WO2019150947A1 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- WO2019150947A1 WO2019150947A1 PCT/JP2019/001056 JP2019001056W WO2019150947A1 WO 2019150947 A1 WO2019150947 A1 WO 2019150947A1 JP 2019001056 W JP2019001056 W JP 2019001056W WO 2019150947 A1 WO2019150947 A1 WO 2019150947A1
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- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/67—Thin-film transistors [TFT]
- H10D30/6757—Thin-film transistors [TFT] characterised by the structure of the channel, e.g. transverse or longitudinal shape or doping profile
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- H10D30/031—Manufacture or treatment of FETs having insulated gates [IGFET] of thin-film transistors [TFT]
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- H10D30/024—Manufacture or treatment of FETs having insulated gates [IGFET] of fin field-effect transistors [FinFET]
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- H10D30/43—FETs having zero-dimensional [0D], one-dimensional [1D] or two-dimensional [2D] charge carrier gas channels having one-dimensional [1D] charge carrier gas channels, e.g. quantum wire FETs or transistors having 1D quantum-confined channels
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- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/62—Fin field-effect transistors [FinFET]
- H10D30/6215—Fin field-effect transistors [FinFET] having multiple independently-addressable gate electrodes
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- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/67—Thin-film transistors [TFT]
- H10D30/6729—Thin-film transistors [TFT] characterised by the electrodes
- H10D30/673—Thin-film transistors [TFT] characterised by the electrodes characterised by the shapes, relative sizes or dispositions of the gate electrodes
- H10D30/6735—Thin-film transistors [TFT] characterised by the electrodes characterised by the shapes, relative sizes or dispositions of the gate electrodes having gates fully surrounding the channels, e.g. gate-all-around
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- H10D30/67—Thin-film transistors [TFT]
- H10D30/674—Thin-film transistors [TFT] characterised by the active materials
- H10D30/6755—Oxide semiconductors, e.g. zinc oxide, copper aluminium oxide or cadmium stannate
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- H10D62/117—Shapes of semiconductor bodies
- H10D62/118—Nanostructure semiconductor bodies
- H10D62/119—Nanowire, nanosheet or nanotube semiconductor bodies
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- H10D84/01—Manufacture or treatment
- H10D84/0123—Integrating together multiple components covered by H10D12/00 or H10D30/00, e.g. integrating multiple IGBTs
- H10D84/0126—Integrating together multiple components covered by H10D12/00 or H10D30/00, e.g. integrating multiple IGBTs the components including insulated gates, e.g. IGFETs
- H10D84/0165—Integrating together multiple components covered by H10D12/00 or H10D30/00, e.g. integrating multiple IGBTs the components including insulated gates, e.g. IGFETs the components including complementary IGFETs, e.g. CMOS devices
- H10D84/0167—Manufacturing their channels
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- H10D84/01—Manufacture or treatment
- H10D84/0123—Integrating together multiple components covered by H10D12/00 or H10D30/00, e.g. integrating multiple IGBTs
- H10D84/0126—Integrating together multiple components covered by H10D12/00 or H10D30/00, e.g. integrating multiple IGBTs the components including insulated gates, e.g. IGFETs
- H10D84/0165—Integrating together multiple components covered by H10D12/00 or H10D30/00, e.g. integrating multiple IGBTs the components including insulated gates, e.g. IGFETs the components including complementary IGFETs, e.g. CMOS devices
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- H10D84/01—Manufacture or treatment
- H10D84/0123—Integrating together multiple components covered by H10D12/00 or H10D30/00, e.g. integrating multiple IGBTs
- H10D84/0126—Integrating together multiple components covered by H10D12/00 or H10D30/00, e.g. integrating multiple IGBTs the components including insulated gates, e.g. IGFETs
- H10D84/0165—Integrating together multiple components covered by H10D12/00 or H10D30/00, e.g. integrating multiple IGBTs the components including insulated gates, e.g. IGFETs the components including complementary IGFETs, e.g. CMOS devices
- H10D84/0186—Manufacturing their interconnections or electrodes, e.g. source or drain electrodes
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Definitions
- the present disclosure relates to a semiconductor device, and specifically to a field effect transistor having a nanowire structure or a nanosheet structure.
- FETs having a Fin structure after the 14 nm generation for convenience, “Fin FET” FETs having an FD-SOI (Fully ⁇ Depleted-Silicon On Insulator) structure (referred to as“ FD-SOI • FET ”for the sake of convenience) are in full use.
- the thickness of the silicon layer which is closely related to the scaling of the gate length, that is, the thickness of the Fin structure in the Fin • FET and the thickness of the silicon layer in the FD-SOI • FET are important in reducing the size of the FET. Although it is an element, it is considered that the limit of the thickness of the silicon layer is 5 nm.
- nanowire • FET As a technique for overcoming the limit of the thickness of the silicon layer constituting the channel forming region of the FET, there can be cited a FET having a nanowire structure (referred to as “nanowire • FET” for convenience) (for example, see JP-A-2015-195405).
- the gate electrode of the one sandwiching a channel forming region by applying a + V dd by applying the other to the gate electrode + V dd sandwiching a channel formation region, the driving capability of the transistor Improvements can be made.
- leakage in the transistor off state can be achieved. The current can be reduced.
- the nanowire FET disclosed in the above patent publication cannot achieve a low leakage current while improving the performance in accordance with the operation of the transistor.
- an object of the present disclosure is to provide a semiconductor device that can achieve a low leakage current while improving performance in accordance with the operation of the transistor.
- a semiconductor device includes an N-layer gate electrode layer and an (N-1) layer on an insulating material layer of a base body on which an insulating material layer is formed on the surface of a conductive substrate.
- a structure in which channel formation region layers (where N ⁇ 3) are alternately arranged The structure has a bottom surface, a top surface facing the bottom surface, a first side surface, a second side surface, a third side surface facing the first side surface, and a fourth side surface facing the second side surface
- the channel formation region layer is The bottom surface constituting the bottom surface of the structure, The top surface constituting the top surface of the structure, A first side surface constituting the first side surface of the structure, The second side, A third side surface constituting the third side surface of the structure, and A fourth side facing the second side;
- the gate electrode layer is The bottom surface constituting the bottom surface of the structure, The top surface constituting the top surface of the structure, A first side surface constituting the first side surface of the structure, The second side, A third side surface constituting the third side surface of the structure, and A fourth side facing the second side;
- the second surface of the first gate electrode layer constitutes the second side surface of the structure
- the fourth surface of the Nth gate electrode layer constitutes the fourth side surface
- (N ⁇ 1)) channel formation region layer is in contact with the fourth surface of the nth gate electrode layer, The fourth surface of the nth channel formation region layer is in contact with the second surface of the (n + 1) th gate electrode layer, One of the odd-numbered gate electrode layer and the even-numbered gate electrode layer is connected to the first contact portion, and the other is connected to the second contact portion.
- FIG. 1 is a conceptual diagram illustrating an arrangement of each component of the semiconductor device according to the first embodiment.
- FIGS. 2A, 2B, and 2C are schematic partial end views of the semiconductor device of Example 1 along arrows AA, BB, and CC in FIG. 1, respectively.
- 3A and 3B are schematic partial end views of the same substrate and the like as taken along the arrow AA in FIG. 1, for explaining the method of manufacturing the semiconductor device of Example 1, and
- FIG. 3B is a schematic partial plan view of the base body corresponding to FIG. 3B.
- 4A and 4B are schematic partial end views of the substrate and the like, similar to those taken along the arrow AA in FIG. 1, for explaining the method of manufacturing the semiconductor device of Example 1, following FIG. 3B.
- FIG. 1 is a conceptual diagram illustrating an arrangement of each component of the semiconductor device according to the first embodiment.
- FIGS. 2A, 2B, and 2C are schematic partial end views of the semiconductor device of Example 1 along arrows AA, BB, and
- FIG. 4C is a schematic partial plan view of the base body corresponding to FIG. 4B.
- FIG. 5A is a schematic partial end view of the substrate and the like similar to that taken along the arrow AA in FIG. 1 for explaining the method for manufacturing the semiconductor device of Example 1, following FIG. 4B.
- FIG. 5B is a schematic partial plan view of the base body corresponding to FIG. 5A.
- FIG. 6 is a schematic partial plan view of a substrate and the like for explaining the method for manufacturing the semiconductor device of Example 1 following FIG. 5B.
- 7A, 7B, and 7C are schematic partial end views of the semiconductor device of the second embodiment similar to that taken along arrows AA, BB, and CC in FIG. 1, respectively. . 8A, FIG. 8B, FIG. 8C, and FIG.
- FIG. 8D are schematic partial end views of the substrate and the like similar to those taken along the arrow AA in FIG. 1, for explaining the method of manufacturing the semiconductor device of the second embodiment. It is. 9A, 9B, and 9C are schematic partial views of the substrate and the like similar to those taken along the arrow AA in FIG. 1, for explaining the method of manufacturing the semiconductor device of Example 2, following FIG. 8D. It is an end view.
- FIG. 10A is a schematic partial plan view of a base body and the like for explaining the manufacturing method of the semiconductor device of Example 2 following FIG. 9C
- FIG. 10B is a modified example of the semiconductor device of Example 2 It is a conceptual diagram which shows arrangement
- 11A, 11B, and 11C are schematic partial end views of the semiconductor device of Example 3 that is similar to that taken along arrows AA, BB, and CC in FIG. 1, respectively.
- . 12A and 12B are schematic partial end views of the semiconductor device of the fourth embodiment similar to that taken along the arrow AA in FIG.
- FIG. 13 is a schematic partial end view of a modification of the semiconductor device of Example 4 similar to that taken along the arrow AA in FIG. 14A, 14B, 14C, and 14D are schematic partial end views of the substrate and the like similar to those taken along the arrow AA in FIG. 1, for explaining the method of manufacturing the semiconductor device according to the fifth embodiment. It is.
- FIG. 15A and 15B are schematic partial end views of the substrate and the like, similar to those taken along the arrow AA in FIG. 1, for explaining the method of manufacturing the semiconductor device of Example 5 following FIG. 14D. is there.
- FIG. 16 is a diagram for explaining that by adding a back bias to the channel formation region, performance can be improved in accordance with the operation of the semiconductor device and low leakage current can be achieved.
- the channel formation region layer can be configured to include a channel structure portion formed of a nanowire structure or a nanosheet structure and an insulating portion.
- the direction from the second side surface of the structure to the fourth side surface of the structure is the first direction (X direction)
- the direction from the first side surface of the structure to the third side surface of the structure is the second direction.
- the channel structure part constituting one channel formation region layer is 1 or a plurality of nanowire structures or nanosheet structures extending in the direction (Y direction), and an outer peripheral portion or a part of these nanowire structures or nanosheet structures is an insulating portion (corresponding to a gate insulating film) Covered.
- one or a plurality of nanowire structures or nanosheet structures are juxtaposed along the third direction (Z direction). Note that the X direction, the Y direction, and the Z direction are in a relationship in which their projected images are orthogonal to each other.
- the first surface of the channel formation region layer is connected to one source / drain region common to the channel formation region layer
- the third surface of the channel formation region layer may be connected to the other source / drain region common to the channel formation region layer.
- the first contact portion is formed above the base, and is connected to a first wiring (specifically, for example, a wiring functioning as a signal line; the same applies to the following).
- the extending part of the gate electrode layer extends in the insulating material layer,
- the second contact portion connected to the extended portion of the gate electrode layer applies a second wiring formed on the conductive substrate (specifically, for example, a back bias such as a reverse back bias or a forward back bias).
- a wiring functioning as a back bias potential power source line or a wiring functioning as a power source line V dd or a power source line V ss (the same applies hereinafter) can be employed.
- the extending portion of the gate electrode layer can penetrate the insulating material layer. Furthermore, in these cases, the second contact along the first direction (X direction) when the direction from the second side surface of the structure toward the fourth side surface of the structure is the first direction (X direction).
- the thickness of the gate electrode layer connected to the portion may be thicker than the thickness of the gate electrode layer connected to the first contact portion along the first direction (X direction).
- semiconductor device of the present disclosure including the various preferred embodiments described above (hereinafter, referred to as “semiconductor device of the present disclosure”), as a base, a silicon semiconductor substrate, an SOI (Si On Insulator) substrate, an SGOI (SiGe On Insulator) substrate.
- the material constituting the channel structure include Si, SiGe, Ge, and InGaAs.
- the semiconductor device or the like of the present disclosure can be an n-channel type or a p-channel type. In the case of the n-channel type, the channel structure portion may be made of Si, and in the case of the p-channel type, the channel structure portion may be made of SiGe.
- the semiconductor device or the like of the present disclosure is an n-channel type or a p-channel type is determined solely by selection of a material constituting the gate electrode layer from the viewpoint of obtaining an optimum work function for each.
- the channel structure portion is made of Si and the semiconductor device is an n-channel type
- TiN, TaN, Al, TiAl, and W can be cited as materials for forming the gate electrode layer.
- TiN and W can be cited as materials constituting the gate electrode layer.
- Examples of the material constituting the insulating portion corresponding to the gate insulating film include SiN, SiON, and SiO 2 , and high dielectric constant materials (so-called High-k materials) such as Hf0 2 , HfAlON, and Y 2 O 3. Can also be mentioned.
- both ends of a wire made of, for example, Si or SiGe having a diameter of, for example, 5 to 10 nm are supported by one and the other source / drain regions.
- the width ⁇ thickness is, for example, (10 nm to 50 nm) ⁇ (5 nm to 10 nm), for example, the ends of the substantially rectangular material made of Si or SiGe, for example. Supported by source / drain regions.
- whether it becomes a nanowire structure or a nanosheet structure is dependent on the thickness of the material which comprises these, and the width
- Examples of the material constituting the source / drain region include silicon (Si), SiGe, and Ge.
- the first contact portion and the second contact portion for example, silicon (Si), aluminum, or an aluminum alloy (for example, pure aluminum, Al—Si, Al—Cu, Al—Si—Cu, Al) -Ge, Al-Si-Ge), polysilicon, copper, copper alloy, tungsten, tungsten alloy, titanium, titanium alloy (including TiW, TiNW, TiN, TiAl), WSi 2 , MoSi 2 , TaN it can.
- the insulating film described later is made of SiO 2 , SiN, or SiON.
- the materials constituting the insulating material layer are SiO 2 , NSG (non-doped silicate glass), BPSG (boron / phosphorus silicate / glass), PSG, BSG, AsSG, SbSG, PbSG, SOG (spin-on-glass), LTO (low temperature oxide, low temperature CVD-SiO 2 ), low melting glass, glass paste, and other SiO x- based materials (materials constituting silicon-based oxide films); SiN and SiON Examples include SiN-based materials including SiON-based materials; SiOC; SiOF; SiCN, or titanium oxide (TiO 2 ), tantalum oxide (Ta 2 O 5 ), aluminum oxide (Al 2 O 3 ), and oxidation.
- magnesium MgO
- CrO x chromium oxide
- ZrO 2 zirconium oxide
- Niobium oxide Nb 2 O 5
- tin oxide SnO 2
- inorganic insulating material such as vanadium oxide (VO x)
- polyimide resin epoxy resin
- various resins such as acrylic resin
- a low dielectric constant insulating material such as SiOCH, organic SOG, or fluorine resin
- Perfluorocarbon polymer benzocyclobutene, cyclic fluororesin, polytetrafluoroethylene, amorphous tetrafluoroethylene, polyaryl ether, fluorinated aryl ether, fluorinated polyimide, amorphous carbon, parylene (polyparaxylylene), fluorinated fullerene)
- Silk The D ow Chemical Co. is a trademark of a coating type low dielectric constant interlayer insulating film
- Flare a trademark of Honeywell Electronic Materials Co., which is a polyallyl ether (PAE) material
- Insulating material layers and interlayer insulating layers can be formed by various CVD methods, various coating methods, various PVD methods including sputtering and vacuum deposition methods, various printing methods such as screen printing methods, plating methods, electrodeposition methods, immersion methods, sol-gels. It can form based on well-known methods, such as a method.
- Example 1 relates to a semiconductor device (field effect transistor, nanowire / FET) of the present disclosure.
- FIG. 1 is a conceptual diagram showing the arrangement of each component of the semiconductor device according to the first embodiment.
- the schematic diagram of the semiconductor device according to the first embodiment along arrows AA, BB, and CC in FIG. Typical partial end views are shown in FIGS. 2A, 2B, and 2C, respectively.
- the semiconductor device of Example 1 is On the insulating material layer 61 of the base body on which the insulating material layer 61 is formed on the surface of the conductive substrate 60, N gate electrode layers G 1 , G 2 , G 3 and (N-1) channel forming region layers A structure in which CH 1 and CH 2 (where N ⁇ 3) are alternately juxtaposed,
- the structure includes a bottom surface 15, a top surface 16 that faces the bottom surface 15, a first side surface 11, a second side surface 12, a third side surface 13 that faces the first side surface 11, and a fourth side surface that faces the second side surface 12.
- the channel formation region layers CH 1 and CH 2 are Bottom surfaces 35 1 , 35 2 constituting the bottom surface 15 of the structure, Top surfaces 36 1 , 36 2 constituting the top surface 16 of the structure, First side surfaces 31 1 , 31 2 constituting the first side surface 11 of the structure, Second side surfaces 32 1 , 32 2 , Third side surfaces 33 1 , 33 2 constituting the third side surface 13 of the structure, and Fourth side 34 1, 34 2 and the second side surface 32 1, 32 2 and the counter, Have
- the gate electrode layers G 1 , G 2 , G 3 are Bottom surfaces 25 1 , 25 2 , 25 3 constituting the bottom surface 15 of the structure, Top surfaces 26 1 , 26 2 , 26 3 constituting the top surface 16 of the structure, First side surfaces 21 1 , 21 2 , 21 3 constituting the first side surface 11 of the structure, Second side surfaces 22 1 , 22 2 , 22 3 , Third side surfaces 23 1 , 23 2 , 23 3 constituting the third side surface 13 of the structure, and The second side surface 22 1, 22 2, 22 3
- channel formation region layers CH 1 and CH 2 are n-th gate electrode layers G 1.
- G 2 in contact with the fourth surfaces 24 1 , 24 2
- the fourth surfaces 34 1 and 34 2 of the nth channel formation region layers CH 1 and CH 2 are in contact with the second surfaces 22 2 and 22 3 of the (n + 1) th gate electrode layers G 2 and G 3 .
- One of the odd-numbered gate electrode layers G 1 and G 3 and the even-numbered gate electrode layer G 2 (specifically, in the first embodiment, the odd-numbered gate electrode layers G 1 and G 3 )
- the first contact portions 43 1 and 43 3 are connected to each other, and the other (specifically, even-numbered gate electrode layer G 2 in the first embodiment) is connected to the second contact portion 44 2 .
- the channel forming region layers CH 1 and CH 2 are composed of a channel structure portion 37 having a nanowire structure or a nanosheet structure (nanosheet structure in the illustrated example) and an insulating portion 38.
- the channel structure portion 37 constituting one channel forming region layer is composed of one nanosheet structure
- the portion of the nanosheet structure facing the gate electrode layer is an insulating portion. 38 (corresponding to a gate insulating film).
- the first surface 31 1, 31 2 of the channel forming region layer CH 1, CH 2 is connected to the source / drain region 41 of the one common to the channel formation region layer CH 1, CH 2, channel forming region third surface 33 1, 33 2 layers CH 1, CH 2 is connected to the other source / drain region 42 in common with the channel formation region layer CH 1, CH 2.
- first contact portion 43 1, 43 3 (specifically, for example, wirings serving as a signal line) a first wiring (not shown) is connected to the second contact portion 44 2, illustrated Connected to the second wiring (specifically, for example, a wiring functioning as a back bias potential power supply line).
- the first side surfaces 21 1 , 21 2 , 21 3 of the gate electrode layers G 1 , G 2 , G 3 are covered with an insulating film 51, and the fourth side surfaces of the gate electrode layers G 1 , G 2 , G 3 are covered.
- the side surfaces 24 1 , 24 2 , 24 3 are covered with an insulating film 52.
- the substrate is made of an SOI substrate. That is, the insulating material layer 61 inside the conductive substrate 60 made of a silicon semiconductor substrate is formed on the base.
- the base has a laminated structure of a conductive substrate 60 made of a silicon semiconductor substrate, an insulating material layer 61, and a silicon layer 62.
- the channel structure 37 is composed of a silicon layer 62.
- the semiconductor device of Example 1 is an n-channel type. TiN, TaN, Al, TiAl, and W (specifically, for example, TiN) can be cited as materials constituting the gate electrode layers G 1 , G 2 , and G 3 .
- the gate insulating film constituting a part of the insulating part 38 is made of SiON, and the gate insulating film constituting the remaining part of the insulating part 38 is made of a high dielectric constant material, specifically, HfO 2 .
- the source / drain regions 41 and 42 are made of silicon.
- the first contact portions 43 1 and 43 3 and the second contact portion 44 2 are made of, for example, silicon (Si), aluminum, or an aluminum alloy (for example, pure aluminum, Al—Si, Al—Cu, Al—Si—Cu, Al-Ge, Al-Si- Ge), comprising polysilicon, copper, copper alloy, tungsten, tungsten alloy, titanium, titanium alloy (TiW, TiNW, TiN, the TiAl), consists WSi 2, MoSi 2, TaN,
- the insulating films 51 and 52 have the same configuration as that of the insulating portion 38.
- FIG. 3A, FIG. 3B, FIG. 4A which are schematic partial end views of the substrate, etc., taken along arrow AA in FIG.
- FIGS. 4B and 5A and FIGS. 3C, 4C, 5B, and 6 which are schematic partial plan views of the substrate and the like, a method for manufacturing the semiconductor device of Example 1 will be described.
- a protective layer 63 made of SiN is formed on the top surface of the silicon layer 62 in the SOI substrate based on the CVD method. In this way, the structure shown in FIG. 3A can be obtained.
- Step-110 the portion of the silicon layer 62 where the gate electrode layers G 1 , G 2 , G 3 are to be formed is removed. Specifically, on the protective layer 63, an etching resist layer (not shown) having openings in regions where the gate electrode layers G 1 , G 2 , G 3 are to be formed is provided. Then, using this etching resist layer, the protective layer 63 and the silicon layer 62 are etched in a trench shape, and then the etching resist layer is removed. In this way, the structure shown in FIGS. 3B and 3C can be obtained. The regions of the removed silicon layer 62 where the gate electrode layers G 1 , G 2 , G 3 are to be formed are indicated by openings 64 1 , 64 2 , 64 3 .
- a channel structure portion 37 and an insulating portion 38 are formed in the silicon layer 62.
- a part of the insulating portion 38 (gate insulating film) made of SiON is formed by thermally oxidizing the exposed side wall of the silicon layer 62.
- the remaining part (not shown) of the insulating part 38 (gate insulating film) made of the HfO 2 layer is formed on a part of the insulating part 38 (gate insulating film) made of SiON on the basis of the ALD (Atomic Layer Deposition) method.
- the remaining portion (HfO 2 layer) of the insulating portion 38 (gate insulating film) deposited on the bottoms of the openings 64 1 , 64 2 , 64 3 is removed by light etching. In this way, the structure shown in FIG. 4A can be obtained.
- the insulating films 51 and 52 can be formed together as described above.
- Step-130 After forming a gate electrode constituting layer 27 made of TiN on the entire surface based on the CVD method, the gate electrode constituting layer 27 above the channel forming region layers CH 1 and CH 2 is removed by performing a planarization process, The openings 64 1 , 64 2 , 64 3 are filled with a gate electrode constituting layer 27 made of TiN. Thus, the gate electrode layers G 1 , G 2 , G 3 can be obtained (see FIGS. 4B and 4C).
- Step-140 Thereafter, unnecessary silicon layer 62 is removed based on photolithography technique and etching technique, and then protective layer 63 on channel formation region layers CH 1 and CH 2 is removed based on photolithography technique and etching method. Thus, the source / drain regions 41 and 42 made of the silicon layer 62 can be obtained. Thus, the structure shown in FIGS. 5A, 5B, 1, 2A, 2B, and 2C can be obtained.
- an interlayer insulating layer (not shown) is formed on the entire surface, and openings are formed in the interlayer insulating layers above the source / drain regions 41 and 42 and the gate electrode layers G 1 , G 2 and G 3.
- the first contact portions 43 1 and 43 3 and the second contact portion 44 2 can be obtained by forming a conductive layer on the interlayer insulating layer including the conductive layer and patterning the conductive layer based on the photolithography technique and the etching technique.
- the connection holes 46 1 and 46 2 connected to the source / drain regions 41 and 42 can be obtained (see FIG. 6), and the first wiring and the second wiring (not shown) can be obtained.
- first contact portions 43 1 , 43 3 formed above the base and connected to the first wiring, and the second contact formed above the base and connected to the second wiring. it is possible to obtain the contact portion 44 2.
- the first wiring and the second wiring are formed on the interlayer insulating layer.
- the semiconductor device of Example 1 has a structure in which channel formation region layers and gate electrode layers are alternately arranged, and one of the odd-numbered gate electrode layer and the even-numbered gate electrode layer is a first contact. Since the other is connected to the second contact portion, specifically, the odd-numbered gate electrode layer is connected to the first contact portion, and the even-numbered gate electrode layer is connected to the second contact portion. As a result of being connected to the two contact portions, it is possible to apply different voltages to the odd-numbered gate electrode layers and even-numbered gate electrode layers, that is, to apply a back bias different from the gate potential. A low leakage current can be achieved while improving the performance in accordance with the operation. Specifically, it is expected that the standby current can be reduced by 50% and the maximum frequency is improved by 30%.
- FIG. 16 schematically shows the relationship between the potential V gs applied to the gate electrode layer and the current I ds flowing through the channel formation region layer.
- V gs applied to the gate electrode layer
- I ds flowing through the channel formation region layer.
- first contact portion 43 1, 43 3 the first wiring is connected to
- 2 second contact portion 44 second wiring specifically Specifically, for example, it is assumed that the first wiring is connected to 0 volt to V dd volt and the second wiring is fixed to V dd volt (or, for example, Since the V gs -I ds curve when 2 V dd is fixed is as shown in “A”, the performance can be improved in accordance with the operation of the semiconductor device.
- V gs -I ds curve when 0 V to V dd volt is applied to the first wiring and ⁇ V dd fixed (or, for example, ⁇ 2 V dd fixed) is applied to the second wiring is indicated by “B”. It becomes as follows. Note that the relationship between the potential V gs and the current I ds in a semiconductor device having a structure in which a conventional back bias cannot be applied is schematically indicated by “C”.
- the wiring length of the signal line of the logic circuit is short, and when the gate electrode layers connected to the signal line are formed above and below the channel formation region layer, the transfer destination of the heat generated in the channel formation region layer is limited. Therefore, the heat dissipation effect cannot be expected.
- one of the gate electrode layers formed on both sides of the channel formation region layer is used as a wiring for applying a back bias (second wiring) having a very long wiring length. It is connected. As a result, it is possible to effectively dissipate the heat generated in the channel formation region layer. As a result, the self-heating effect is weakened, and performance degradation can be suppressed to a minimum.
- Example 2 is a modification of Example 1.
- 7A, FIG. 7B, and FIG. 7C are schematic partial end views of the semiconductor device of the second embodiment similar to that taken along arrows AA, BB, and CC in FIG.
- the first contact portions 43 1 and 43 3 are formed above the base and are connected to a first wiring (specifically, a wiring functioning as a signal line).
- a first wiring specifically, a wiring functioning as a signal line.
- the extending portion 27 of the gate electrode layer G 2 ' extends through the insulating material layer 61, extending portions 27 of the gate electrode layer G 2' the second contact portion 45 2 connected to the conductive substrate 60 is connected to a second wiring (specifically, for example, a wiring functioning as a back bias potential power supply line, not shown). More specifically, the extending portion 27 ′ of the gate electrode layer G 2 penetrates the insulating material layer 61.
- the configuration and structure of the semiconductor device of the second embodiment can be the same as the configuration and structure of the semiconductor device of the first embodiment, and thus detailed description thereof is omitted.
- FIG. 8A, FIG. 8B, FIG. 8C which are schematic partial end views of the substrate and the like, taken along arrow AA in FIG. 1, for explaining the method of manufacturing the semiconductor device of Example 2.
- FIG. 8D FIG. 9A, FIG. 9B and FIG. 9C, and FIG. 10A and FIG. 10B which are typical partial plan views of the substrate and the like, a method for manufacturing the semiconductor device of Example 2 will be described.
- a protective layer 63 made of SiN is formed on the top surface of the silicon layer 62 in the SOI substrate based on the CVD method. In this way, the structure shown in FIG. 8A can be obtained.
- the channel structure portion 37 and the insulating portion 38 are formed on the silicon layer 62 in the same manner as in [Step-120] of the first embodiment. Form. In this way, the structure shown in FIG. 8D can be obtained.
- the insulating films 51 and 52 can be formed together as described above.
- a gate electrode constituting layer 27 made of TiN is formed on the entire surface based on the CVD method, and then planarized to perform channel formation region layer CH 1 , The gate electrode constituting layer 27 above CH 2 is removed, and the openings 64 1 , 64 2 , 64 3 are filled with the gate electrode constituting layer 27 made of TiN.
- gate electrode layers G 1 , G 2 , G 3 can be obtained (see FIG. 9A).
- an interlayer insulating layer (not shown) is formed on the entire surface, an opening is formed in the interlayer insulating layer above the source / drain regions 41 and 42 and the gate electrode layers G 1 and G 3 , and an interlayer insulating including the opening is then formed.
- the first contact portions 43 1 and 43 3 can be obtained by forming a conductive layer on the layer and patterning the conductive layer based on the photolithography technique and the etching technique, and connected to the source / drain regions 41 and 42.
- the connection holes 46 1 and 46 2 thus formed can be obtained (see FIG. 10A), and a first wiring (not shown) can be obtained.
- the first contact portions 43 1 and 43 3 formed above the base and connected to the first wiring can be obtained.
- the first wiring is formed on the interlayer insulating layer.
- Step-260 After that, for example, after the conductive substrate 60 is thinned from the back surface based on the CMP method, the second contact portion connected to the extending portion 27 ′ of the gate electrode layer G 2 penetrating the insulating material layer 61 by a known method. 45 2 is formed inside the conductive substrate 60 and, at the same time, a second wiring (not shown) connected to the second contact portion 45 2 is formed on the back surface of the conductive substrate 60.
- a second wiring (not shown) connected to the second contact portion 45 2 is formed on the back surface of the conductive substrate 60.
- the second wiring connected to the conductive substrate 60 (specifically, for example, a wiring functioning as a back bias potential power supply line, although not shown). As a result, the second wiring is shared by the plurality of semiconductor devices.
- FIG. 10B a schematic partial plan view of a modified example of the semiconductor device of Example 2, following [Step-240], based on the CVD method, the photolithography technique, and the etching technique, the gate electrode layer G of the second surface 22 1 and the gate electrode layer G fourth surface 24 3 of the projection 28 in a part of the 3 may be provided 1.
- Providing such a protruding portion 28 facilitates the formation (positioning) of the first contact portions 43 1 and 43 3 .
- such a protrusion when forming the openings 64 1, 64 3, by forming a region to be provided a protrusion 28 in the opening 64 1, 64 3, can also be obtained.
- Such a protrusion 28 can also be applied to other embodiments.
- Example 3 is a modification of Example 2.
- FIG. 11A, FIG. 11B, and FIG. 11C show schematic partial end views of the semiconductor device of Example 3 that is the same as taken along arrows AA, BB, and CC in FIG.
- the extending portion 27 ′ of the gate electrode layer G 2 extends in the insulating material layer 61, but does not penetrate the insulating material layer 61.
- the second contact portion 45 2 extends inside the conductive substrate 60 and further inside the insulating material layer 61. In the insulating material layer 61, the extending portion 27 ′ of the gate electrode layer G 2 and the second contact portion 45 2 are connected.
- the extended portions 27 ′′ of the gate electrode layers G 1 and G 3 also extend in the insulating material layer 61.
- the extended portions 27 ′′ of the gate electrode layers G 1 and G 3 are formed of the insulating material. It does not penetrate the layer 61.
- the insulating material layer 61 is further partially formed in the thickness direction (Z direction). , by etching, furthermore, embodiments in a step similar to [step-260] of 2, the extending portion 27 'and the conductive substrate 60 of the gate electrode layer G 2 extending in the insulating material layer 61 This is obtained by removing the portion of the insulating material layer 61 existing between and the second contact portion 45 2 in the removed portion.
- the configuration and structure of the semiconductor device of the third embodiment can be the same as the configuration and structure of the semiconductor device described in the second embodiment.
- Example 4 is a modification of Example 2 and Example 3.
- FIG. 12B shows a schematic partial end view of the semiconductor device of Example 4 similar to that taken along the arrow AA in FIG.
- the first direction (X direction) when the direction from the second side surface 12 of the structure toward the fourth side surface 14 of the structure was defined as the first direction (X direction), the first direction (X direction) was met.
- the thickness t 2 of the gate electrode layer G 2 connected to the second contact portion 45 2 is equal to the gate electrode layer G connected to the first contact portions 43 1 and 43 3 along the first direction (X direction). It is thicker than the thickness t 1 of 1 and G 3 .
- t 2 / t 1 2.0 It was.
- the region of the silicon layer 62 and the region of the insulating material layer 61 where the gate electrode layer G 2 is to be formed are removed.
- the regions of the silicon layer 62 and the insulating material layer 61 where the gate electrode layers G 1 and G 3 are to be formed are removed (see FIG. 12A).
- the extending portion 27 ′ of the gate electrode layer G 2 penetrates the insulating material layer 61, while the extending portion 27 ′′ of the gate electrode layers G 1 and G 3 extends in the insulating material layer 61.
- the state which does not penetrate the insulating material layer 61 can be obtained (see FIG. 12B).
- the configuration and structure of the semiconductor device of the fourth embodiment can be the same as the configuration and structure of the semiconductor device described in the second and third embodiments, and thus detailed description thereof is omitted.
- FIG. 13 shows a schematic partial end view similar to that taken along the line AA in FIG. 1 of a modification of the semiconductor device of the fourth embodiment.
- N gate electrode layers G 1 , G 2 , G 3 , G 4 , N 4 are formed on the insulating material layer 61 of the base having the insulating material layer 61 formed on the surface of the conductive substrate 60.
- the thickness t 2 of the gate electrode layers G 2 and G 4 connected to the second contact part 45 2 is connected to the first contact parts 43 1 , 43 3 and 43 5 (these are not shown). It is thicker than the thickness t 1 of the gate electrode layers G 1 , G 3 , G 5 .
- the second contact portion 45 2 is shared by the gate electrode layers G 2 and G 4 .
- Example 5 is a modification of Examples 1 to 4, and the channel structure portion 37 ′ has a nanowire structure.
- the channel structure portion 37 ′ having such a nanowire structure can be obtained by the following method, for example.
- the channel structure part which comprises one channel formation area layer is comprised from the several nanowire structure extended in a 2nd direction (Y direction), and the outer peripheral part of these nanowire structures is an insulation part ( Covered with a gate insulating film).
- a plurality of nanowire structures are juxtaposed along the third direction (Z direction).
- the drawings in the following description are schematic partial end views similar to those taken along the arrow AA in FIG.
- a first sacrificial layer 65A made of SiGe is formed on the silicon layer (first silicon layer 62A) of the SOI substrate based on an epitaxial growth method, and a second silicon layer is formed on the first sacrificial layer 65A based on the epitaxial growth method.
- 62B is formed, a second sacrificial layer 65B made of SiGe is formed on the second silicon layer 62B based on the epitaxial growth method, and a third silicon layer 62C is formed on the second sacrificial layer 65B based on the epitaxial growth method.
- the portion of the stacked structure in which the gate electrode layer is to be formed is removed in a trench shape by a photolithography technique and an etching technique (see FIG. 14B). Then, after forming a mask layer 71 on a desired region (see FIG. 14C), an etchant having an etching selectivity with respect to the first silicon layer 62A, the second silicon layer 62B, and the third silicon layer 62C is used. The first sacrificial layer 65A and the second sacrificial layer 65B made of SiGe are removed (see FIG. 14D). Both ends of the channel structure portion 37 ′ composed of a nanowire structure are supported by a layered structure portion (not shown) to be the source / drain regions 41 and 42.
- a part of the insulating portion 38 corresponding to the gate insulating film made of SiON is formed by performing thermal oxidation on the channel structure portion 37 ′ (see FIG. 15A).
- the thermal oxidation treatment By performing the thermal oxidation treatment, the cross-sectional shape of the channel structure portion made of the nanowire structure becomes circular.
- the remaining portion of the insulating portion 38 made of HfO 2 is formed on a part of the insulating portion 38 based on the ALD method (see FIG. 15B).
- the configuration and structure of the semiconductor device described in the embodiments, the material constituting the semiconductor device, and the method for manufacturing the semiconductor device are examples, and can be changed as appropriate. . Further, the order of steps in the method for manufacturing a semiconductor device in the embodiment can be changed as appropriate as desired.
- the semiconductor device is an n-channel type, but may be a p-channel type. In this case, the material constituting the semiconductor device may be changed as appropriate.
- a structure in which two channel forming region layers and three gate electrode layers, or four channel forming region layers and five gate electrode layers are alternately arranged in parallel has been described.
- the second wiring may be provided for each semiconductor device, or may be provided for each of a plurality of semiconductor devices. That is, the second wiring may be shared by a plurality of semiconductor devices. With such a structure, the heat dissipation area can be further increased, and the heat dissipation by the second wiring can be further increased. As a result, the self-heating effect can be further suppressed.
- the odd-numbered gate electrode layer (first gate electrode layer) is connected to the first contact portion and the first wiring
- the even-numbered gate electrode layer (second gate electrode layer) is the second contact portion.
- the odd-numbered gate electrode layer (first gate electrode layer) is connected to the second contact portion and the second wiring
- the even-numbered gate electrode layer is connected to the second wiring.
- the gate electrode layer (second gate electrode layer) may be connected to the first contact portion and the first wiring.
- the SiGe layer can also be obtained by forming an upper SiGe layer on the lower Si layer and carrying out an oxidation process, whereby the upper SiGe layer is made into SiO 2 and the lower Si layer is made into a SiGe layer. .
- this indication can also take the following structures.
- N gate electrode layers and (N-1) channel forming region layers (where N ⁇ 3) are alternately juxtaposed on an insulating material layer of a base having an insulating material layer formed on the surface of a conductive substrate.
- a structure comprising The structure has a bottom surface, a top surface facing the bottom surface, a first side surface, a second side surface, a third side surface facing the first side surface, and a fourth side surface facing the second side surface
- the channel formation region layer is The bottom surface constituting the bottom surface of the structure, The top surface constituting the top surface of the structure, A first side surface constituting the first side surface of the structure, The second side, A third side surface constituting the third side surface of the structure, and A fourth side facing the second side;
- the gate electrode layer is The bottom surface constituting the bottom surface of the structure, The top surface constituting the top surface of the structure, A first side surface constituting the first side surface of the structure, The second side, A third side surface constituting the third side surface of the structure, and A fourth side facing the second side;
- the second surface of the first gate electrode layer constitutes the second side surface of the structure
- the fourth surface of the Nth gate electrode layer constitutes the fourth side surface of the structure, The second surface of the nth (where n
- channel formation region layer is in contact with the fourth surface of the nth gate electrode layer, The fourth surface of the nth channel formation region layer is in contact with the second surface of the (n + 1) th gate electrode layer, One of the odd-numbered gate electrode layer and the even-numbered gate electrode layer is connected to the first contact portion, and the other is connected to the second contact portion.
- the channel formation region layer includes a channel structure portion having a nanowire structure or a nanosheet structure and an insulating portion.
- the first surface of the channel formation region layer is connected to one source / drain region common to the channel formation region layer
- the third surface of the channel formation region layer is the semiconductor device according to [A01] or [A02] connected to the other source / drain region common to the channel formation region layer.
- the first contact portion is formed above the base and connected to the first wiring.
- the extending part of the gate electrode layer extends in the insulating material layer,
- [A05] The semiconductor device according to [A04], in which the extending portion of the gate electrode layer penetrates the insulating material layer.
- the thickness of the gate electrode layer connected to the second contact portion along the first direction is The semiconductor device according to [A04] or [A05], which is thicker than a thickness of the gate electrode layer connected to the first contact portion along the first direction.
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Abstract
Description
構造体は、底面、底面と対向する頂面、第1側面、第2側面、第1側面と対向した第3側面、及び、第2側面と対向した第4側面を有し、
チャネル形成領域層は、
構造体の底面を構成する底面、
構造体の頂面を構成する頂面、
構造体の第1側面を構成する第1側面、
第2側面、
構造体の第3側面を構成する第3側面、及び、
第2側面と対向した第4側面、
を有し、
ゲート電極層は、
構造体の底面を構成する底面、
構造体の頂面を構成する頂面、
構造体の第1側面を構成する第1側面、
第2側面、
構造体の第3側面を構成する第3側面、及び、
第2側面と対向した第4側面、
を有し、
第1番目のゲート電極層の第2面は、構造体の第2側面を構成し、
第N番目のゲート電極層の第4面は、構造体の第4側面を構成し、
第n番目(但し、n=1,2・・・(N-1))のチャネル形成領域層の第2面は、第n番目のゲート電極層の第4面と接しており、
第n番目のチャネル形成領域層の第4面は、第(n+1)番目のゲート電極層の第2面と接しており、
奇数番目のゲート電極層及び偶数番目のゲート電極層のいずれか一方は、第1コンタクト部に接続されており、他方は、第2コンタクト部に接続されている。
1.本開示の半導体装置、全般に関する説明
2.実施例1(本開示の半導体装置)
3.実施例2(実施例1の変形)
4.実施例3(実施例2の変形)
5.実施例4(実施例2及び実施例3の変形)
6.実施例5(実施例1~実施例4の変形)
7.その他
本開示の半導体装置において、チャネル形成領域層は、ナノワイヤー構造又はナノシート構造から成るチャネル構造部、及び、絶縁部から構成されている形態とすることができる。具体的には、構造体の第2側面から構造体の第4側面に向かう方向を第1の方向(X方向)、構造体の第1側面から構造体の第3側面に向かう方向を第2の方向(Y方向)、構造体の頂面から構造体の底面に向かう方向を第3の方向(Z方向)としたとき、1層のチャネル形成領域層を構成するチャネル構造部は、第2の方向(Y方向)に延びる1又は複数のナノワイヤー構造又はナノシート構造から構成されており、これらのナノワイヤー構造又はナノシート構造の外周部あるいは一部分は、絶縁部(ゲート絶縁膜に相当する)で覆われている。そして、1層のチャネル形成領域層において、第3の方向(Z方向)に沿って、1又は複数のナノワイヤー構造又はナノシート構造が並置されている。尚、X方向、Y方向及びZ方向は、相互に、それらの射影像が直交する関係にある。
チャネル形成領域層の第1面は、チャネル形成領域層に共通した一方のソース/ドレイン領域に接続されており、
チャネル形成領域層の第3面は、チャネル形成領域層に共通した他方のソース/ドレイン領域に接続されている形態とすることができる。
第1コンタクト部は、基体の上方に形成されており、第1の配線(具体的には、例えば、信号線として機能する配線。以下においても同様)に接続されており、
ゲート電極層の延在部は絶縁材料層内を延びており、
ゲート電極層の延在部に接続された第2コンタクト部は、導電性基板に形成された第2の配線(具体的には、例えば、リバース・バックバイアスあるいはフォワード・バックバイアスといったバックバイアスを印加するバックバイアス電位電源線として機能する配線、あるいは又、電源線Vddや電源線Vssとして機能する配線。以下においても同様)に接続されている構成とすることができる。そして、この場合、ゲート電極層の延在部は絶縁材料層を貫通している構成とすることができる。更には、これらの場合、構造体の第2側面から構造体の第4側面に向かう方向を第1の方向(X方向)としたとき、第1の方向(X方向)に沿った第2コンタクト部に接続されたゲート電極層の厚さは、第1の方向(X方向)に沿った第1コンタクト部に接続されたゲート電極層の厚さよりも厚い構成とすることができる。
導電性基板60の表面に絶縁材料層61が形成された基体の絶縁材料層61上に、N層のゲート電極層G1,G2,G3と(N-1)層のチャネル形成領域層CH1,CH2(但し、N≧3)が交互に並置されて成る構造体を有し、
構造体は、底面15、底面15と対向する頂面16、第1側面11、第2側面12、第1側面11と対向した第3側面13、及び、第2側面12と対向した第4側面14を有する。尚、構造体の頂面16には、製造上、発生する凹凸が含まれるし、構造体の第1側面11、第2側面12、第3側面13及び第4側面14にも、製造上、発生する凹凸が含まれる。即ち、底面や頂面、側面は凹凸面である場合もある。また、実施例1において、N=3である。
構造体の底面15を構成する底面351,352、
構造体の頂面16を構成する頂面361,362、
構造体の第1側面11を構成する第1側面311,312、
第2側面321,322、
構造体の第3側面13を構成する第3側面331,332、及び、
第2側面321,322と対向した第4側面341,342、
を有し、
ゲート電極層G1,G2,G3は、
構造体の底面15を構成する底面251,252,253、
構造体の頂面16を構成する頂面261,262,263、
構造体の第1側面11を構成する第1側面211,212,213、
第2側面221,222,223、
構造体の第3側面13を構成する第3側面231,232,233、及び、
第2側面221,222,223と対向した第4側面241,242,243、
を有し、
第1番目のゲート電極層G1の第2面221は、構造体の第2側面12を構成し、
第N番目のゲート電極層G3の第4面243は、構造体の第4側面14を構成し、
第n番目(但し、n=1,2・・・(N-1))のチャネル形成領域層CH1,CH2の第2面321,322は、第n番目のゲート電極層G1,G2の第4面241,242と接しており、
第n番目のチャネル形成領域層CH1,CH2の第4面341,342は、第(n+1)番目のゲート電極層G2,G3の第2面222,223と接しており、
奇数番目のゲート電極層G1,G3及び偶数番目のゲート電極層G2のいずれか一方(実施例1において、具体的には、奇数番目のゲート電極層G1,G3)は、第1コンタクト部431,433に接続されており、他方(実施例1において、具体的には、偶数番目のゲート電極層G2)は、第2コンタクト部442に接続されている。
先ず、SOI基板におけるシリコン層62の頂面にSiNから成る保護層63をCVD法に基づき形成する。こうして、図3Aに示す構造を得ることができる。
次に、ゲート電極層G1,G2,G3を形成すべきシリコン層62の部分を除去する。具体的には、保護層63の上に、ゲート電極層G1,G2,G3を形成すべき領域に開口部が設けられたエッチング用レジスト層(図示せず)を設ける。そして、このエッチング用レジスト層を用いて、保護層63及びシリコン層62をトレンチ状にエッチングした後、エッチング用レジスト層を除去する。こうして、図3B及び図3Cに示す構造を得ることができる。ゲート電極層G1,G2,G3を形成すべき、除去されたシリコン層62の領域を、開口部641,642,643で示す。
その後、チャネル形成領域層CH1,CH2を得るために、シリコン層62にチャネル構造部37及び絶縁部38(ゲート絶縁膜に相当する)を形成する。具体的には、露出したシリコン層62の側壁を熱酸化処理することで、SiONから成る絶縁部38(ゲート絶縁膜)の一部を形成する。次いで、SiONから成る絶縁部38(ゲート絶縁膜)の一部の上に、ALD(Atomic Layer Deposition)法に基づき、HfO2層から成る絶縁部38(ゲート絶縁膜)の残部(図示せず)を形成する。その後、開口部641,642,643の底部に堆積した絶縁部38(ゲート絶縁膜)の残部(HfO2層)を、ライトエッチングすることで除去する。こうして、図4Aに示す構造を得ることができる。また、以上によって、絶縁膜51,52を併せて形成することができる。
次に、全面にCVD法に基づきTiNから成るゲート電極構成層27を形成した後、平坦化処理を行うことでチャネル形成領域層CH1,CH2の上方のゲート電極構成層27を除去し、開口部641,642,643内をTiNから成るゲート電極構成層27で埋め込む。こうして、ゲート電極層G1,G2,G3を得ることができる(図4B及び図4C参照)。
その後、フォトリソグラフィ技術及びエッチング技術に基づき、不要なシリコン層62を除去し、次いで、フォトリソグラフィ技術及びエッチング法に基づき、チャネル形成領域層CH1,CH2の上の保護層63を除去することで、シリコン層62から成るソース/ドレイン領域41,42を得ることができる。こうして、図5A、図5B、図1、図2A、図2B及び図2Cに示す構造を得ることができる。
次いで、全面に層間絶縁層(図示せず)を形成し、ソース/ドレイン領域41,42及びゲート電極層G1,G2,G3の上方の層間絶縁層に開口を形成した後、開口を含む層間絶縁層上に導電層を形成し、フォトリソグラフィ技術及びエッチング技術に基づき導電層をパターニングすることで、第1コンタクト部431,433、第2コンタクト部442を得ることができるし、ソース/ドレイン領域41,42に接続された接続孔461,462を得ることができるし(図6参照)、図示しない第1の配線及び第2の配線を得ることができる。こうして、基体の上方に形成されており、第1の配線に接続された第1コンタクト部431,433、及び、基体の上方に形成されており、第2の配線に接続された第2コンタクト部442を得ることができる。尚、第1の配線及び第2の配線は、層間絶縁層上に形成されている。
先ず、実施例1の[工程-100]と同様にして、SOI基板におけるシリコン層62の頂面にSiNから成る保護層63をCVD法に基づき形成する。こうして、図8Aに示す構造を得ることができる。
次に、実施例1の[工程-110]と同様にして、ゲート電極層G1,G2,G3を形成すべきシリコン層62の部分をトレンチ状に除去する。こうして、図8Bに示す構造を得ることができる。次いで、ゲート電極層G2を形成すべき領域の底部に位置する絶縁材料層61を除去する。具体的には、保護層63の上に、ゲート電極層G2を形成すべき領域に開口部が設けられたエッチング用レジスト層(図示せず)を設ける。そして、このエッチング用レジスト層を用いて、開口部642の底部に位置する絶縁材料層61をエッチングした後、エッチング用レジスト層を除去する。こうして、図8Cに示す構造を得ることができる。ゲート電極層G2の延在部27’を形成すべき開口部642の部分は、絶縁材料層61内を延びており、絶縁材料層61を貫通している。
その後、チャネル形成領域層CH1,CH2を得るために、実施例1の[工程-120]と同様にして、シリコン層62にチャネル構造部37及び絶縁部38(ゲート絶縁膜に相当する)を形成する。こうして、図8Dに示す構造を得ることができる。また、以上によって、絶縁膜51,52を併せて形成することができる。
次に、実施例1の[工程-130]と同様にして、全面にCVD法に基づきTiNから成るゲート電極構成層27を形成した後、平坦化処理を行うことでチャネル形成領域層CH1,CH2の上方のゲート電極構成層27を除去し、開口部641,642,643内をTiNから成るゲート電極構成層27で埋め込む。こうして、ゲート電極層G1,G2,G3を得ることができる(図9A参照)。
その後、実施例1の[工程-140]と同様にして、フォトリソグラフィ技術及びエッチング技術に基づき、不要なシリコン層62を除去し、次いで、フォトリソグラフィ技術及びエッチング法に基づき、チャネル形成領域層CH1,CH2の上の保護層63を除去することで、シリコン層62から成るソース/ドレイン領域41,42を得ることができる。こうして、図9Bに示す構造を得ることができる。
次いで、全面に層間絶縁層(図示せず)を形成し、ソース/ドレイン領域41,42及びゲート電極層G1,G3の上方の層間絶縁層に開口を形成した後、開口を含む層間絶縁層上に導電層を形成し、フォトリソグラフィ技術及びエッチング技術に基づき導電層をパターニングすることで、第1コンタクト部431,433を得ることができるし、ソース/ドレイン領域41,42に接続された接続孔461,462を得ることができるし(図10A参照)、図示しない第1の配線を得ることができる。こうして、基体の上方に形成されており、第1の配線に接続された第1コンタクト部431,433を得ることができる。尚、第1の配線は、層間絶縁層上に形成されている。
その後、例えば、CMP法に基づき導電性基板60を裏面から薄くした後、周知の方法で、絶縁材料層61を貫通したゲート電極層G2の延在部27’に接続された第2コンタクト部452を導電性基板60の内部に形成し、併せて、導電性基板60の裏面上に、第2コンタクト部452に接続された第2の配線(図示せず)を形成する。こうして、図9C、図7A、図7B、図7Cに示す構造を得ることができる。
1.2≦t2/t1≦3
を例示することができ、具体的には、実施例4においては、
t2/t1=2.0
とした。t2/t1を上記のような関係とすることで、所謂マイクロローディング効果が生じる結果、ゲート電極層G2を形成すべきシリコン層62の領域及び絶縁材料層61の領域は除去される一方、ゲート電極層G1,G3を形成すべきシリコン層62の領域及び絶縁材料層61の領域の一部が除去される(図12A参照)。その結果、ゲート電極層G2の延在部27’は絶縁材料層61を貫通する一方、ゲート電極層G1,G3の延在部27”は絶縁材料層61内を延在しているが、絶縁材料層61を貫通してはいない状態を得ることができる(図12B参照)。
[A01]《半導体装置》
導電性基板の表面に絶縁材料層が形成された基体の絶縁材料層上に、N層のゲート電極層と(N-1)層のチャネル形成領域層(但し、N≧3)が交互に並置されて成る構造体を有し、
構造体は、底面、底面と対向する頂面、第1側面、第2側面、第1側面と対向した第3側面、及び、第2側面と対向した第4側面を有し、
チャネル形成領域層は、
構造体の底面を構成する底面、
構造体の頂面を構成する頂面、
構造体の第1側面を構成する第1側面、
第2側面、
構造体の第3側面を構成する第3側面、及び、
第2側面と対向した第4側面、
を有し、
ゲート電極層は、
構造体の底面を構成する底面、
構造体の頂面を構成する頂面、
構造体の第1側面を構成する第1側面、
第2側面、
構造体の第3側面を構成する第3側面、及び、
第2側面と対向した第4側面、
を有し、
第1番目のゲート電極層の第2面は、構造体の第2側面を構成し、
第N番目のゲート電極層の第4面は、構造体の第4側面を構成し、
第n番目(但し、n=1,2・・・(N-1))のチャネル形成領域層の第2面は、第n番目のゲート電極層の第4面と接しており、
第n番目のチャネル形成領域層の第4面は、第(n+1)番目のゲート電極層の第2面と接しており、
奇数番目のゲート電極層及び偶数番目のゲート電極層のいずれか一方は、第1コンタクト部に接続されており、他方は、第2コンタクト部に接続されている半導体装置。
[A02]チャネル形成領域層は、ナノワイヤー構造又はナノシート構造から成るチャネル構造部、及び、絶縁部から構成されている[A01]に記載の半導体装置。
[A03]チャネル形成領域層の第1面は、チャネル形成領域層に共通した一方のソース/ドレイン領域に接続されており、
チャネル形成領域層の第3面は、チャネル形成領域層に共通した他方のソース/ドレイン領域に接続されている[A01]又は[A02]に記載の半導体装置。
[A04]第1コンタクト部は、基体の上方に形成されており、第1の配線に接続されており、
ゲート電極層の延在部は絶縁材料層内を延びており、
ゲート電極層の延在部に接続された第2コンタクト部は、導電性基板に形成された第2の配線に接続されている[A01]乃至[A03]のいずれか1項に記載の半導体装置。
[A05]ゲート電極層の延在部は絶縁材料層を貫通している[A04]に記載の半導体装置。
[A06]構造体の第2側面から構造体の第4側面に向かう方向を第1の方向としたとき、第1の方向に沿った第2コンタクト部に接続されたゲート電極層の厚さは、第1の方向に沿った第1コンタクト部に接続されたゲート電極層の厚さよりも厚い[A04]又は[A05]に記載の半導体装置。
Claims (6)
- 導電性基板の表面に絶縁材料層が形成された基体の絶縁材料層上に、N層のゲート電極層と(N-1)層のチャネル形成領域層(但し、N≧3)が交互に並置されて成る構造体を有し、
構造体は、底面、底面と対向する頂面、第1側面、第2側面、第1側面と対向した第3側面、及び、第2側面と対向した第4側面を有し、
チャネル形成領域層は、
構造体の底面を構成する底面、
構造体の頂面を構成する頂面、
構造体の第1側面を構成する第1側面、
第2側面、
構造体の第3側面を構成する第3側面、及び、
第2側面と対向した第4側面、
を有し、
ゲート電極層は、
構造体の底面を構成する底面、
構造体の頂面を構成する頂面、
構造体の第1側面を構成する第1側面、
第2側面、
構造体の第3側面を構成する第3側面、及び、
第2側面と対向した第4側面、
を有し、
第1番目のゲート電極層の第2面は、構造体の第2側面を構成し、
第N番目のゲート電極層の第4面は、構造体の第4側面を構成し、
第n番目(但し、n=1,2・・・(N-1))のチャネル形成領域層の第2面は、第n番目のゲート電極層の第4面と接しており、
第n番目のチャネル形成領域層の第4面は、第(n+1)番目のゲート電極層の第2面と接しており、
奇数番目のゲート電極層及び偶数番目のゲート電極層のいずれか一方は、第1コンタクト部に接続されており、他方は、第2コンタクト部に接続されている半導体装置。 - チャネル形成領域層は、ナノワイヤー構造又はナノシート構造から成るチャネル構造部、及び、絶縁部から構成されている請求項1に記載の半導体装置。
- チャネル形成領域層の第1面は、チャネル形成領域層に共通した一方のソース/ドレイン領域に接続されており、
チャネル形成領域層の第3面は、チャネル形成領域層に共通した他方のソース/ドレイン領域に接続されている請求項1に記載の半導体装置。 - 第1コンタクト部は、基体の上方に形成されており、第1の配線に接続されており、
ゲート電極層の延在部は絶縁材料層内を延びており、
ゲート電極層の延在部に接続された第2コンタクト部は、導電性基板に形成された第2の配線に接続されている請求項1に記載の半導体装置。 - ゲート電極層の延在部は絶縁材料層を貫通している請求項4に記載の半導体装置。
- 構造体の第2側面から構造体の第4側面に向かう方向を第1の方向としたとき、第1の方向に沿った第2コンタクト部に接続されたゲート電極層の厚さは、第1の方向に沿った第1コンタクト部に接続されたゲート電極層の厚さよりも厚い請求項4に記載の半導体装置。
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- 2019-01-16 US US16/964,648 patent/US11276768B2/en active Active
- 2019-01-16 CN CN201980007106.5A patent/CN111527611A/zh active Pending
- 2019-01-16 DE DE112019000654.1T patent/DE112019000654T5/de active Pending
- 2019-01-16 KR KR1020207018089A patent/KR102720250B1/ko active Active
- 2019-01-16 JP JP2019568979A patent/JP7242565B2/ja active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20240099215A (ko) | 2021-11-12 | 2024-06-28 | 소니그룹주식회사 | 반도체 장치 |
| DE112022005439T5 (de) | 2021-11-12 | 2024-08-29 | Sony Group Corporation | Halbleitervorrichtung |
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| JP7242565B2 (ja) | 2023-03-20 |
| US11881521B2 (en) | 2024-01-23 |
| US20240038875A1 (en) | 2024-02-01 |
| US20210057548A1 (en) | 2021-02-25 |
| KR102720250B1 (ko) | 2024-10-22 |
| US20220157971A1 (en) | 2022-05-19 |
| TW201935573A (zh) | 2019-09-01 |
| KR20200116909A (ko) | 2020-10-13 |
| TWI788501B (zh) | 2023-01-01 |
| JPWO2019150947A1 (ja) | 2021-01-14 |
| DE112019000654T5 (de) | 2020-10-15 |
| US11276768B2 (en) | 2022-03-15 |
| CN111527611A (zh) | 2020-08-11 |
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