is another view (No. 3) for explaining the problems of the related art of the present invention.
- FIG. 7 is a diagram for explaining the principle of the present invention.
- FIG. 8 is another diagram for explaining the principle of the present invention.
- FIG. 9A is a view (No. 1) showing a step of manufacturing a CMOS element according to the first embodiment of the present invention.
- FIG. 9B is a view (No. 2) showing a step of manufacturing the CMOS element according to the first embodiment of the present invention.
- FIG. 9C is a view (No. 3) showing a step of manufacturing the CMOS element according to the first embodiment of the present invention.
- FIG. 9D is a view (No. 4) showing a step of manufacturing the CMOS element according to the first embodiment of the present invention.
- FIG. 9E is a view (No. 5) showing a step of manufacturing the CMOS element according to the first embodiment of the present invention.
- FIG. 9F is a view (No. 6) showing a process for manufacturing a CMOS element according to the first embodiment of the present invention.
- FIG. 9G is a view (No. 7) showing a step of manufacturing a CMOS element according to the first embodiment of the present invention.
- FIG. 9H is a view (No. 8) showing a step of manufacturing the CMOS element according to the first embodiment of the present invention.
- FIG. 91 is a view (No. 9) showing a manufacturing step of the CMOS element according to the first embodiment of the present invention.
- FIG. 9J is a view (No. 10) showing a step of manufacturing the CMOS element according to the first embodiment of the present invention.
- FIG. 9K is a view (No. 11) showing a process for manufacturing a CMOS element according to the first embodiment of the present invention.
- FIG. 9L is a diagram (No. 12) showing a process for manufacturing a CMOS element according to the first embodiment of the present invention.
- FIG. 9M is a view (No. 13) showing a process for manufacturing a CMOS element according to the first embodiment of the present invention.
- FIG. 9N is a view (No. 14) showing a step of manufacturing the CMOS element according to the first embodiment of the present invention.
- FIG. 90 is a view (No. 15) showing a step of manufacturing the CMOS element according to the first embodiment of the present invention.
- FIGS. 16A to 16D are diagrams showing a process for manufacturing a CMOS device according to the first embodiment of the present invention (No. 16).
- FIG. 10A A diagram illustrating a manufacturing process of an n-channel MOS transistor according to the second embodiment of the present invention (No. 1).
- FIG. 10A A diagram illustrating a manufacturing process of an n-channel MOS transistor according to the second embodiment of the present invention (No. 1).
- FIG. 10A A diagram illustrating a manufacturing process of an n-channel MOS transistor according to the second embodiment of the present invention (No. 1).
- Fig. 10B is a diagram (No. 2) showing a manufacturing process of the n-channel MOS transistor according to the second embodiment of the present invention.
- FIG. 10C A diagram (part 3) illustrating a manufacturing process of the n-channel MOS transistor according to the second embodiment of the present invention.
- FIG. 10D A diagram showing a manufacturing process of the n-channel MOS transistor according to the second embodiment of the present invention (No. 4).
- FIG. 10E A diagram (part 5) showing a manufacturing process of the n-channel MOS transistor according to the second embodiment of the present invention.
- FIG. 10F (No. 6) showing a manufacturing process of the n-channel MOS transistor according to the second embodiment of the present invention.
- FIG. 10G A diagram showing a manufacturing process of the n-channel MOS transistor according to the second embodiment of the present invention (No. 7).
- FIG. 11A A diagram showing a manufacturing process of an n-channel MOS transistor according to the third embodiment of the present invention (part 1).
- FIG. 11B A diagram (part 2) illustrating a manufacturing process of the n-channel MOS transistor according to the third embodiment of the present invention.
- FIG. 11C A diagram showing a manufacturing process of the n-channel MOS transistor according to the third embodiment of the present invention (part 3).
- FIG. 11D A diagram showing a manufacturing process of the n-channel MOS transistor according to the third embodiment of the present invention (No. 4).
- FIG. 11E A diagram showing a manufacturing process of the n-channel MOS transistor according to the third embodiment of the present invention (No. 5).
- FIG. 11F A diagram showing a manufacturing process of the n-channel MOS transistor according to the third embodiment of the present invention (No. 6).
- FIG. 11G A diagram showing a manufacturing process of the n-channel MOS transistor according to the third embodiment of the present invention (No. 7).
- FIG. 11G A diagram showing a manufacturing process of the n-channel MOS transistor according to the third embodiment of the present invention (No. 7).
- FIG. 11 II (No. 9) showing a manufacturing process of the n-channel MOS transistor according to the third embodiment of the present invention.
- FIG. 11J A diagram showing a manufacturing process of the n-channel MOS transistor according to the third embodiment of the present invention (No. 10).
- FIG. 11K A diagram showing an n-channel MOS transistor manufacturing process according to the third embodiment of the present invention (part 11).
- FIGS 7 and 8 illustrate the principles of the present invention.
- an element region 1A is defined on the semiconductor substrate 1 by the element isolation structure II, and the gate insulating film 2 is formed on the silicon substrate 1 in the element region 1A.
- a polycrystalline semiconductor gate electrode 3 is formed.
- source and drain extension regions 7a and 7b are formed in the semiconductor substrate 1 so as to correspond to a pair of side wall surfaces of the polycrystalline semiconductor gate electrode 3 facing each other.
- Source and drain regions 7A and 7B are formed outside the side wall insulating films formed on the respective side wall surfaces of the polycrystalline semiconductor gate electrode 3 in succession to the source and drain extension regions 7a and 7b, respectively. ing.
- the polycrystalline semiconductor gate electrode 3 includes a lower polycrystalline semiconductor layer 4 having a small film thickness and a small crystal grain size, and the lower polycrystalline semiconductor.
- the upper polycrystalline semiconductor layer 5 is formed on the layer 4 and has a large film thickness and a large crystal grain size.
- the lower polycrystalline semiconductor layer 4 is higher than the upper polycrystalline semiconductor layer 5. Doped with impurity concentration.
- the lower polycrystalline semiconductor layer 4 of the polycrystalline semiconductor gate electrode 3 is formed in such a manner that the crystal grain size in the semiconductor layer 4 is higher than that of the upper polycrystalline semiconductor layer 5.
- 90% of the crystal grains in the semiconductor layer 4 are formed so as to have a grain size of 10 to 50 nm so that the deterioration of the TDDB characteristics is suppressed, so that the crystal grain size becomes smaller than the crystal grain size.
- the problem that the impurity element in the electrode 3 enters the channel region through the gate insulating film 2 is suppressed.
- the polycrystalline semiconductor layer 4 may be formed to a thickness of 10 to 50 nm.
- the dopant concentration of the lower polycrystalline semiconductor layer 4 in contact with the gate insulating film 2 is higher than the dopant concentration of the upper polycrystalline semiconductor layer 5.
- the present invention uses B as a dopant element. It is also effective for the p-type semiconductor device used. Further, the lower polycrystalline semiconductor layer 4 and the upper polycrystalline semiconductor layer 5 are doped with P-type or n-type after film formation of the respective layers by ion implantation to form C MOS on a single semiconductor substrate. A dual gate semiconductor device such as an element can be easily formed.
- a thermal oxide film 12 having a thickness of lOnm and a nitridation having a thickness of lOOnm are formed on a p-type silicon substrate 11 having a (100) plane orientation with a specific resistance of 10 ⁇ ′ cm.
- a silicon film 13 is sequentially formed, and in the step of FIG. 9B, the nitride film is formed using the resist pattern 14 as a mask.
- an element isolation groove 15 having a depth of, for example, 250 nm is formed on the silicon substrate 11.
- the element regions 11 A and 11B have n channels, as will be described later.
- the resist pattern 14 is removed, and the entire substrate 11 is further subjected to heat treatment in an oxidizing atmosphere to form a thermal oxide film 16 on the surface of the element isolation trench 15, typically.
- an SiO film is deposited to a thickness of, for example, 500 nm on the silicon substrate 11 so as to fill the element isolation trench 15 by high-density plasma CVD.
- the silicon nitride film 13 and the thermal oxide film 12 are used as a stagger, and the SiO film 12 on the silicon substrate 11 is removed by a CMP (chemical mechanical polishing) method, and then the silicon nitride film 13 and the SiO film 12 is removed by etching. Thereby, the element isolation region 17 is formed.
- CMP chemical mechanical polishing
- a resist pattern R1 exposing the element region 11A is formed on the structure of FIG. 9C, and B + is accelerated energy of 120 kev using the resist pattern R1 as a mask.
- ion implantation is performed at a dose of 2 to 3 X 10 13 cm- 2 .
- a resist pattern R2 that exposes the element region 11B is formed.
- P is 2 to 3 ⁇ 10 13 cm ⁇ 2 under an acceleration energy of 300 keV. Ions are implanted at a dose.
- step of FIG. 9F after removing the resist pattern R2, heat treatment is performed at a temperature of 950 to 100 ° C. for 10 to 30 seconds, and the respective impurity elements introduced into the tools 18A and 18B are removed.
- a p-type well 18A is formed in the element region 11A
- an n-type wall 18B is formed in the element region 11B.
- an appropriate amount of B + and P + ions are implanted into the element regions 11A and 11B, respectively, in order to adjust the threshold value, and then thermal oxidation is performed at a temperature of 800 to 900 ° C.
- a thermal oxide film having a thickness of 2 nm is formed, and further heat-treated in a nitrogen atmosphere, whereby the thermal oxide film is nitrided to form a SiON gate insulating film 19.
- the positive silicon film 20 is deposited by a low pressure CVD method at a substrate temperature of 580 to 620 ° C., and in the case of 600 ° C. Is deposited to a thickness of 10-50 nm, for example 30 nm.
- Si crystal grains having a grain size of 10 to 50 nm, which is substantially equal to the film thickness, are formed in the film, as in FIG. 3B described above.
- a resist pattern R3 that exposes the element region 11A is formed on the polysilicon film 20, and P ions 21A are 3 to 30 keV, 3 to 30 keV, using the resist pattern R3 as a mask.
- ion implantation is carried out at a dose of 2 x 10 15 cm 2 , if the lOkeV is under the power of Noregi:! ⁇ 3 x 10 15 cm- 2 .
- the portion 22A into which the P ions are introduced in the polysilicon film 20 changes to an amorphous state.
- a resist pattern R4 exposing the element region 11B is formed on the polysilicon film 20, and B ions 21B are formed using the resist pattern R4 as a mask, from 1 to: 10 keV, for example, 5 keV. 1 to 3 X
- ions are implanted at a dose of 2 X 10 15 cm- 2 .
- the portion 22B into which the B ions are introduced in the polysilicon film 20 changes to an amorphous state.
- the structure of FIG. 9H is heat-treated at a temperature of 500 ° C. or higher, for example, 1000 ° C. Activates ions.
- the silicon film 20 including the amorphous regions 22A and 22B is crystallized and converted into the polysilicon film 23 including the n-type region 23A and the p-type region 23B as shown in FIG.
- the Si crystal grains constituting the film 23 have a force that is slightly larger than the Si crystal grains in the polysilicon film 20.
- 100% of Si crystal grains are approximately equal to the film thickness of the polysilicon film 23 as in the case of the polysilicon film 20, and have a particle diameter of 10 to 50 nm. Such a particle size distribution is confirmed by observing a vertical cross section of the polysilicon film 23.
- the polysilicon film 24 force 80 to 620 is further formed on the structure of FIG. 91 by the low pressure CVD method.
- C for example 600.
- the film thickness is 50 to 100 nm, for example, 70 nm.
- the thickness of the polysilicon film 24 is not limited to that of the polysilicon.
- the total film thickness of the silicon film 23 and the polysilicon film 24 is set to be lOOnm. Since the polysilicon film 24 has a larger film thickness than the polysilicon film 23 therebelow, the Si crystal grains in the film 24 are characterized by a larger grain diameter than the Si crystal grains in the polysilicon film 23. And In this embodiment, the polysilicon film 24 is not doped.
- the polysilicon S 23 and 24 are patterned using a resist pattern (not shown) having a width of, for example, 60 nm as a mask, and the n region is filled with the n region.
- a polysilicon gate electrode structure 24GA of the channel MOS transistor is formed as a stack of the n-type doped polysilicon film 23A and the polysilicon film 24A formed on the gate insulating film 19.
- the element region 11B includes a polysilicon gate electrode structure 24GB force S of the p-channel MOS transistor, the P-type doped polysilicon film 23B and the polysilicon film formed on the gate insulating film 19. It is formed as a laminate of 24B.
- the SiON gate insulating film 19 is also patterned in the patterning process of the polysilicon pattern.
- a resist pattern R5 exposing the element region 11A is formed, and using the resist pattern R5 and the laminated polysilicon gate structure 24GA as a mask, P ions 25A are formed in the element region 11A.
- the type diffusion regions 11a and l ib are formed as the source and drain extension regions of the n-channel MOS transistor, respectively. It can be seen that the upper portion of the polysilicon film 24A is changed to an amorphous state by this ion implantation process.
- a resist pattern R6 exposing the element region 11B is formed.
- the element region 11B is provided with a B pattern 25B. :! ⁇ Under 5 keV calorie speed energy, 5 ⁇ : 10 X 10 14 cm 2 dose, ion-implanted on the surface of the silicon substrate 11, corresponding to both side walls of the laminated polysilicon gate structure 24GB
- the p-type diffusion regions 11c and l id are respectively described above.
- a SiO film having a thickness of 40 to 80 nm is deposited by a high-density plasma CVD method.
- sidewall insulating films 27 are formed on the respective sidewall surfaces of the laminated gate electrode structures 24GA and 24GB. In this deposition process, the entire polysilicon films 24A and 24B are crystallized again.
- a resist pattern R7 exposing the element region 11A is formed on the silicon substrate 11, and the resist pattern R7, the stacked gate electrode structure 24GA, and the sidewall insulating film 27 are formed.
- P ions 28A are ion-implanted at a dose of 5 to 10 ⁇ 10 15 cm— 2 under an acceleration energy of 10 to 20 keV, and outside the side wall insulating film 27 in the element region 11A.
- n + -type source and drain regions 1 le and 1 If are formed.
- the upper polysilicon film 24A in the laminated gate electrode structure 24GA changes to an amorphous state.
- a resist pattern R8 exposing the element region 11B is formed on the silicon substrate 11, and the resist pattern R8, the stacked gate electrode structure 24GB, and the sidewall insulating film 27 are masked.
- B ions 28B are ion-implanted at an acceleration energy of 5 to 10 keV at a dose amount of 4 to 8 ⁇ 10 15 cm— 2 , and p + on the outside of the sidewall insulating film 27 in the element region 11B.
- the upper polysilicon film 24B in the stacked gate electrode structure 24GB changes to an amorphous state.
- the structure of FIG. 9P is heat-treated in a nitrogen atmosphere at a temperature of 1000 to 1050 ° C. for 0 to 10 seconds.
- the impurity element introduced into the silicon substrate 11 is activated.
- the source and drain extension regions l la to l Id are formed, and the source and drain regions l ie to l lh are formed.
- the polysilicon film 24A of the stacked gate electrode structure 24GA and the polysilicon film 24B of the stacked gate electrode structure 24GB which have been changed to the amorphous state, are crystallized again. Further, in the process of FIG.
- a Co film (not shown) is uniformly formed on the structure of FIG. 9Q by sputtering, for example, with a film thickness of 10 nm, and further heat-treated. The film is removed by etching and further heat-treated to form a low-resistance CoSi film 32 on the surface of the polysilicon film 24A in the source and drain regions ie, If and the laminated gate electrode structure 24GA of the n-channel MOS transistor. The At the same time, the CoSi2 film 32 is also formed on the surface of the polysilicon film 24B in the source and drain regions 1lg and lh and the stacked gate electrode structure 24GB of the p-channel MOS transistor.
- an interlayer insulating film is formed on the structure of FIG. 9R, and a via contact structure and an upper wiring structure are formed as necessary, whereby an n-channel MOS transistor and a p-channel M are formed.
- a CMOS device with S transistors connected in series is completed.
- the upper wiring structure is formed on the interlayer insulating film in the form of a multilayer wiring structure using the damascene method, the formation of the wiring trench and the formation of the via hole are made following the formation of the interlayer insulating film.
- a Cu wiring layer is formed so as to fill the wiring trench and via hole. Furthermore, the excess Cu layer on the interlayer insulating film is removed by the CMP method. If you want to form a complicated wiring structure, repeat these processes.
- the lower polysilicon film force in each of the stacked gate electrode structures 24GA and 24GB is converted into the upper polysilicon film with the respective conductivity type impurity elements. Since the ions are implanted with low acceleration energy and high impurity concentration before the film is formed, the depletion problem occurring in the polysilicon gate can be effectively solved.
- the film thickness force S of the lower polysilicon film is small, the crystal grain size can be suppressed to 50 nm or less in these portions, and it becomes possible to simultaneously improve the TDD B characteristics.
- the ion implantation process to the lower polysilicon film is performed as a separate process from the ion implantation process for forming the source and drain regions as shown in FIGS. 9G and 9H. Therefore, the source ion is reduced by reducing the ion implantation energy to suppress the short channel effect. Even when a shallow junction is formed in the rain region, the bottom of the stacked polysilicon gate electrode structure
- the overall height of the laminated gate electrode structure can be set to a height sufficient to form silicide.
- the undoped polysilicon film 34 is patterned in the patterning step of FIG. 9K, the patterning proceeds in the element region 10A and the element region 10B in the same manner. It is possible to avoid the problem that becomes over-etched and the other becomes under-etched.
- the power of the manufactured semiconductor device is a CMOS element.
- CMOS element Hereinafter, only the n-type MOS transistor in the CMOS element will be described.
- an n-type doped polysilicon film 23A corresponding to the element region 11A is formed on the gate insulating film 19 in the same manner as in the steps of FIGS. 9A to 9I. are formed, in the step of FIG. 10B, similarly to the step of FIG. 9J, on the polysilicon film 23A, the polysilicon Tsuki ⁇ 24 forces low pressure CVD method, 580 ⁇ 620 o C, ⁇ Retsumen I or At a substrate temperature of 600 ° C., a film thickness of 50 to: OOnm is formed.
- the process of FIG. 10A similarly to the process of FIG.
- the thickness of the polysilicon film 24 is larger than the thickness of the polysilicon film 23A and the total thickness of the polysilicon films 23A and 24 is lOOnm.
- the grain size of the Si crystal grains in the polysilicon film 24 is larger than the grain size of the Si crystal grains in the polysilicon film 23.
- the polysilicon film 24 is formed on the p-type doped polysilicon film 23B.
- P ions 33 are formed in the polysilicon film 24 by using a resist pattern (not shown) that exposes the device region 11A as a mask.
- a resist pattern (not shown) that exposes the device region 11A as a mask.
- 4 ⁇ 8 X 10 15 cm- 2 for example 5 X L_ ⁇ 15 cm- 2 de Ions are implanted at a dose, and this is doped n-type.
- Bion is 5 to 10 keV, for example, under an acceleration energy of 8 keV, 3 to 6 X 10 15 cm- 2, and ion-implanted at a dose of e.g. 4 X 10 15 cm- 2, doped with this p-type.
- the polysilicon film 34 is changed to an amorphous state as a result of ion implantation.
- the polysilicon film 23A and the amorphous silicon film 24 of FIG. 10C are patterned to form a laminated gate electrode pattern 34GA having a gate length of, for example, 60 nm.
- a p-type doped stacked gate electrode pattern is formed in the element region 11B.
- the patterning process also patterns the gate insulating film 19, and the gate insulating film 19 is removed except for the lower part of the stacked gate electrode structure.
- the amorphous silicon film 34 doped with n-type and p-type is patterned, respectively. Therefore, it is necessary to optimize the etching conditions so that one of the regions is over-etched and the other region is not under-etched.
- a resist pattern (not shown) exposing the element region 11A is formed on the structure of FIG. 10D, and the resist pattern and the laminated gate electrode pattern 34GA are formed.
- P ions are implanted into the mask under the same conditions as above to form n-type source / drain extension regions 26 on both sides of the stacked gate electrode pattern 34G in the element region 11A.
- p-type source / drain extension regions are formed in the element region 11B by implanting B ions under the same conditions as described above in the same process.
- a sidewall insulating film 27 is formed on the laminated gate electrode pattern 34GA and a similar laminated gate electrode pattern formed on the element region 11B, and the element region 11A is exposed.
- the P ion 35 was previously described using the resist pattern to be formed and the laminated gate electrode pattern 34GA and the sidewall insulating film 27 as a mask.
- n + -type source and drain regions l ie, 1 If are formed outside the sidewall insulating film 27 in the element region 11A.
- B ions are implanted into the element region 11B in the same manner to form p + type source and drain regions corresponding to the p + type source and drain regions 1 lg and 1 lh of the previous embodiment. It is.
- the introduced impurity element is activated by heat-treating the structure of FIG. 10E in a nitrogen atmosphere at 1000 to 1050 ° C. for 0 to 10 seconds. Further, as a result of the heat treatment step of FIG. 10F, the amorphous layer 34A is crystallized and converted into the polysilicon layer 36A. Similar crystallization occurs in the element region 11B.
- a Co film is deposited on the structure of FIG. 10F by sputtering and heat-treated, and then the unreacted Co film is removed by etching and heat-treated, so that the element region 11A has a source as shown in FIG. 11G. And drain regions l ie and 1 If, and CoSi film on polysilicon film 36A
- a structure in which 32 is formed is obtained.
- the structure having a CoSi film has the element region 1
- an interlayer insulating film is formed on the structure of FIG. 10F, although not shown, and a via contact structure and an upper wiring structure are formed as necessary, whereby an n-channel MOS transistor and a p-channel are formed.
- a CMOS device with MOS transistors connected in series is completed.
- the upper wiring structure is formed on the interlayer insulating film in the form of a multilayer wiring structure using the damascene method, the formation of the wiring trench and the formation of the via hole are made following the formation of the interlayer insulating film.
- a Cu wiring layer is formed so as to fill the wiring grooves and via holes. Furthermore, the excess Cu layer on the interlayer insulating film is removed by CMP. If you want to form a complicated wiring structure, you can repeat this process.
- the upper polysilicon film is formed with the impurity element of each conductivity type of the lower polysilicon film force in the stacked gate electrode structure 34GA.
- ions are implanted with low energy, acceleration energy, high energy, and impurity concentration, so that the problem of depletion occurring in the polysilicon gate can be effectively eliminated.
- the thickness of the lower polysilicon film is small. In these parts, the crystal grain size can be suppressed to 50 nm or less, and improvement of TDDB characteristics can be realized at the same time. The same is true for the p-channel MOS transistor formed in the element region 11B.
- a sufficiently large film thickness can be ensured with respect to the entire gate electrode structure, and silicide formation that does not cause a short circuit of the silicide layer on the gate electrode and the source / drain region is achieved.
- the process can be executed.
- the ion implantation process into the upper polysilicon film is performed in a process separate from the ion implantation process for forming the source drain region, so that the short channel effect is suppressed. Therefore, even when shallow ions and junctions are formed in the source / drain regions by reducing the ion implantation energy, a sufficient impurity concentration can be obtained even if the upper part of the stacked polysilicon gate electrode structure, that is, the polysilicon film is thickened. Can be guaranteed. For this reason, the overall height of the stacked gate electrode structure can be set to a height sufficient for silicide formation.
- n-type impurity elements such as As (arsenic) can be used instead of P as the n-type impurity element.
- the lower polysilicon layer 20 and the upper polysilicon layer as described in FIGS. 9G and 9L are used.
- the ion implantation process performed separately at 24A can be performed only for n-channel MOS transistors, and for p-channel MOS transistors, ion implantation into the gate electrode can be performed simultaneously for upper layer 24B and lower layer 23B. It is.
- an element region 11A and an element region 11B are defined on the silicon substrate 11 by an STI element isolation structure 17, and the elements shown in FIGS. 9A to 9E described above are formed.
- an undoped polysilicon film 20 is formed on the gate insulating film 19 by a low pressure CVD method to a thickness of 10 to 50 nm under the same conditions as in the previous embodiment.
- illustration of the thermal oxide film 16 formed between the element isolation insulating film 17 and the silicon substrate 11 is omitted.
- a resist pattern exposing the element region 11 A is formed on the polysilicon film 20 of FIG. 11A, and P is an acceleration energy of 3 to 30 keV using the resist pattern as a mask. Then, ion implantation is performed at a dose of 1 to 3 ⁇ 10 15 cm— 2 , and after the polysilicon film 20 is converted into an amorphous state, an activation heat treatment is further performed, whereby n-type polysilicon is obtained. Membrane 23A is obtained.
- n-type polysilicon film 23A and the corresponding p-type polysilicon film thus formed have a film thickness of 10 to 50 nm, and thus a Si crystal having a crystal grain size of 10 to 50 nm. It is composed of grains.
- the silicon substrate 11 is covered so as to cover the n-type polysilicon film 23A and the corresponding p-type polysilicon film on the element region 11B over the element regions 11A and 11B.
- a dummy insulating film 241 made of, for example, SiN having etching selectivity with respect to the element isolation insulating film 17 formed thereon is formed to a film thickness of, for example, 50 to: OOnm by low pressure CVD.
- the dummy insulating film 241 and the underlying polysilicon film 23A are patterned in the element region 11A to form a dummy gate structure 24GAd corresponding to a desired gate electrode.
- a similar dummy gate structure is formed in the element region 11B.
- I is formed by a high density plasma CVD process and an etch back process.
- a similar dummy sidewall insulating film is also provided in the element region 11B against the dummy gate structure 24GAd. It is formed on a corresponding dummy gate structure.
- the dummy insulating film 241 is also selectively etched from the dummy gate electrode structure 24GAd and the dummy gate electrode structure force formed in the corresponding element region 11B.
- the polysilicon gate film 23A is exposed, the surface of the silicon substrate 11 is exposed outside the dummy sidewall insulating film 271.
- the p-type polysilicon film corresponding to the n-type polysilicon film 23A and the surface of the silicon substrate 11 are exposed.
- Such a selective etching step of the dummy insulating film 241 can be performed by wet etching such as hot phosphoric acid treatment.
- an epitaxial growth of a silicon layer is performed by, for example, 700 to 800 ° C. by a low pressure CVD method.
- a low pressure CVD method typically, using dichlorosilane, hydrogen chloride and hydrogen at a temperature of 750 ° C., the epitaxial regions 11S and 11D are formed on the outside of the dummy sidewall insulating film 271 and the silicon substrate 11 is gate-insulated. It is formed at a height of 50 to 100 nm with respect to the interface with the film 19.
- the polysilicon film 24A force grows up to the upper end of the dummy sidewall insulating film 271 on the n-type polysilicon film 23A.
- the same laminated gate electrode structure 24GA as described above is formed.
- the dummy sidewall insulating film 271 is removed, and the epitaxial regions 11S and 11D are included in the silicon substrate 11 using the stacked gate electrode structure 24GA as a self-aligned mask.
- P ions 25A force are implanted in the same manner as in the step of FIG. 9L, and an n-type source extension region 11a and a drain etching region l ib are formed on both sides of the stacked gate electrode structure 24GA.
- a p-type source extension region and drain extension region are formed in the element region 11B.
- FIG. 11H shows a state in which the upper portion of the polysilicon film 24A is changed into an amorphous state by vigorous ion implantation.
- SiO is formed on both sides of the stacked gate electrode structure 24GA of FIG. 11H.
- a sidewall insulating film 27 composed of two films is formed by high-density plasma CVD so as to expose the epitaxial regions 11S and 11D.
- P ions 28A are formed in the element region 11A. Ion implantation is performed under the same conditions as in the step of FIG. 90 described above, and n-type doped source and drain regions l ie, 1 If are formed in the epitaxial regions 11S and 11D.
- the entire 24A is doped to n + type. Further, as a result of intensive ion implantation, the entire polysilicon film 24A changes to an amorphous state.
- the structure of FIG. 11J is heat-treated at a temperature of 1000 to 1050 ° C. for 0 to 10 seconds to activate the impurity element introduced in the previous ion implantation process, and further to the silicide.
- a temperature of 1000 to 1050 ° C. for 0 to 10 seconds to activate the impurity element introduced in the previous ion implantation process, and further to the silicide.
- FIG. 1 1 K The n-channel MO S transistor and p-channel MO S transistor of the present invention are shown in FIG. 1 1 K.
- the P-ion reaches the bottom of the polysilicon film 24A.
- the lower end of the formed n + -type source region l ie or drain region l lf can be made substantially coincident with the lower end of the source or drain extension regions l la and l ib.
- the lower ends of the source and drain regions l ie and l lf are positioned in the vicinity of the surface of the silicon substrate 11, and the short channel can be effectively suppressed during the operation of the n-channel MOS transistor.
- the same effect of suppressing the short channel effect can be obtained also in the p-channel MOS transistor formed in the element region 11B.
- the source and drain extension regions 11a and 11b can be formed immediately after the formation of the dummy gate structure 24GAd having the ID shown in FIG. 1. However, as shown in the present embodiment, FIG. By performing it after the 11G epitaxial regrowth process, thermal history can be minimized.
- the power of the impurity element introduced by ion implantation is activated by a dedicated heat treatment process.
- This activation process uses other processes including the heat treatment process. It is also possible to do this.
- the lower polysilicon layer can be crystallized using a process of depositing the upper polysilicon layer.
- the gate insulating film is described as being a SiON film.
- the present invention is not limited to such a specific film, but it is also possible to use a SiO film or a SiN film. It is also possible to use so-called high-K films such as TaO.
- the substrate 11 is not limited to a Balta silicon substrate, but a SOS substrate in which a silicon epitaxial layer is formed on a sapphire substrate, or a single crystal silicon layer on an insulating film on a silicon substrate. It is also possible to use the formed SOI substrate.
- the substrate 11 is not limited to a silicon substrate.
- a SiGe mixed crystal substrate a SiC mixed crystal substrate in which a small amount of C is added to Si, or a SiGeC mixed crystal substrate. It is also possible to use.
- each layer constituting the gate electrode is formed as an amorphous silicon layer that does not need to be formed as a polysilicon layer.
- the silicon layer constituting the gate electrode of each MOS transistor is not limited to the polysilicon layer. It is also possible to configure.
- the gate electrode is described as a laminated polysilicon film. At least one of the lower and upper polysilicon films constituting the stacked gate electrode structure is not limited to Si, but Ge or C, Alternatively, Ge and C may be included.
- the gate insulating film 19 is also patterned at the same time, but this is not intentional.
- the thickness of the gate insulating film 19 is 2 nm or more, the gate insulating film 19 can be continuously left on the surface of the silicon substrate 11.
- the ion implantation process for forming the source extension region and the drain extension region is performed through such a residual insulating film.
- this is intended when the gate insulating film 19 has a film thickness of 2 nm or more and the gate insulating film 19 is not spontaneously patterned during the patterning of the laminated gate electrode structure. It is also possible to put a pattern.
- the present invention it is possible to realize a semiconductor device in which depletion of the polysilicon gate electrode without complicating the manufacturing process is suppressed, and at the same time, deterioration of TDDB characteristics is suppressed.
- a semiconductor device since the doping of the polysilicon gate electrode is performed by ion implantation, according to the present invention, for example, a CMOS element having a polysilicon gate having a different conductivity type can be manufactured by a simple process. It becomes possible.
- the source / drain regions are stacked on the semiconductor substrate by regrowth simultaneously with the formation of the upper polysilicon layer in the polysilicon gate electrode having the multilayer structure.
- the short channel effect can be effectively suppressed by forming the source / drain structure and doping the regenerated source / drain region to a desired conductivity type by ion implantation.
Abstract
Description
Claims
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JP2006548906A JPWO2006068027A1 (ja) | 2004-12-20 | 2005-12-15 | 半導体装置およびその製造方法 |
US11/812,516 US20080122007A1 (en) | 2004-12-20 | 2007-06-19 | Semiconductor device and fabrication process thereof |
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US11850583B2 (en) | 2019-06-12 | 2023-12-26 | Siemens Healthcare Diagnostics Inc. | Plasma separation and sample metering device and kits and methods of use related thereto |
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KR20120030710A (ko) * | 2010-09-20 | 2012-03-29 | 삼성전자주식회사 | 게이트 구조물, 그 형성 방법 및 이를 포함하는 반도체 소자의 제조 방법 |
US8895435B2 (en) * | 2011-01-31 | 2014-11-25 | United Microelectronics Corp. | Polysilicon layer and method of forming the same |
EP3024017A4 (en) * | 2013-07-16 | 2017-03-01 | Hitachi, Ltd. | Semiconductor device and method for manufacturing same |
CN104425340A (zh) * | 2013-08-22 | 2015-03-18 | 中国科学院微电子研究所 | 半导体制造方法 |
US10133428B2 (en) * | 2015-05-29 | 2018-11-20 | Samsung Display Co., Ltd. | Flexible display device including a flexible substrate having a bending part and a conductive pattern at least partially disposed on the bending part |
KR102370620B1 (ko) * | 2017-07-10 | 2022-03-04 | 삼성전자주식회사 | 반도체 메모리 장치 및 도전체 구조물 |
US10651039B2 (en) * | 2017-12-29 | 2020-05-12 | Texas Instruments Incorporated | Polysilicon gate formation in CMOS transistors |
CN111092112B (zh) * | 2018-10-23 | 2020-11-13 | 合肥晶合集成电路有限公司 | Mos场效应晶体管及其制造方法 |
US11502185B2 (en) * | 2019-11-26 | 2022-11-15 | Taiwan Semiconductor Manufacturing Co., Ltd. | Methods of manufacturing a gate electrode having metal layers with different average grain sizes |
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JPH05198592A (ja) * | 1991-08-26 | 1993-08-06 | American Teleph & Telegr Co <Att> | ポリシリコン上にケイ化物を形成するための改良された方法 |
JPH0677246A (ja) * | 1990-10-12 | 1994-03-18 | Texas Instr Inc <Ti> | トランジスタ及びその製造方法 |
JPH06296016A (ja) * | 1993-04-08 | 1994-10-21 | Seiko Epson Corp | 半導体装置 |
JPH1070270A (ja) * | 1996-06-12 | 1998-03-10 | Texas Instr Inc <Ti> | サブミクロン・デバイスのための極めて浅い接合領域とその製造法 |
JP2000208640A (ja) * | 1999-01-08 | 2000-07-28 | Sony Corp | 半導体装置の製造方法 |
JP2001332630A (ja) * | 2000-05-19 | 2001-11-30 | Sharp Corp | 半導体装置の製造方法 |
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US5444302A (en) * | 1992-12-25 | 1995-08-22 | Hitachi, Ltd. | Semiconductor device including multi-layer conductive thin film of polycrystalline material |
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- 2005-12-15 WO PCT/JP2005/023055 patent/WO2006068027A1/ja active Application Filing
- 2005-12-15 JP JP2006548906A patent/JPWO2006068027A1/ja not_active Withdrawn
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2007
- 2007-06-19 US US11/812,516 patent/US20080122007A1/en not_active Abandoned
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JPH0677246A (ja) * | 1990-10-12 | 1994-03-18 | Texas Instr Inc <Ti> | トランジスタ及びその製造方法 |
JPH05198592A (ja) * | 1991-08-26 | 1993-08-06 | American Teleph & Telegr Co <Att> | ポリシリコン上にケイ化物を形成するための改良された方法 |
JPH06296016A (ja) * | 1993-04-08 | 1994-10-21 | Seiko Epson Corp | 半導体装置 |
JPH1070270A (ja) * | 1996-06-12 | 1998-03-10 | Texas Instr Inc <Ti> | サブミクロン・デバイスのための極めて浅い接合領域とその製造法 |
JP2000208640A (ja) * | 1999-01-08 | 2000-07-28 | Sony Corp | 半導体装置の製造方法 |
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