WO2020021913A1 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- WO2020021913A1 WO2020021913A1 PCT/JP2019/024075 JP2019024075W WO2020021913A1 WO 2020021913 A1 WO2020021913 A1 WO 2020021913A1 JP 2019024075 W JP2019024075 W JP 2019024075W WO 2020021913 A1 WO2020021913 A1 WO 2020021913A1
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Definitions
- the present disclosure relates to a semiconductor device, and more specifically, to a semiconductor device including a field-effect transistor having a nanowire structure or a nanosheet structure.
- MOSFETs with a bulk planar structure were the mainstream up to the 20 nm generation, but from the 14 nm generation onwards, FETs having a Fin structure (for convenience, “Fin-FET” (Hereinafter referred to as "FD-SOI.FET” for the sake of convenience) having an FD-SOI (Fully Depleted-Silicon On On Insulator) structure.
- Fin-FET Fin-FET
- FD-SOI.FET Fin-SOI (Fully Depleted-Silicon On On Insulator) structure.
- the thickness of the silicon layer 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.
- the limit of the thickness of the silicon layer is 5 nm.
- Nanowire FET As a technique for overcoming the limitation of the thickness of the silicon layer constituting the channel formation region of the FET, a field effect transistor having a channel formation region having a nanowire structure (referred to as a “nanowire FET” for convenience) (See, for example, JP-A-2005-195405). Nanowire FETs have at least two nanowire structures. Such a nanowire FET is driven at, for example, 0.5 volt to 0.8 volt.
- a semiconductor device may include not only a nanowire FET but also, for example, a field effect transistor (for convenience, referred to as a “second FET”) driven at 1.5 volts to 3.3 volts. , Often required.
- a field effect transistor for convenience, referred to as a “second FET” driven at 1.5 volts to 3.3 volts. , Often required.
- a nanowire FET and a second FET are usually formed at the same time.
- a thick gate insulating layer is formed in the second FET. It is difficult to form a film.
- the second FET there is a strong demand for controlling the threshold voltage Vth by applying a back bias.
- a first object of the present disclosure is to provide a semiconductor device in which a second FET having a gate insulating film relatively thicker than a nanowire FET and a nanowire FET are mixed.
- a second object of the present disclosure is to provide a semiconductor device in which a second FET having a configuration and a structure to which a back bias can be applied and a nanowire FET are mixed.
- a semiconductor device for achieving the first object, Substrate, A first electric field in which at least two channel structures each including a channel portion having a nanowire structure or a nanosheet structure, a gate insulating film surrounding the channel portion, and a gate electrode surrounding at least a part of the gate insulating film are stacked.
- a second field-effect transistor including a channel forming layer, a gate insulating layer surrounding the channel forming layer, and a gate electrode surrounding at least a part of the gate insulating layer;
- the first field-effect transistor and the second field-effect transistor are formed above the base, The channel portions of the first field-effect transistor are spaced apart from each other in the stacking direction of the channel structure portion,
- T 2 ⁇ (L 1/2 ) Preferably, T 2 ⁇ 1.1 ⁇ (L 1 /2) More preferably, T 2 ⁇ 1.2 ⁇ (L 1 /2) To be satisfied.
- a semiconductor device for achieving the above second object, Substrate, A first electric field in which at least two channel structures each including a channel portion having a nanowire structure or a nanosheet structure, a gate insulating film surrounding the channel portion, and a gate electrode surrounding at least a part of the gate insulating film are stacked.
- a second field effect transistor including a channel forming layer, a gate insulating layer formed on the top surface and side surfaces of the channel forming layer, and a gate electrode formed on at least the top surface of the gate insulating layer;
- the first field-effect transistor and the second field-effect transistor are formed above the base,
- the channel portions of the first field-effect transistor are spaced apart from each other in the stacking direction of the channel structure portion,
- An insulating material layer is formed between the bottom surface of the channel forming layer constituting the second field effect transistor and the surface of the base.
- FIG. 1 is a schematic partial cross-sectional view of the semiconductor device according to the first embodiment.
- 2A and 2B are schematic partial cross-sectional views of the first field-effect transistor in the semiconductor device according to the first embodiment.
- 3A and 3B are diagrams illustrating a schematic arrangement of a channel portion, a channel formation layer, and a source / drain region of a first field-effect transistor in a semiconductor device according to the present disclosure, and a second view in a semiconductor device according to the present disclosure.
- FIG. 3 is a diagram illustrating a schematic arrangement of a channel portion, a channel formation layer, and a source / drain region of a field-effect transistor.
- FIG. 1 is a schematic partial cross-sectional view of the semiconductor device according to the first embodiment.
- 2A and 2B are schematic partial cross-sectional views of the first field-effect transistor in the semiconductor device according to the first embodiment.
- 3A and 3B are diagrams illustrating a schematic arrangement of a channel portion, a channel formation layer,
- FIG. 4 is a schematic partial cross-sectional view of a modification (Modification 1) of the semiconductor device of Embodiment 1.
- FIG. 5 is a schematic partial cross-sectional view of a modification (modification 4) of the semiconductor device of the first embodiment.
- FIG. 6 is a schematic partial cross-sectional view of the semiconductor device according to the second embodiment.
- FIG. 7 is a schematic partial cross-sectional view of a modification of the semiconductor device of the second embodiment.
- FIGS. 8A, 8B, and 8C are schematic diagrams of a substrate and the like similar to those taken along arrows AA and BB in FIGS. 3A and 3B for explaining the method of manufacturing the semiconductor device of the first embodiment.
- FIGS. 9A and 9B are views similar to FIG.
- FIGS. 8C for explaining a method of manufacturing the semiconductor device of the first embodiment, such as a substrate similar to the arrow AA in FIG. 3A and the arrow BB in FIG. 3B.
- FIGS. 10A and 10B are views similar to FIGS. 9B and 9B for explaining a method of manufacturing the semiconductor device of the first embodiment, such as a substrate similar to the arrows AA in FIGS. 3A and BB in FIG. 3B.
- FIGS. 11A and 11B are views similar to FIGS. 10B and 10B for explaining a method of manufacturing the semiconductor device of the first embodiment, such as a substrate similar to the arrow AA in FIG. 3A and the arrow BB in FIG.
- FIG. 12 is a schematic view of a substrate and the like similar to those taken along arrows AA in FIG. 3A and arrows BB in FIG. 3B for explaining the method for manufacturing the semiconductor device of Example 1 following FIG. 11B.
- FIG. 13 is a schematic view of a substrate and the like similar to those taken along arrows AA and BB in FIG. 3A and FIG.
- FIG. 14 is a schematic view of a substrate and the like similar to those taken along arrows AA in FIG. 3A and arrows BB in FIG. 3B for explaining the method for manufacturing the semiconductor device of Example 1 following FIG. It is a partial sectional view.
- FIG. 15 is a schematic view of a substrate and the like similar to the arrows AA in FIG. 3A and the arrows BB in FIG. 3B for explaining the method for manufacturing the semiconductor device of the first embodiment, following FIG. It is a partial sectional view.
- FIG. 16 is a schematic diagram of a substrate and the like similar to the arrows AA in FIG. 3A and the arrows BB in FIG. 3B for explaining the method of manufacturing the semiconductor device of the first embodiment, following FIG. It is a partial sectional view.
- FIG. 17 is a continuation of FIG. 16 for explaining a method of manufacturing the semiconductor device of the first embodiment, and is a schematic diagram of a base and the like similar to the arrows AA in FIG.
- FIG. 18 is a schematic diagram of a substrate and the like similar to those taken along arrows AA in FIG. 3A and arrows BB in FIG. 3B for explaining the method for manufacturing the semiconductor device of Example 1 following FIG. It is a partial sectional view.
- FIGS. 19A, 19B, and 19C are a schematic partial cross-sectional view and a schematic partial plan view of the first field-effect transistor during the manufacturing process of the semiconductor device according to the first embodiment. It is.
- FIGS. 20A, 20B, and 20C are a schematic partial cross-sectional view and a schematic partial plan view of the second field-effect transistor during the manufacturing process of the semiconductor device according to the first embodiment.
- FIGS. 21A, 21B, and 21C are schematic diagrams of the first field-effect transistor during the manufacturing process of the semiconductor device of the first embodiment, following FIGS. 19A, 19B, and 19C. It is a typical partial sectional view and a schematic partial plan view.
- (A), (B) and (C) of FIG. 22 are schematic diagrams of the second field-effect transistor in the course of the manufacturing process of the semiconductor device of Example 1, following FIGS. 20 (A), (B) and (C). It is a typical partial sectional view and a schematic partial plan view.
- FIGS. 23A, 23B, and 23C are schematic diagrams of the first field-effect transistor during the manufacturing process of the semiconductor device of the first embodiment, following FIGS. 21A, 21B, and 21C.
- FIGS. 24A, 24B, and 24C are schematic diagrams of the second field-effect transistor during the manufacturing process of the semiconductor device of the first embodiment, following FIGS. 22A, 22B, and 22C. It is a typical partial sectional view and a schematic partial plan view.
- FIGS. 25A, 25B, and 25C are schematic diagrams of the first field-effect transistor during the manufacturing process of the semiconductor device of the first embodiment, following FIGS. 23A, 23B, and 23C. It is a typical partial sectional view and a schematic partial plan view.
- FIGS. 26A, 26B, and 26C are schematic diagrams of the second field-effect transistor during the manufacturing process of the semiconductor device according to the first embodiment, following FIGS.
- FIGS. 27A, 27B, and 27C are schematic diagrams of the first field-effect transistor during the manufacturing process of the semiconductor device according to the first embodiment, following FIGS. 25A, 25B, and 25C. It is a typical partial sectional view and a schematic partial plan view.
- (A), (B) and (C) of FIG. 28 are schematic diagrams of the second field-effect transistor in the middle of the manufacturing process of the semiconductor device of Example 1 following (A), (B) and (C) of FIG. It is a typical partial sectional view and a schematic partial plan view.
- FIGS. 29A, 29B, and 29C are schematic diagrams of the first field-effect transistor during the manufacturing process of the semiconductor device according to the first embodiment, following FIGS. 27A, 27B, and 27C. It is a typical partial sectional view and a schematic partial plan view.
- FIGS. 30A, 30B, and 30C are schematic diagrams of the second field-effect transistor during the manufacturing process of the semiconductor device according to the first embodiment, following FIGS. 28A, 28B, and 28C. It is a typical partial sectional view and a schematic partial plan view.
- (A), (B) and (C) of FIG. 31 are schematic diagrams of the first field-effect transistor in the course of the manufacturing process of the semiconductor device of Example 1, following FIGS. 27 (A), (B) and (C).
- FIGS. 32A, 32B, and 32C are schematic diagrams of the second field-effect transistor during the manufacturing process of the semiconductor device according to the first embodiment, following FIGS. 28A, 28B, and 28C. It is a typical partial sectional view and a schematic partial plan view.
- FIGS. 33A, 33B, and 33C are schematic diagrams of the first field-effect transistor during the manufacturing process of the semiconductor device of the first embodiment, following FIGS. 29A, 29B, and 29C. It is a typical partial sectional view and a schematic partial plan view. (A), (B) and (C) of FIG.
- FIGS. 34 are schematic diagrams of the second field-effect transistor during the manufacturing process of the semiconductor device of the first embodiment, following FIGS. 30 (A), (B) and (C). It is a typical partial sectional view and a schematic partial plan view.
- FIGS. 35A, 35B, and 35C are schematic diagrams of the first field-effect transistor during the manufacturing process of the semiconductor device of the first embodiment, following FIGS. 33A, 33B, and 33C. It is a typical partial sectional view and a schematic partial plan view.
- (A), (B) and (C) of FIG. 36 are schematic diagrams of the second field-effect transistor in the course of the manufacturing process of the semiconductor device of Example 1, following FIGS. 34 (A), (B) and (C).
- FIGS. 37A, 37B, and 37C are schematic diagrams of the first field-effect transistor during the manufacturing process of the semiconductor device of the first embodiment, following FIGS. 35A, 35B, and 35C. It is a typical partial sectional view and a schematic partial plan view.
- FIGS. 38A, 38B, and 38C are schematic diagrams of the second field-effect transistor during the manufacturing process of the semiconductor device according to the first embodiment, following FIGS. 36A, 36B, and 38C. It is a typical partial sectional view and a schematic partial plan view.
- FIGS. 38A, 38B, and 38C are schematic diagrams of the second field-effect transistor during the manufacturing process of the semiconductor device according to the first embodiment, following FIGS. 36A, 36B, and 38C. It is a typical partial sectional view and a schematic partial plan view.
- FIGS. 36A, 36B, and 38C It is a typical partial sectional view and a schematic partial plan view.
- FIGS. 39A, 39B, and 39C are schematic diagrams of the first field-effect transistor during the manufacturing process of the semiconductor device according to the first embodiment, following FIGS. 37A, 37B, and 37C. It is a typical partial sectional view and a schematic partial plan view.
- FIGS. 40A, 40B, and 40C are schematic diagrams of the second field-effect transistor during the manufacturing process of the semiconductor device of the first embodiment, following FIGS. 38A, 38B, and 38C. It is a typical partial sectional view and a schematic partial plan view.
- FIGS. 41A, 41B, and 41C are schematic diagrams of the first field-effect transistor during the manufacturing process of the semiconductor device of the first embodiment, following FIGS. 39A, 39B, and 39C.
- FIGS. 42A, 42B, and 42C are schematic diagrams of the second field-effect transistor during the manufacturing process of the semiconductor device of the first embodiment, following FIGS. 40A, 40B, and 40C. It is a typical partial sectional view and a schematic partial plan view.
- FIG. 43 is a schematic partial cross-sectional view of a substrate and the like similar to arrows AA in FIG. 3A and arrows BB in FIG. 3B for explaining the method of manufacturing the semiconductor device of the second embodiment. is there.
- FIGS. 44A, 44B, and 44C are schematic partial cross-sectional views of the second field-effect transistor during the manufacturing process of the semiconductor device according to the second embodiment, and FIGS. FIG.
- FIGS. 45A, 45B, and 45C are schematic diagrams of the second field-effect transistor during the manufacturing process of the semiconductor device according to the second embodiment, following FIGS. 44A, 44B, and 45C. It is a typical partial sectional view and a schematic partial plan view.
- FIGS. 46A, 46B, and 46C are schematic diagrams of the second field-effect transistor during the manufacturing process of the semiconductor device according to the second embodiment, following FIGS. 45A, 45B, and 45C. It is a typical partial sectional view and a schematic partial plan view.
- FIGS. 47A, 47B, and 47C are schematic diagrams of the second field-effect transistor during the manufacturing process of the semiconductor device according to the second embodiment, following FIGS. 46A, 46B, and 47C.
- FIGS. 48A, 48B, and 48C are schematic diagrams of the second field-effect transistor during the manufacturing process of the semiconductor device according to the second embodiment, following FIGS. 47A, 47B, and 47C. It is a typical partial sectional view and a schematic partial plan view.
- FIGS. 49A, 49B, and 49C are schematic diagrams of the second field-effect transistor during the manufacturing process of the semiconductor device according to the second embodiment, following FIGS. 48A, 48B, and 49C. It is a typical partial sectional view and a schematic partial plan view.
- FIGS. 48A, 48B, and 48C are schematic diagrams of the second field-effect transistor during the manufacturing process of the semiconductor device according to the second embodiment, following FIGS. 48A, 48B, and 49C. It is a typical partial sectional view and a schematic partial plan view.
- FIGS. 48A, 48B, and 48C are schematic diagrams of the second field-effect transistor during the manufacturing process of the semiconductor device according to the second embodiment, following FIGS. 48A,
- 50A, 50B, and 50C are schematic diagrams of the second field-effect transistor during the manufacturing process of the semiconductor device of the second embodiment, following FIGS. 49A, 49B, and 50C. It is a typical partial sectional view and a schematic partial plan view.
- the thickness of the gate insulating film of the first field effect transistor has a T 1
- T 2 ⁇ 2 ⁇ T 1 Preferably, T 2 ⁇ 3 ⁇ T 1 Is satisfied.
- a second field-effect transistor having a gate insulating film relatively thicker than the first field-effect transistor can be reliably obtained.
- the thickness of the channel portion is T 1 -CH
- the thickness of the channel forming layer is T 2 -CH .
- T 2-CH ⁇ 2 ⁇ T 1-CH Preferably, T 2-CH ⁇ 3 ⁇ T 1-CH Is satisfied.
- the semiconductor device including various preferable embodiments described above, at least a part of the lowermost channel portion forming the first field-effect transistor is surrounded by the first gate electrode. And the other channel portion may be surrounded by the second gate electrode.
- an insulating layer (for convenience, “first insulating layer”) is provided between the first gate electrode and the substrate surface. ] May be formed).
- a structure in which at least a part of the lowermost channel portion of the first field-effect transistor is surrounded by the first gate electrode and the other channel portions are surrounded by the second gate electrode is described in the present disclosure.
- the present invention can be applied to the first field-effect transistor in the semiconductor device according to the second aspect.
- the gate insulating film is formed between the channel portion of the first field-effect transistor and the first gate electrode and between the channel portion of the first field-effect transistor and the second gate electrode. ing. That is, in the first field-effect transistor, between the channel portions, a gate insulating film surrounding the channel portion located below (ie, a gate insulating film formed on the outer peripheral portion of the channel portion), and A gate insulating film surrounding the channel portion located above (ie, a gate insulating film formed on an outer peripheral portion of the channel portion) is formed, and further, a gate electrode is formed between these gate insulating films. I have. As described above, the space between the channel portions is filled with the gate insulating film and the gate electrode.
- the sum of the heights of the channel portions is the sum of the diameters of the materials (for example, Si, SiGe, Ge, InGaAs) constituting the nanowire structure constituting the channel portion when the gate insulating film and the gate electrode are removed, or ,
- a gate electrode included in the second field-effect transistor may be referred to as a “third gate electrode” for convenience.
- the third gate electrode surrounds at least a part of the gate insulating layer, but the third gate electrode has a gate insulating layer.
- the third gate electrode surrounds a part of the gate insulating layer.
- a third gate electrode is formed between the surface of the base and the gate insulating layer via an insulating layer (for convenience, sometimes referred to as a “second insulating layer”).
- the thickness of the second insulating layer is larger than the thickness of the first insulating layer described above.
- the third gate electrode is formed on the top surface and the side surface of the channel forming layer via the gate insulating layer, but is formed between the base surface and the gate insulating layer.
- L 2 T 2 .
- the second field-effect transistor includes an n-channel field-effect transistor and a p-channel field-effect transistor,
- the channel forming layer of the n-channel field effect transistor is made of silicon (Si)
- the channel forming layer of the p-channel field effect transistor can be made of silicon (Si) or silicon-germanium (SiGe).
- the first field-effect transistor includes an n-channel field-effect transistor and a p-channel field-effect transistor,
- the channel portion of the n-channel field effect transistor is made of silicon (Si)
- the channel portion of the p-channel field effect transistor can be made of silicon-germanium (SiGe), germanium (Ge), or InGaAs.
- the channel portion of the n-channel field effect transistor is made of silicon-germanium (SiGe),
- the channel portion of the p-channel field effect transistor can be made of silicon (Si), germanium (Ge), or InGaAs;
- the channel portion of the n-channel field effect transistor is made of germanium (Ge),
- the channel portion of the p-channel field effect transistor can be made of silicon (Si), silicon-germanium (SiGe), or InGaAs;
- the channel portion of the n-channel field effect transistor is made of InGaAs,
- the channel portion of the p-channel field-effect transistor may be made of silicon (Si), silicon-germanium (SiGe), or germanium (Ge).
- a back bias is applied to a portion of the base opposed to the bottom surface of the channel formation layer via the insulating material layer. be able to.
- the thickness of the channel portion is T 1 -CH
- the thickness of the insulating material layer is T Ins
- 0.2 ⁇ T 1-CH / T Ins ⁇ 2 Preferably, 0.5 ⁇ T 1-CH / T Ins ⁇ 1 Is satisfied.
- the semiconductor device in the second aspect of the present disclosure including the above-described preferred embodiment, at least between the channel formation layer and the insulating material layer A structure in which one semiconductor layer is formed can be employed.
- an interlayer insulating layer can be formed between the channel formation layer and the semiconductor layer and between the semiconductor layer and the semiconductor layer. This makes it possible to apply a back bias by applying an appropriate potential to the semiconductor layer.
- the semiconductor layer can be configured to have a conductivity type opposite to the conductivity type of the channel formation layer.
- the threshold voltage Vth is usually determined only by the work function of the material forming the gate electrode.
- the threshold voltage Vth can be controlled, and the optimum desired threshold voltage Vth as a circuit can be set. For example, it is possible to increase the speed of the circuit by lowering the threshold voltage V th, it is possible to achieve a low leakage current by increasing the threshold voltage V th.
- the first field-effect transistor may be a low-breakdown-voltage, field-effect transistor
- the second field-effect transistor may be a high-breakdown-voltage, field-effect transistor.
- the voltage applied to the gate electrode of the first field effect transistor is, for example, 0.5 volt to 0.8 volt
- the voltage applied to the gate electrode of the second field effect transistor is, for example, , 1.5 volts to 3.3 volts.
- a transistor is suitable as a low-breakdown-voltage / field-effect transistor or a high-breakdown-voltage / field-effect transistor depends on the total cross-sectional area of the channel portion and the channel formation layer and the thickness of the gate insulating film and the gate insulating layer. Dependent.
- Whether the first field-effect transistor is an n-channel type or a p-channel type is determined, for example, by a work function of a material forming a gate electrode.
- Whether the second field-effect transistor is an n-channel type or a p-channel type is determined by, for example, a work function of a material forming a gate electrode.
- the channel portion or the channel formation layer is made of Si
- TiN, TaN, Al, TiAl, W can be mentioned.
- TiN and W can be used as materials forming the gate electrode.
- SiON and SiO 2 can be mentioned, and a high dielectric constant material (a so-called High-k material) such as HfO 2 , HfAlON, and Y 2 O 3 can be used. Can be mentioned.
- a silicon semiconductor substrate or an SOI substrate can be used as the base.
- the channel portion and the channel forming layer preferably have crystallinity, but may be made of polycrystal, or may be made of amorphous in some cases.
- a material for forming the semiconductor layer a material for forming a channel portion or a channel formation layer, specifically, silicon (Si), silicon-germanium (SiGe), germanium (Ge), or InGaAs can be given.
- Examples of a method for forming a channel portion, a channel formation layer, and a semiconductor layer include an epitaxial CVD method, a plasma CVD method, and an atomic layer CVD method.
- the number of channel structure portions in the thickness direction of the first field effect transistor may be two or more, and the number of channel structure portions in the direction orthogonal to the thickness direction of the first field effect transistor. May be 1 or 2 or more.
- both ends of a wire structure having a diameter of, for example, 5 nm to 10 nm made of, for example, Si or SiGe are formed as source / drain forming the first field effect transistor. Supported by the area.
- the cross-sectional shape of, for example, Si or SiGe having a width and thickness of, for example, (10 nm to 50 nm) ⁇ (5 nm to 10 nm) is substantially rectangular.
- Source / drain regions constituting the first field-effect transistor are supported by source / drain regions constituting the first field-effect transistor. Whether the structure is a nanowire structure or a nanosheet structure depends on the thickness and width of the materials constituting these structures.
- a channel forming layer forming the second field-effect transistor is supported by source / drain regions forming the second field-effect transistor.
- a digital circuit such as a logic circuit, an SRAM circuit, or a CMOS circuit is configured by a first field-effect transistor, and a transistor that transmits and receives signals to and from the outside is configured by a second field-effect transistor.
- Example 1 relates to the semiconductor device according to the first embodiment of the present disclosure.
- FIGS. 1, 2A, and 2B are schematic partial cross-sectional views of the semiconductor device of the first embodiment.
- the channel portion, the channel formation layer, and the source / drain region of the first field-effect transistor in the semiconductor device of the first embodiment are shown.
- 3A and FIG. 3B shows a schematic arrangement of a channel portion, a channel formation layer, and a source / drain region of the second field-effect transistor.
- FIG. 1 shows an arrow A of FIG. 3A.
- 2A and 2B are schematic partial cross-sectional views along arrows BB in FIG. 3B
- FIGS. 2A and 2B are schematic partial cross-sectional views along arrows AA in FIG. 3A.
- FIG. 1 is a schematic partial cross-sectional view of one channel structure in an n-channel first field-effect transistor, and a schematic view of one channel structure in a p-channel first field-effect transistor.
- FIG. 2 shows a partial cross-sectional view and a schematic partial cross-sectional view of an n-channel second field-effect transistor and a p-channel second field-effect transistor.
- FIG. 2A is a schematic partial cross-sectional view of an n-channel first field-effect transistor
- FIG. 2B is a schematic partial cross-sectional view of a p-channel first field-effect transistor. Show.
- FIG. 1 is a sectional view, but hatching lines are omitted.
- the semiconductor device of the first embodiment is Base 30, At least one of channel portions 13n, 13p having a nanowire structure or a nanosheet structure (in the illustrated example, having nanowire structures 12n, 12p), a gate insulating film 14 surrounding the channel portions 13n, 13p, and a gate insulating film 14 First field-effect transistor in which at least two (in the illustrated example, three in the direction in which the channel structures 11n and 11p are stacked) at least two channel structures 11n and 11p provided with gate electrodes 17n and 17p surrounding the first field-effect transistor 10n, 10p, and The channel forming layers 23n and 23p, the gate insulating layer 24 surrounding the channel forming layers 23n and 23p, and the gate electrodes 27n and 27p surrounding at least a part of the gate insulating layer 24 (in the illustrated example, surrounding the gate insulating layer 24).
- Second field-effect transistors 20n and 20p Has, The first field-effect transistors 10n and 10p and the second field-effect transistors 20n and 20p are formed above the base 30.
- the channel portions 13n and 13p of the first field-effect transistors 10n and 10p are arranged apart from each other in the stacking direction of the channel structure portions 11n and 11p.
- the distance between the channel portions 13n and 13p of the first field-effect transistors 10n and 10p and the channel portions 13n and 13p is L 1
- the thickness of the gate insulating layer 24 of the second field-effect transistors 20n and 20p is T 2
- T 2 ⁇ (L 1/2 ) Preferably, T 2 ⁇ 1.1 ⁇ (L 1 /2) More preferably, T 2 ⁇ 1.2 ⁇ (L 1 /2) To be satisfied.
- FIGS. 2A and 2B there are three channel structure portions 11n and 11p in the width direction.
- FIG. 1 illustrates one of the channel structures 11n and 11p.
- the cross-sectional shape of the first field-effect transistor differs between FIG. 1 and FIGS. 2A and 2B because one channel structure is illustrated in FIG. The same applies to a second embodiment described later.
- the distance to 23p was L 2, L 2 ⁇ L 1 L 2 ⁇ T 2 Preferably, L 2 ⁇ 2 ⁇ L 1 To be satisfied.
- the thickness of the gate insulating film 14 of 10p was T 1, T 2 ⁇ 2 ⁇ T 1
- T 2-CH ⁇ 2 ⁇ T 1-CH T 2-CH ⁇ 3 ⁇ T 1-CH
- T 1-CH 8 nm
- T 2-CH 16 nm
- T 1 2 nm
- T 2 6 nm
- L 1 8 nm
- L 2 16 nm
- At least a portion of the lowermost channel portion of the first field-effect transistor is surrounded by the first gate electrode, and the other channel portions are surrounded by the second gate electrode. More specifically, in the illustrated example, the lowermost channel portion 13n of the first field-effect transistor 10n is surrounded by the gate electrode 17n, and the other channel portions 13n (the second and uppermost channel portions) are formed. The channel portion 13n) is also surrounded by the gate electrode 17n. The same applies to the first field-effect transistors 10n and 10p in the semiconductor device according to the second embodiment described later.
- the gate electrode 17p a part of the lowermost channel portion 13p constituting the first field effect transistor 10p is surrounded by the gate electrode 17p, and the other channel portions 13p (the second layer and the uppermost layer channel portion 13p) are gated. It is surrounded by the electrode 17p. Further, the gate electrodes (third gate electrodes) 27n and 27p of the second field-effect transistors 20n and 20p are at least part of the gate insulating layer 24 (in the illustrated example, the entire outer peripheral portion of the gate insulating layer 24). Is surrounded.
- the lowermost channel portion 13n of the first field-effect transistor 10n is surrounded by a first gate electrode 17n, and a first insulating layer 14 is provided between the first gate electrode 17n and the surface of the base 30. 'Has been formed. Further, gate electrodes 27n and 27p are formed between the gate insulating layer 24 constituting the second field-effect transistors 20n and 20p and the surface of the base 30 with a second insulating layer 24 'interposed therebetween. The thickness of the second insulating layer 24 'is larger than the thickness of the first insulating layer 14'. As the relationship between the 'thickness T 1 of the' thickness of T 2 'the second insulating layer 24 and the first insulating layer 14, for example, T 2 '/ T 1 ' ⁇ 3 Can be mentioned.
- a gate insulating film 14 is formed between the channel portions 13n and 13p of the first field-effect transistors 10n and 10p and the first gate electrodes 17n and 17p, and between the channel portions 13n and 13p of the first field-effect transistors 10n and 10p and the second gate electrode 17n. , 17p. That is, in the first field-effect transistors 10n and 10p, between the channel portions 13n and 13p and the channel portions 13n and 13p, a gate insulating film surrounding the channel portion located below (that is, the outer periphery of the channel portions 13n and 13p).
- a gate insulating film that is, a gate insulating film formed on the outer periphery of the channel portion surrounding the channel portions 13n and 13p located above. Further, gate electrodes 17n and 17p are formed between these gate insulating films 14. As described above, the space between the channel portions 13n and 13p and the channel portions 13n and 13p is buried with the gate insulating film 14 and the gate electrodes 17n and 17p. The sum of the heights (thicknesses) of the channel portions 13n and 13p is determined by the material of the nanowire structures 12n and 12p constituting the channel portions 13n and 13p when the gate insulating film 14 and the gate electrodes 17n and 17p are excluded. This is the total thickness. The same can be applied to a second embodiment described later.
- the third gate electrodes 27n and 27p surround at least a part of the gate insulating layer 24, but the third gate electrodes 27n and 27p have the gates as illustrated. In some cases, the third gate electrodes 27n and 27p may partially surround the gate insulating layer 24, as described later. In the illustrated example, third gate electrodes 27n and 27p are formed between the surface of the base 30 and the gate insulating layer 24.
- the second field-effect transistor includes an n-channel field-effect transistor 20n and a p-channel field-effect transistor 20p, and a channel forming layer of the n-channel field-effect transistor 20n.
- 23n is made of silicon (Si)
- the channel forming layer 23p of the p-channel field effect transistor 20p is made of silicon-germanium (SiGe).
- the first field-effect transistor includes an n-channel field-effect transistor 10n and a p-channel field-effect transistor 10p.
- the channel portion 13n of the n-channel field-effect transistor 10n is made of silicon (Si) and has a p-channel structure.
- the channel portion 13p of the field effect transistor 10p is made of silicon-germanium (SiGe).
- the gate electrodes 17n, 17p, 27n, 27p, TiN, TaN, Al, TiAl, W specifically, for example, TiN can be mentioned.
- the gate insulating film 15 and the gate insulating layer 25 constituting a part (lower layer) of the gate insulating film 14 and the gate insulating layer 24 are made of SiO 2 , and constitute the rest (upper layer) of the gate insulating film 14 and the gate insulating layer 24.
- the gate insulating film 16 and the gate insulating layer 26 are made of a high dielectric constant material, specifically, for example, HfO 2 .
- the base 30 is made of a silicon semiconductor substrate.
- An element isolation region 70 made of an insulating material 71 is formed in the base 30. The same can be applied to a second embodiment described later.
- Both ends of the channel portions 13n and 13p are supported by source / drain regions 18n and 18p constituting the first field-effect transistors 10n and 10p, and both ends of the channel forming layers 23n and 23p are connected to the second field-effect transistors 20n and 20p. It is supported by source / drain regions 28n and 28p constituting 20p. The same can be applied to a second embodiment described later.
- the first field-effect transistors 10n and 10p are low-breakdown-voltage and field-effect transistors
- the second field-effect transistors 20n and 20p are high-breakdown-voltage and field-effect transistors.
- the voltage applied to the gate electrodes 17n and 17p of the first field effect transistors 10n and 10p is 0.5 volt to 0.8 volt, and is applied to the gate electrodes 27n and 27p of the second field effect transistors 20n and 20p.
- the voltage is between 1.5 volts and 3 volts. The same can be applied to a second embodiment described later.
- FIGS. 8A, 8B, 8C, 9A, 9B, 10A, and 10A are schematic partial cross-sectional views similar to those taken along arrows AA in FIG. 3A and arrows BB in FIG. 3B.
- FIGS. 10B, 11A, 11B, 12, 13, 13, 14, 15, 16, 17, and 18, and the first field-effect transistor the same as along arrow AA in FIG. 3A (Shown by (A) in each drawing, and also refer to arrows AA in FIG. 19 (C)), and similar schematic cross-sectional views along arrows A′-A ′ in FIG.
- a partial cross-sectional view shown by (B) in each drawing, also see arrow BB in (C) of FIG.
- FIG. 19 and a schematic partial plan view (shown by (C) in each drawing) are drawn. 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 4
- a schematic partial cross-sectional view similar to that taken along arrow BB in FIG. 3B (shown in each drawing as (A), and also see arrow AA in FIG. 20C)
- a schematic partial cross-sectional view similar to that taken along arrow B′-B ′ in FIG. 3B shown by (B) in each drawing, and also see arrow BB in FIG. 20 (C)
- the region of the substrate 30 where the first field-effect transistor 10n is to be formed is the first region 31
- the region of the substrate 30 where the first field-effect transistor 10p is to be formed is the second region 32
- the second electric field is the region of the substrate 30 where the effect transistor 20n is to be formed.
- the region of the substrate 30 where the effect transistor 20n is to be formed may be referred to as a third region 33
- the region of the substrate 30 where the second field effect transistor 20p may be referred to as a fourth region 34.
- the first region 31, the second region 32, the third region 33, and the fourth region 34 are represented by reference numerals [31], [32], [33], and [34]. 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 30, 31, 32, 33, 34, In each of FIGS. 35, 36, 37, 38, 39, 40, 41, and 42, (A), the first Si—Ge layer 41, the first Si layer 42, the second Hatching lines are omitted in the Si—Ge layer 43, the second Si layer 44, the third Si—Ge layer 45, the third Si layer 46, and the fourth Si—Ge layer 47. Further, when various processings in a certain area have an undesired effect on another area, a mask layer or the like may be provided in another area as necessary, but the description of such a mask layer is omitted. I do.
- Step-100A First, a first Si-Ge layer 41 is formed on the first region 31, the second region 32, the third region 33, and the fourth region 34 of the base 30 by a known method (see FIG. 8A). The first Si-Ge layer 41 on 34 is removed by a known method. Thus, the structure shown in FIG. 8B can be obtained.
- Step-100B Next, after the first Si layer 42 is formed on the entire surface by a known method (see FIG. 8C), the first Si layer 42 on the third region 33 is removed by a known method. Thus, the structure shown in FIG. 9A can be obtained.
- Step-100C Next, after forming a second Si-Ge layer 43 on the entire surface by a known method (see FIG. 9B), the second Si-layer 43 on the fourth region 34 is removed by a known method. Thus, the structure shown in FIG. 10A can be obtained.
- Step-100D Next, a second Si layer 44 is formed on the entire surface by a known method. Thus, the structure shown in FIG. 10B can be obtained.
- Step-100E Next, after forming a third Si-Ge layer 45 on the entire surface by a known method (see FIG. 11A), the third Si-layer 45 on the third region 33 is removed by a known method. Thus, the structure shown in FIG. 11B can be obtained.
- Step-100F Next, after forming a third Si layer 46 on the entire surface by a known method (see FIG. 12), the third Si layer 46 on the fourth region 34 is removed by a known method. Thus, the structure shown in FIG. 13 can be obtained.
- Step-100G Next, after a fourth Si-Ge layer 47 is formed on the entire surface by a known method (see FIG. 14), the fourth Si-Ge layer on the first region 31, the second region 32, and the third region 33 is formed. 47 is removed in a known manner. Thus, the structure shown in FIG. 15 can be obtained.
- the first region 31 and the second region 32 have the first Si—Ge layer 41, the first Si layer 42, the second Si—Ge layer 43, the second Si layer 44, and the third Si A stacked structure of a -Ge layer 45 and a third Si layer 46 is formed.
- a first Si-Ge layer 41, a second Si-Ge layer 43, a second Si layer 44, A stacked structure of a third Si layer 46 is formed.
- a first Si layer 42, a second Si layer 44, a third Si—Ge layer 45, and a fourth Si—Ge layer Forty-seven stacked structures are formed.
- Step-110 Thereafter, in order to form the channel structures 11n and 11p, on the third Si layer 46 in the first region 31 and the second region 32, on the third Si layer 46 in the third region 33, and A mask layer 51 made of SiN is formed on the fourth Si—Ge layer 47 in the four regions 34 by a known method (see FIG. 16), and the first region 31 is formed using the mask layer 51 as an etching mask.
- the laminated structure in the second region 32, the third region 33, and the fourth region 34 is etched, and a part of the exposed base 30 in the thickness direction is further etched.
- a groove for forming a shallow trench structure element isolation region 70 is formed in the base 30.
- an insulating material 71 made of SiO 2 is formed on the entire surface, and after smoothing the top surface based on the CMP method, the insulating material 71 is etched and the insulating material 71 is left in the groove, thereby forming a shallow metal.
- An element isolation region 70 having a trench structure can be formed (see FIG. 18). Note that the formation of the element isolation region 70 in the first field-effect transistors 10n and 10p and the formation of the element isolation region 70 in the second field-effect transistors 20n and 20p may be performed simultaneously or separately. .
- Step-120 Next, after the mask layer 51 is removed (see FIGS. 19A, 19B, and 19C and FIGS. 20A, 20B, and 20C), a thermal oxidation process is performed to perform the first oxidation.
- a dummy oxide layer (not shown) is formed on the surface of the stacked structure in the region 31, the second region 32, the third region 33, and the fourth region. Then, a dummy gate portion covering the laminated structure of the first region 31, a dummy gate portion covering the laminated structure of the second region 32, a dummy gate portion covering the laminated structure of the third region 33, and a lamination of the fourth region 34
- a dummy gate portion covering the structure is formed by a known method.
- the dummy gate section is indicated by reference numeral 52.
- the dummy gate section 52 is made of polysilicon.
- the laminated structure in the exposed first region 31, second region 32, third region 33 and fourth region 34 is etched using the dummy gate portion 52 as an etching mask.
- FIGS. 21A, 21B, and 21C and FIGS. 22A, 22B, and 22C can be obtained.
- a similar structure can be provided in the second region 32 and the fourth region 34.
- Step-130 Thereafter, a SiN layer is formed on the entire surface, and the SiN layer is etched back to form a sidewall 53 made of SiN on the side surface of the dummy gate portion 52.
- the sidewalls 53 are not formed at both ends of the channel portions 13n and 13p and at portions corresponding to both ends of the channel forming layers 23n and 23p.
- FIGS. 23A, 23B, and 24C and FIGS. 24A, 24B, and 24C can be obtained.
- a similar structure can be provided in the second region 32 and the fourth region 34.
- Step-140 Thereafter, phosphorus-doped SiC for forming a source / drain region 18n constituting the first field effect transistor 10n and a source / drain region 28n constituting the second field effect transistor 20n from the exposed surface of the base 30.
- the layer 54n is epitaxially grown according to a known method, and is then patterned according to a known method, so that the source / drain region 18n forming the first field effect transistor 10n and the source / drain region forming the second field effect transistor 20n are formed.
- / Drain region 28n can be obtained.
- boron-doped for forming the source / drain region 18p constituting the first field-effect transistor 10p and the source / drain region 28p constituting the second field-effect transistor 20p are formed by epitaxially growing the Si-Ge layer 54p of the first field-effect transistor 10p and then patterning the same by a known method. Can be obtained.
- FIGS. 25A, 25B, and 26C and FIGS. 26A, 26B, and 26C can be obtained.
- a similar structure can be provided in the second region 32 and the fourth region 34.
- a part of the source / drain region 18n is in contact with the side surface of the stacked structure, and the rest is in contact with the sidewall 53.
- a part of the source / drain region 18p is in contact with the side surface of the stacked structure, and the rest is in contact with the sidewall.
- the portion is in contact with the side surface of the stacked structure, the remaining portion is in contact with the sidewall 53, and in the fourth region 34, a part of the source / drain region 28p is in contact with the side surface of the stacked structure, and the remaining portion is the side wall. Is in contact with
- the dummy gate section 52 is removed by a known method [see FIGS. 27A, 27B, and 27C and FIGS. 28A, 28B, and 28C]. Unused dummy oxide layers are removed by a known method. Then, the third Si—Ge layer 45, the second Si—Ge layer 43, and the first Si—Ge layer 41 in the stacked structure of the first region 31 are selectively removed, and the stacked structure of the third region 33 is formed. Then, the second Si—Ge layer 43 and the first Si—Ge layer 41 are selectively removed.
- FIGS. 29 (A), (B) and (C), FIGS. 30 (A), (B) and (C), FIG. 31 (A), (B) and (C) and FIG. The structures shown in (A), (B) and (C) can be obtained.
- the outer periphery of the first Si-Ge layer 43 and the first Si-Ge layer 41 is thermally oxidized to form an oxide film.
- the thermal oxidation treatment By performing the thermal oxidation treatment, the cross-sectional shapes of the nanowire structures 12n and 12p of the first field-effect transistors 10n and 10p having the nanowire structure become circular. These oxide films are not shown.
- FIGS. 33A, 33B, and 34C and FIGS. 34A, 34B, and 34C can be obtained.
- a similar structure can be provided in the second region 32 and the fourth region 34.
- Step-170A Then, based on the atomic layer deposition method (ALD method), a gate insulating film 15 1 (consisting of SiO 2 ) constituting a lower layer of the gate insulating film 14 is formed on the formed oxide film, and at the same time, Then, a gate insulating layer 25 1 (made of SiO 2 ) constituting a lower layer of the gate insulating layer 24 is formed on the formed oxide film.
- FIGS. 35A, 35B, and 35C and FIGS. 36A, 36B, and 36C can be obtained.
- a similar structure can be provided in the second region 32 and the fourth region 34. Note that an insulating film similar to the gate insulating film or an insulating layer similar to the gate insulating layer is deposited also on the side surface 53A inside the sidewall 53, but these are not illustrated in principle in the drawings.
- Step-170B Thereafter, the gate insulating film 15 1 and the lower layer 15 ′ of the first insulating layer in the first field-effect transistors 10n and 10p are removed by a known method. Then, a gate insulating film 15 2 (made of SiO 2 ) constituting a lower layer of the gate insulating film 14 is formed again on the formed oxide film based on the ALD method, and the gate insulating layer 25 1 is formed. A gate insulating layer 25 2 (consisting of SiO 2 ) constituting a lower layer of the gate insulating layer 24 is formed thereon.
- the first field effect transistor 10n, the gate insulating film in 10p is composed of the gate insulating film 15 2.
- the second field effect transistor 20n, the gate insulating layer in 20p is composed of a laminated structure of the gate insulating layer 25 1 and the gate insulating layer 25 2.
- the lower layer 25 ′ of the second insulating layer (the lower layers 25 ′ 1 and 25 ′ 2 of the second insulating layer) thicker than the lower layer 15 ′ of the first insulating layer can be formed on the surface of the base 30. but lower 15 of the first insulating layer 'is to be formed simultaneously with the gate insulating film 15 2, the lower layer 25 of the second insulating layer' is formed simultaneously with the gate insulating layer 25 1 and the gate insulating layer 25 2 .
- FIGS. 37A, 37B, and 38C and FIGS. 38A, 38B, and 38C can be obtained.
- a similar structure can be provided in the second region 32 and the fourth region 34.
- the first field effect transistor 10n without forming a gate insulating film 15 2 to 10p, the second field effect transistor 20n, may be formed of the gate insulating layer 25 2 to 20p.
- the first field effect transistor 10n, the gate insulating film in 10p is composed of the gate insulating film 15 1.
- the second field effect transistor 20n, the gate insulating layer in 20p is composed of a laminated structure of the gate insulating layer 25 1 and the gate insulating layer 25 2.
- the lower layer 25 'of the second insulating layer which is thicker than the lower layer 15' of the first insulating layer can be formed on the surface of the base 30, but the lower layer 15 'of the first insulating layer is insulating film 15 1 at the same time to be formed, the lower layer of the second insulating layer 25 'is formed simultaneously with the gate insulating layer 25 1 and the gate insulating layer 25 2.
- the formation of the gate insulating film 15 in the first field-effect transistors 10n and 10p and the formation of the gate insulating layer 25 in the second field-effect transistors 20n and 20p may be performed separately.
- the gate insulating films in the first field-effect transistors 10n and 10p are formed of the gate insulating film 15.
- the gate insulating layers of the second field-effect transistors 20n and 20p are composed of the gate insulating layer 25.
- the lower layer 25 'of the second insulating layer which is thicker than the lower layer 15' of the first insulating layer can be formed on the surface of the base 30, but the lower layer 15 'of the first insulating layer is It is formed simultaneously with the insulating film 15, and the lower layer 25 ′ of the second insulating layer is formed simultaneously with the gate insulating layer 25.
- the gate insulating film 15 forming the first field effect transistors 10n and 10p is formed by one of the first and second ALD methods, and the gate insulating layer 25 forming the second field effect transistors 20n and 20p is , Formed by the first and second ALD methods.
- the second round of the ALD method by controlling the thickness of each of the SiO 2 film or SiO 2 layer formed SiO 2 film or the thickness of the SiO 2 layer formed by the first round of the ALD method, the second round of the ALD method
- the gate insulating film 15 and the gate insulating layer 25 having a desired thickness can be obtained.
- a single-layer gate insulating film 15 is formed on the first field-effect transistors 10n and 10p, and a plurality of gate insulating layers 25 are formed on the second field-effect transistors 20n and 20p.
- the formation of the gate insulating film 15 in the effect transistors 10n and 10p and the formation of the gate insulating layer 25 in the second field effect transistors 20n and 20p are performed separately, so that the gate insulating film 15 having a desired thickness can be formed. Layer 25 can also be obtained.
- Step-170C Then, on the gate insulating film 15 2 and the gate insulating layer 25 2, the gate insulating film 16 and the gate insulating layer 26 constituting the upper layer of the gate insulating film 14 and the gate insulating layer 24 is formed on the basis of the ALD method.
- the gate insulating film 16 and the gate insulating layer 26 are made of HfO 2 .
- the upper layer 16 ′ of the first insulating layer and the upper layer 26 ′ of the second insulating layer can be formed on the surface of the base 30.
- FIGS. 39A, 39B, and 40C and FIGS. 40A, 40B, and 40C can be obtained.
- a similar structure can be provided in the second region 32 and the fourth region 34.
- gate electrodes 17n, 17p, 27n, 27p made of TiN are formed in a region inside the sidewall 53 by a known method.
- the structures shown in FIGS. 41A, 41B, and 41C and FIGS. 42A, 42B, and 42C can be obtained.
- a similar structure can be provided in the second region 32 and the fourth region 34.
- conductive material layers 19 and 29 made of tungsten (W) are formed on the gate electrodes 17n, 17p, 27n and 27p by a known method. In this manner, a structure whose schematic partial cross-sectional views are shown in FIGS. 1, 2A, and 2B can be obtained.
- the nanowire structure since satisfying T 2 ⁇ (L 1/2 ), and a second field effect transistor having a relatively thick gate insulating film with respect to the first field effect transistor, the nanowire structure It is possible to provide a semiconductor device in which the first field-effect transistor having the same function as the first field-effect transistor is provided. Further, resistance of the channel forming layer of the second field effect transistor, an increase in the transconductance g m, it is possible to reduce the parasitic capacity. The parasitic resistance can be further reduced by further increasing the width of the channel forming layers 23n and 23p of the second field-effect transistors 20n and 20p.
- the thick gate insulating layer 25 is formed on the second field-effect transistors 20n and 20p in the above [Step-170A], and the gate insulating layer 25 is formed in the above [Step-170C].
- the gate insulating layer 26 is formed between the layer 25 and the surface of the base 30, that is, if the gate insulating layer 24 is embedded between the channel forming layers 23 n and 23 p and the surface of the base 30, a schematic part As shown in the sectional view of FIG. 4, a structure is obtained in which the gate electrodes (third gate electrodes) 17n and 17p constituting the second field-effect transistors 20n and 20p cover the top surface and side surfaces of the gate insulating layer 24. be able to.
- the first region 31 and the second region 32 include a first Si-Ge layer 41, a first Si layer 42, a second Si-Ge layer 43, a second Si layer 44, and a third Si-Ge A stacked structure of a layer 45 and a third Si layer 46 is formed, In the third region 33, a stacked structure of the first Si-Ge layer 41 (or the second Si-Ge layer 43), the second Si layer 44, and the third Si layer 46 is formed.
- the fourth region 34 may have a structure in which a laminated structure of the first Si layer 42 (or the first Si layer 44), the third Si—Ge layer 45, and the fourth Si—Ge layer 47 is formed. Good.
- the first region 31 and the second region 32 include a first Si-Ge layer 41, a first Si layer 42, a second Si-Ge layer 43, a second Si layer 44, and a third Si-Ge A stacked structure of a layer 45 and a third Si layer 46 is formed,
- a laminated structure of the first Si—Ge layer 41 (or the second Si—Ge layer 43) and the second Si layer 44 (or the third Si layer 46) is formed.
- a structure in which a laminated structure of the first Si layer 42 (or the first Si layer 44) and the third Si-Ge layer 45 (or the fourth Si-Ge layer 47) is formed. It may be.
- distance L 2 from 2 or the substrate surface to the channel forming layer of the second field effect transistor is different, it is possible to obtain the same structure as that described in example 1.
- the channel forming layers 23n and 23p of the second field-effect transistors 20n and 20p may be made of, for example, silicon (Si). What is necessary is just to make the material which comprises the gate electrodes 27n and 27p different. Specifically, as a material forming the gate electrode 27n, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W, and a compound containing these metals can be given, and the gate electrode 27p is formed. Examples of the material include Fe, Co, Ni, Cu, Ru, Rh, Pd, Ag, Os, Ir, Pt, Au, and compounds containing these metals.
- FIG. 5 is a schematic partial cross-sectional view of a modification (Modification 4) of the semiconductor device of the first embodiment.
- Example 2 relates to the semiconductor device according to the second embodiment of the present disclosure.
- FIG. 6 shows a schematic partial cross-sectional view of the semiconductor device of the second embodiment.
- FIG. 6 is a schematic partial cross-sectional view similar to that taken along arrow AA in FIG. 3A and arrow BB in FIG. 3B.
- FIG. 6 is a schematic partial cross-sectional view of one channel structure in an n-channel first field-effect transistor, and a schematic part of one channel structure in a p-channel first field-effect transistor.
- FIG. 2 shows a cross-sectional view and a schematic partial cross-sectional view of an n-channel second field-effect transistor and a p-channel second field-effect transistor.
- FIG. 6 is a sectional view, but hatching lines are omitted.
- the semiconductor device of the second embodiment is Base 30, At least one of channel portions 13n, 13p having a nanowire structure or a nanosheet structure (in the illustrated example, having nanowire structures 12n, 12p), a gate insulating film 14 surrounding the channel portions 13n, 13p, and a gate insulating film 14
- First field-effect transistor in which at least two (in the illustrated example, three in the direction in which the channel structures 11n and 11p are stacked) at least two channel structures 11n and 11p provided with gate electrodes 17n and 17p surrounding the first field-effect transistor 10n, 10p, and
- a second field-effect transistor 20n, 20p comprising a gate electrode 27n, 27p (formed on the top and side surfaces of Has,
- the channel portions 13n and 13p of the first field-effect transistors 10n and 10p are spaced apart from each other in the stacking direction of the channel structure portions 11n and 11p.
- An insulating material layer 64 is formed between the bottom surfaces of the channel forming layers 23n and 23p constituting the second field effect transistors 20n and 20p and the surface of the base 30.
- a back bias can be applied to the portion of the base 30 facing the bottom surfaces of the channel forming layers 23n and 23p via the insulating material layer 64.
- an n-type or p-type well is formed in this portion of the base 30 by, for example, an ion implantation method in the base 30 made of a silicon semiconductor substrate, and a wiring (not shown) capable of applying a voltage to the well is provided.
- a back bias can be applied to the first field-effect transistors 10n and 10p and the second field-effect transistors 20n and 20p.
- the thickness of the channel portion is T 1-CH and the thickness of the insulating material layer is T Ins , 0.2 ⁇ T 1-CH / T Ins ⁇ 2 To be satisfied.
- T 1-CH / T Ins 8 nm / 8 nm
- the present invention is not limited to such a value.
- FIG. 43 which is a schematic partial sectional view similar to the arrows AA in FIG. 3A and the arrows BB in FIG. 3B, and the arrow BB in FIG. 3B in the second field-effect transistor.
- a in each drawing also refer to arrow AA in (C) of FIG. 20), and similar to those along arrow B′-B ′ in FIG. 3B.
- 44, FIG. 45, FIG. 46, FIG. 47, FIG. 48, FIG. 49, and FIG. 50 in which the first field-effect transistor described in the first embodiment is described. 25 FIG.
- FIGS. 44, 45, 46, 47, 48, 49, and 50 hatching lines are omitted in the first Si—Ge layer 41 and the first Si layer 42. ing.
- a first Si—Ge layer 41 is formed on the first region 31, the second region 32, the third region 33, and the fourth region 34 of the base 30 by a known method.
- a first Si layer 42 is formed on the entire surface by a known method.
- Step-200C Next, after a second Si-Ge layer 43 is formed on the entire surface by a known method, the second Si-layer 43 on the third region 33 and the fourth region 34 is removed by a known method.
- Step-200D Next, after a second Si layer 44 is formed on the entire surface by a known method, the second Si layer 44 on the third region 33 and the fourth region 34 is removed by a known method.
- Step-200E Next, after a third Si-Ge layer 45 is formed on the entire surface by a known method, the third Si-Ge layer 45 on the third region 33 and the fourth region 34 is removed by a known method.
- Step-200F Next, after forming a third Si layer 46 on the entire surface by a known method, the third Si layer 46 on the third region 33 and the fourth region 34 is removed by a known method. Thus, the structure shown in FIG. 43 can be obtained.
- the first region 31 and the second region 32 have the first Si—Ge layer 41, the first Si layer 42, the second Si—Ge layer 43, the second Si layer 44, and the third Si
- a stacked structure of a Ge layer 45 and a third Si layer 46 is formed, and a stacked structure of a first Si—Ge layer 41 and a first Si layer 42 is formed in the third region 33 and the fourth region 34. Is done.
- the first Si layer 46 of the third region 33 and the fourth Si region 42 of the fourth region 34 are formed on the third Si layer 46 of the first region 31 and the second region 32.
- a mask layer 51 made of SiN is formed by a well-known method, and using this mask layer 51 as an etching mask, the laminated structure in the first region 31, the second region 32, the third region 33, and the fourth region 34 is formed. Etching is performed, and a part of the exposed substrate 30 in the thickness direction is etched. A groove for forming a shallow trench structure element isolation region 70 is formed in the base 30.
- an insulating material 71 made of SiO 2 is formed on the entire surface, and after smoothing the top surface based on the CMP method, the insulating material 71 is etched and the insulating material 71 is left in the groove, thereby forming a shallow metal.
- the element isolation region 70 having a trench structure can be formed. Note that the formation of the element isolation region 70 in the first field-effect transistors 10n and 10p and the formation of the element isolation region 70 in the second field-effect transistors 20n and 20p may be performed simultaneously or separately. .
- Step-220 Next, after removing the mask layer 51, a thermal oxidation process is performed to form a dummy oxide layer (not shown) on the surface of the stacked structure in the first region 31, the second region 32, the third region 33, and the fourth region 34. . Then, a dummy gate portion covering the laminated structure of the first region 31, a dummy gate portion covering the laminated structure of the second region 32, a dummy gate portion covering the laminated structure of the third region 33, and a lamination of the fourth region 34 A dummy gate portion covering the structure is formed by a known method. The dummy gate section is indicated by reference numeral 52. The dummy gate section 52 is made of polysilicon. Next, the laminated structure in the exposed first region 31, second region 32, third region 33 and fourth region 34 is etched using the dummy gate portion 52 as an etching mask.
- Step-230 Thereafter, a SiN layer is formed on the entire surface, and the SiN layer is etched back to form a sidewall 53 made of SiN on the side surface of the dummy gate portion 52.
- the sidewalls 53 are not formed at both ends of the channel portions 13n and 13p and at portions corresponding to both ends of the channel forming layers 23n and 23p. In this manner, the structures shown in FIGS. 23A, 23B, and 23C and FIGS. 44A, 44B, and 44C can be obtained.
- Step-240 Thereafter, phosphorus-doped SiC for forming a source / drain region 18n constituting the first field effect transistor 10n and a source / drain region 28n constituting the second field effect transistor 20n from the exposed surface of the base 30.
- the layer 54n is epitaxially grown according to a known method, and is then patterned according to a known method, so that the source / drain region 18n forming the first field effect transistor 10n and the source / drain region forming the second field effect transistor 20n are formed.
- / Drain region 28n can be obtained.
- boron-doped for forming the source / drain region 18p constituting the first field-effect transistor 10p and the source / drain region 28p constituting the second field-effect transistor 20p are formed by epitaxially growing the Si-Ge layer 54p of the first field-effect transistor 10p and then patterning the same by a known method. Can be obtained.
- FIGS. 25A, 25B, and C and FIGS. 45A, 45B, and 45C can be obtained.
- a similar structure can be provided in the second region 32 and the fourth region 34.
- a part of the source / drain region 18n is in contact with the side surface of the stacked structure, and the rest is in contact with the sidewall 53.
- a part of the source / drain region 18p is in contact with the side surface of the stacked structure, and the rest is in contact with the sidewall.
- the portion is in contact with the side surface of the stacked structure, the remaining portion is in contact with the sidewall 53, and in the fourth region 34, a part of the source / drain region 28p is in contact with the side surface of the stacked structure, and the remaining portion is the side wall. Is in contact with
- Step-250 Thereafter, the dummy gate portions 52 in the third region 33 and the fourth region 34 are removed by a known method (see FIGS. 46A, 46B and 46C). The dummy gate portions 52 of the first region 31 and the second region 32 are left. Then, after removing the dummy oxide layer (not shown) in the third region 33 and the fourth region 34 by a known method, the first Si—Ge layer 41 in the stacked structure of the third region 33 and the fourth region 34 is selectively removed. (See FIGS. 47 (A), (B) and (C)).
- an insulating material layer 64 is formed on the entire surface, and then an etch-back is performed, so that an insulating material layer is formed between the first Si layer 42 and the surface of the base 30 in the laminated structure of the third region 33 and the fourth region 34.
- Layer 64 can be formed.
- the insulating material layer 64 extends above the surface of the base 30 from portions of the third region 33 and the fourth region 34 located below the first Si layer 42.
- Step-260 Next, the dummy gate portions 52 in the first region 31 and the second region 32 are removed by a known method, and a dummy oxide layer (not shown) is removed by a known method. Then, the third Si—Ge layer 45, the second Si—Ge layer 43, and the first Si—Ge layer 41 in the stacked structure of the first region 31 are selectively removed (FIG. 29A, (See (B) and (C)). Further, the third Si layer 46, the second Si layer 44, and the first Si layer 42 in the stacked structure of the second region 32 are selectively removed (FIGS. 31A, 31B, and 31C). )reference).
- the outer periphery of the Ge layer 43 and the first Si—Ge layer 41, the exposed first Si layer 42 in the third region 33, and the exposed first Si layer 42 in the fourth region 34 are thermally oxidized to form an oxide film;
- the cross-sectional shapes of the nanowire structures 12n and 12p of the first field-effect transistors 10n and 10p having the nanowire structure become circular. These oxide films are not shown.
- FIGS. 33A, 33B, and 33C can be obtained.
- a similar structure can be provided.
- Step-270A Then, based on the atomic layer deposition method (ALD method), a gate insulating film 15 1 (consisting of SiO 2 ) constituting a lower layer of the gate insulating film 14 is formed on the formed oxide film, and at the same time, Then, a gate insulating layer 25 1 (made of SiO 2 ) constituting a lower layer of the gate insulating layer 24 is formed on the formed oxide film.
- ALD method atomic layer deposition method
- Step-270B Thereafter, the gate insulating film 15 1 and the lower layer 15 ′ of the first insulating layer in the first field-effect transistors 10n and 10p are removed by a known method. Then, a gate insulating film 15 2 (made of SiO 2 ) constituting a lower layer of the gate insulating film 14 is formed again on the formed oxide film based on the ALD method, and the gate insulating layer 25 1 is formed. A gate insulating layer 25 2 (consisting of SiO 2 ) constituting a lower layer of the gate insulating layer 24 is formed thereon.
- the first field effect transistor 10n, the gate insulating film in 10p is composed of the gate insulating film 15 2.
- the gate insulating layer in 20p is composed of a laminated structure of the gate insulating layer 25 1 and the gate insulating layer 25 2.
- the first lower insulating layer 15 ' is formed simultaneously with the gate insulating film 15 2.
- the first field effect transistor 10n without forming a gate insulating film 15 2 to 10p, the second field effect transistor 20n, may be formed of the gate insulating layer 25 2 to 20p.
- the first field effect transistor 10n, the gate insulating film in 10p is composed of the gate insulating film 15 1.
- the second field effect transistor 20n, the gate insulating layer in 20p is composed of a laminated structure of the gate insulating layer 25 1 and the gate insulating layer 25 2.
- the lower layer 15 of the first insulating layer ' is formed simultaneously with the gate insulating film 15 1.
- the formation of the gate insulating film 15 in the first field-effect transistors 10n and 10p and the formation of the gate insulating layer 25 in the second field-effect transistors 20n and 20p may be performed separately.
- the gate insulating films in the first field-effect transistors 10n and 10p are formed of the gate insulating film 15.
- the gate insulating layers of the second field-effect transistors 20n and 20p are composed of the gate insulating layer 25.
- the lower layer 15 'of the first insulating layer is formed simultaneously with the gate insulating film 15.
- the gate insulating film 15 forming the first field effect transistors 10n and 10p is formed by one of the first and second ALD methods, and the gate insulating layer 25 forming the second field effect transistors 20n and 20p is , Formed by the first and second ALD methods.
- the second round of the ALD method by controlling the thickness of each of the SiO 2 film or SiO 2 layer formed SiO 2 film or the thickness of the SiO 2 layer formed by the first round of the ALD method, the second round of the ALD method
- the gate insulating film 15 and the gate insulating layer 25 having a desired thickness can be obtained.
- a single-layer gate insulating film 15 is formed on the first field-effect transistors 10n and 10p, and a plurality of gate insulating layers 25 are formed on the second field-effect transistors 20n and 20p.
- the formation of the gate insulating film 15 in the effect transistors 10n and 10p and the formation of the gate insulating layer 25 in the second field effect transistors 20n and 20p are performed separately, so that the gate insulating film 15 having a desired thickness can be formed. Layer 25 can also be obtained.
- Step-270C Then, on the gate insulating film 15 2 and the gate insulating layer 25 2, the gate insulating film 16 and the gate insulating layer 26 constituting the upper layer of the gate insulating film 14 and the gate insulating layer 24 is formed on the basis of the ALD method.
- the gate insulating film 16 and the gate insulating layer 26 are made of HfO 2 .
- the upper layer 16 ′ of the first insulating layer can be formed on the surface of the base 30.
- FIGS. 39A, 39B, and 39C and FIGS. 49A, 49B, and 49C can be obtained.
- a similar structure can be provided in the second region 32 and the fourth region 34.
- An insulating layer having the same laminated structure as the first insulating layer 14 'and the second insulating layer 24' is also formed on the side surface of the side wall 53, but is not shown in drawings other than FIG.
- gate electrodes 17n, 17p, 27n, 27p made of TiN are formed in a region inside the sidewall 53 by a known method.
- the structures shown in FIGS. 41A, 41B, and 50C and FIGS. 50A, 50B, and 50C can be obtained.
- a similar structure can be provided in the second region 32 and the fourth region 34.
- conductive material layers 19 and 29 made of tungsten (W) are formed on the gate electrodes 17n, 17p, 27n and 27p by a known method. In this way, the structure shown in the schematic partial cross-sectional view in FIG. 6 can be obtained.
- the gate electrode forming the second field effect transistor is formed at least on the top surface of the channel formation layer, and the bottom surface of the channel formation layer forming the second field effect transistor and the substrate Since a thin (for example, the same or similar thickness as the channel portion) insulating material layer is formed between the substrate and the surface, the threshold voltage Vth can be controlled by applying a back bias. It is possible to provide a semiconductor device in which a simple second field-effect transistor and a first field-effect transistor having a nanowire structure or the like coexist.
- At least one semiconductor layer is provided between the channel forming layers 23n and 23p and the insulating material layer 64 as shown in FIG. 7 which is a schematic partial cross-sectional view of the second field effect transistors 20n and 20p.
- 61 may be formed. In the illustrated example, two semiconductor layers 61 are formed. By connecting the semiconductor layer 61 to a wiring layer (not shown) formed below the source / drain regions 28n and 28p, a back bias can be applied to the semiconductor layer 61.
- An interlayer insulating layer 65 is formed between the channel forming layers 23n and 23p and the semiconductor layer 61, and between the semiconductor layer 61 and the semiconductor layer 61.
- Such a structure can be manufactured by the following method. That is, in the third region 33 and the fourth region 34, the first Si—Ge layer 41, the first Si layer 42, the second Si—Ge layer 43, the second Si layer 44, and the third Si— A stacked structure of the Ge layer 45 and the third Si layer 46 is formed, and in the same step as [Step-250], the third Si—Ge layer 45, the second Si—Ge layer 43, and the first Si -The Ge layer 41 is selectively removed. After the insulating material layer 64 is formed on the entire surface, the insulating material is etched back, so that the insulating material between the surface of the first Si layer 42 and the surface of the base 30 in the laminated structure of the third region 33 and the fourth region 34 is formed. The layer 64 is formed, and an interlayer insulating layer 65 can be formed between the semiconductor layers 61.
- the semiconductor layer 61 in the third region 33 has a conductivity type (p-type) opposite to the conductivity type (n-type) of the channel formation layer 23n.
- the layer 61 may have a conductivity type (n-type) opposite to the conductivity type (p-type) of the channel formation layer 23p.
- an appropriate impurity may be introduced into the semiconductor layer 61 based on an ion implantation method, and the semiconductor layer 61 may be ion-implanted at a time. The formation and the ion implantation may be repeated by the number of semiconductor layers.
- the first region 31 and the second region 32 include a first Si-Ge layer 41, a first Si layer 42, a second Si-Ge layer 43, a second Si layer 44, and a third Si-Ge A stacked structure of a layer 45 and a third Si layer 46 is formed,
- the third region 33 and the fourth region may have a structure in which a stacked structure of two or more Si—Ge layers or Si layers is formed.
- the present disclosure has been described based on the preferred embodiments.
- the configuration, the structure, the material forming the semiconductor device, and the method of manufacturing the semiconductor device of the semiconductor device described in the embodiments are merely examples, and can be appropriately changed.
- the order of the steps in the method of manufacturing a semiconductor device in each embodiment can be appropriately changed as desired.
- the channel structure has been described based exclusively on the nanowire structure.
- the channel structure may be a nanosheet structure.
- an SOI substrate can be used instead of the silicon semiconductor substrate.
- an element isolation region may be formed in the first step of the method for manufacturing a semiconductor device.
- the laminated structure includes a first Si-Ge layer 41, a first Si layer 42, a second Si-Ge layer 43, a second Si layer 44, a third Si-Ge layer 45, although the third Si layer 46 and the fourth Si—Ge layer 47 are used, the first Si layer 42, the first Si—Ge layer 41, the second Si layer 44, and the second It can also be composed of the Si-Ge layer 43, the third Si layer 46, the third Si-Ge layer 45, and the fourth Si layer 47. Further, the number of stacked channel structure portions may be two or more.
- the SiGe layer can also be obtained by forming an upper SiGe layer on a lower Si layer and performing an oxidation process, whereby the upper SiGe layer becomes SiO 2 and the lower Si layer becomes a SiGe layer. .
- the present disclosure may have the following configurations.
- First Embodiment >> Substrate, A first electric field in which at least two channel structures each including a channel portion having a nanowire structure or a nanosheet structure, a gate insulating film surrounding the channel portion, and a gate electrode surrounding at least a part of the gate insulating film are stacked.
- a second field-effect transistor including a channel forming layer, a gate insulating layer surrounding the channel forming layer, and a gate electrode surrounding at least a part of the gate insulating layer;
- the first field-effect transistor and the second field-effect transistor are formed above the base, The channel portions of the first field-effect transistor are spaced apart from each other in the stacking direction of the channel structure portion,
- T 2 ⁇ (L 1/2 ) Semiconductor device that satisfies [A02] T 2 ⁇ 1.1 ⁇ (L 1/2)
- T 2 ⁇ 1.2 ⁇ (L 1 /2) [A01]
- the second field-effect transistor includes an n-channel field-effect transistor and a p-channel field-effect transistor,
- the channel formation layer of the n-channel type field effect transistor is made of silicon
- the first field-effect transistor is composed of an n-channel field-effect transistor and a p-channel field-effect transistor,
- the channel portion of the n-channel field effect transistor is made of silicon
- a second field effect transistor including a channel forming layer, a gate insulating layer formed on the top surface and side surfaces of the channel forming layer, and a gate electrode formed on at least the top surface of the gate insulating layer; Has, The first field-effect transistor and the second field-effect transistor are formed above the base, The channel portions of the first field-effect transistor are spaced apart from each other in the stacking direction of the channel structure portion, A semiconductor device in which an insulating material layer is formed between a bottom surface of a channel formation layer constituting a second field-effect transistor and a surface of a base.
- [B02] The semiconductor device according to [B01], wherein a back bias is applied to a portion of the base facing the bottom surface of the channel formation layer via the insulating material layer.
- a back bias is applied to a portion of the base facing the bottom surface of the channel formation layer via the insulating material layer.
- the thickness of the channel portion is T 1-CH and the thickness of the insulating material layer is T Ins , 0.2 ⁇ T 1-CH / T Ins ⁇ 2
- the semiconductor device according to [B01] or [B02] which satisfies the following.
- [B04] The semiconductor according to any one of [B01] to [B03], wherein in the second field-effect transistor, at least one semiconductor layer is formed between the channel formation layer and the insulating material layer. apparatus.
- 10n, 10p first field-effect transistor, 11n, 11p: channel structure, 12n, 12p: nanowire structure, 13n, 13p: channel, 14: gate insulating film, 14 '... first insulating layer, 15, 15 1 , 15 2 ... part of gate insulating film (lower layer of gate insulating film), 15' ... lower layer of first insulating layer, 16 ... -Remaining gate insulating film (upper layer of gate insulating film), 16 '... upper layer of first insulating layer, 17n, 17p ... gate electrode, 18n, 18p ... source / drain region, 19 ... -Conductive material layer, 20n, 20p ... second field effect transistor, 23n, 23p ... channel formation layer, 24 ...
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- Metal-Oxide And Bipolar Metal-Oxide Semiconductor Integrated Circuits (AREA)
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Abstract
Description
基体、
ナノワイヤー構造又はナノシート構造を有するチャネル部、チャネル部を取り囲むゲート絶縁膜、及び、ゲート絶縁膜の少なくとも一部を取り囲むゲート電極を備えたチャネル構造部が、少なくとも2つ、積層された第1電界効果トランジスタ、並びに、
チャネル形成層、チャネル形成層を取り囲むゲート絶縁層、及び、ゲート絶縁層の少なくとも一部を取り囲むゲート電極から成る第2電界効果トランジスタ、
を具備しており、
第1電界効果トランジスタ及び第2電界効果トランジスタは、基体の上方に形成されており、
第1電界効果トランジスタのチャネル部は、チャネル構造部の積層方向において、相互に離間して配置されており、
第1電界効果トランジスタのチャネル部とチャネル部との間の距離をL1、第2電界効果トランジスタのゲート絶縁層の厚さをT2としたとき、
T2≧(L1/2)
好ましくは、
T2≧1.1×(L1/2)
より好ましくは、
T2≧1.2×(L1/2)
を満足する。
基体、
ナノワイヤー構造又はナノシート構造を有するチャネル部、チャネル部を取り囲むゲート絶縁膜、及び、ゲート絶縁膜の少なくとも一部を取り囲むゲート電極を備えたチャネル構造部が、少なくとも2つ、積層された第1電界効果トランジスタ、並びに、
チャネル形成層、チャネル形成層の頂面及び側面に形成されたゲート絶縁層、及び、ゲート絶縁層の少なくとも頂面に形成されたゲート電極から成る第2電界効果トランジスタ、
第1電界効果トランジスタ及び第2電界効果トランジスタは、基体の上方に形成されており、
第1電界効果トランジスタのチャネル部は、チャネル構造部の積層方向において、相互に離間して配置されており、
第2電界効果トランジスタを構成するチャネル形成層の底面と基体表面との間には絶縁材料層が形成されている。
1.本開示の第1の態様~第2の態様に係る半導体装置、全般に関する説明
2.実施例1(本開示の第1の態様に係る半導体装置)
3.実施例2(本開示の第2の態様に係る半導体装置)
4.その他
本開示の第1の態様に係る半導体装置にあっては、基体表面から第2電界効果トランジスタのチャネル形成層までの距離をL2としたとき、
L2≧L1
L2≧T2
を満足する形態とすることができ、この場合、更には、好ましくは、
L2≧2×L1
を満足する形態とすることができる。
T2≧2×T1
好ましくは、
T2≧3×T1
を満足する形態とすることができる。このような形態とすることで、第1電界効果トランジスタに対して相対的に厚いゲート絶縁膜を有する第2電界効果トランジスタを、確実に得ることができる。
T2-CH≧2×T1-CH
好ましくは、
T2-CH≧3×T1-CH
を満足する形態とすることができる。このような形態とすることで、第2電界効果トランジスタのチャネル形成層の低抵抗化、相互コンダクタンスgmの増加、低寄生容量化を図ることができる。
第2電界効果トランジスタは、nチャネル型電界効果トランジスタ及びpチャネル型電界効果トランジスタから構成されており、
nチャネル型電界効果トランジスタのチャネル形成層は、シリコン(Si)から成り、
pチャネル型電界効果トランジスタのチャネル形成層は、シリコン(Si)又はシリコン-ゲルマニウム(SiGe)から成る形態とすることができる。
第1電界効果トランジスタは、nチャネル型電界効果トランジスタ及びpチャネル型電界効果トランジスタから構成されており、
nチャネル型電界効果トランジスタのチャネル部は、シリコン(Si)から成り、
pチャネル型電界効果トランジスタのチャネル部は、シリコン-ゲルマニウム(SiGe)、ゲルマニウム(Ge)又はInGaAsから成る形態とすることができる。
nチャネル型電界効果トランジスタのチャネル部は、シリコン-ゲルマニウム(SiGe)から成り、
pチャネル型電界効果トランジスタのチャネル部は、シリコン(Si)、ゲルマニウム(Ge)又はInGaAsから成る形態とすることができるし、
nチャネル型電界効果トランジスタのチャネル部は、ゲルマニウム(Ge)から成り、
pチャネル型電界効果トランジスタのチャネル部は、シリコン(Si)、シリコン-ゲルマニウム(SiGe)又はInGaAsから成る形態とすることができるし、
nチャネル型電界効果トランジスタのチャネル部は、InGaAsから成り、
pチャネル型電界効果トランジスタのチャネル部は、シリコン(Si)、シリコン-ゲルマニウム(SiGe)又はゲルマニウム(Ge)から成る形態とすることができる。
0.2≦T1-CH/TIns≦2
好ましくは、
0.5≦T1-CH/TIns≦1
を満足する構成とすることができる。
基体30、
ナノワイヤー構造又はナノシート構造を有する(図示した例では、ナノワイヤー構造12n,12pを有する)チャネル部13n,13p、チャネル部13n,13pを取り囲むゲート絶縁膜14、及び、ゲート絶縁膜14の少なくとも一部を取り囲むゲート電極17n,17pを備えたチャネル構造部11n,11pが、少なくとも2つ(図示した例では、チャネル構造部11n,11pの積層方向に3つ)、積層された第1電界効果トランジスタ10n,10p、並びに、
チャネル形成層23n,23p、チャネル形成層23n,23pを取り囲むゲート絶縁層24、及び、ゲート絶縁層24の少なくとも一部を取り囲む(図示した例では、ゲート絶縁層24を取り囲む)ゲート電極27n,27pから成る第2電界効果トランジスタ20n,20p、
を具備しており、
第1電界効果トランジスタ10n,10p及び第2電界効果トランジスタ20n,20pは、基体30の上方に形成されており、
第1電界効果トランジスタ10n,10pのチャネル部13n,13pは、チャネル構造部11n,11pの積層方向において、相互に離間して配置されている。
T2≧(L1/2)
好ましくは、
T2≧1.1×(L1/2)
より好ましくは、
T2≧1.2×(L1/2)
を満足する。
L2≧L1
L2≧T2
好ましくは、
L2≧2×L1
を満足する。
T2≧2×T1
好ましくは、
T2≧3×T1
を満足するし、チャネル部13n,13pの厚さをT1-CH、チャネル形成層23n,23pの厚さをT2-CHとしたとき、
T2-CH≧2×T1-CH
好ましくは、
T2-CH≧3×T1-CH
を満足する。
T2/(L1/2)=1.5
L2/L1 =2.0
L2/T2 =2.7
T2/T1 =3.0
T2-CH/T1-CH =2.0
としたが、これらの値に限定するものではない。ここで、
T1-CH= 8nm
T2-CH=16nm
T1 =2nm
T2 =6nm
L1 =8nm
L2 =16nm
とした。
T2’/T1’≧3
を挙げることができる。
先ず、基体30の第1領域31、第2領域32、第3領域33及び第4領域34に第1のSi-Ge層41を周知の方法で形成した後(図8A参照)、第4領域34上の第1のSi-Ge層41を周知の方法で除去する。こうして、図8Bに示す構造を得ることができる。
次に、全面に第1のSi層42を周知の方法で形成した後(図8C参照)、第3領域33上の第1のSi層42を周知の方法で除去する。こうして、図9Aに示す構造を得ることができる。
次に、全面に第2のSi-Ge層43を周知の方法で形成した後(図9B参照)、第4領域34上の第2のSi-層43を周知の方法で除去する。こうして、図10Aに示す構造を得ることができる。
次に、全面に第2のSi層44を周知の方法で形成する。こうして、図10Bに示す構造を得ることができる。
次に、全面に第3のSi-Ge層45を周知の方法で形成した後(図11A参照)、第3領域33上の第3のSi-層45を周知の方法で除去する。こうして、図11Bに示す構造を得ることができる。
次に、全面に第3のSi層46を周知の方法で形成した後(図12参照)、第4領域34上の第3のSi層46を周知の方法で除去する。こうして、図13に示す構造を得ることができる。
次に、全面に第4のSi-Ge層47を周知の方法で形成した後(図14参照)、第1領域31、第2領域32及び第3領域33上の第4のSi-Ge層47を周知の方法で除去する。こうして、図15に示す構造を得ることができる。
その後、チャネル構造部11n,11pを形成するために、第1領域31及び第2領域32の第3のSi層46の上、第3領域33の第3のSi層46の上、及び、第4領域34の第4のSi-Ge層47の上に、SiNから成るマスク層51を周知の方法で形成し(図16参照)、このマスク層51をエッチング用マスクとして、第1領域31、第2領域32、第3領域33及び第4領域34における積層構造をエッチングし、更に、露出した基体30の厚さ方向の一部分をエッチングする。こうして、図17に示す構造を得ることができる。基体30にはシャロー・トレンチ構造の素子分離領域70を形成するための溝部が形成される。そして、全面にSiO2から成る絶縁材料71を成膜し、CMP法に基づき頂面の平滑化処理を行った後、絶縁材料71をエッチングし、溝部に絶縁材料71を残すことで、シャロー・トレンチ構造を有する素子分離領域70を形成することができる(図18参照)。尚、第1電界効果トランジスタ10n,10pにおける素子分離領域70の形成と、第2電界効果トランジスタ20n,20pにおける素子分離領域70の形成とを、同時に行ってもよいし、別々に行ってもよい。
次いで、マスク層51を除去した後(図19の(A)、(B)及び(C)並びに図20の(A)、(B)及び(C)参照)、熱酸化処理を行い、第1領域31、第2領域32、第3領域33及び第4領域34における積層構造の表面に、図示しないダミー酸化層を形成する。そして、第1領域31の積層構造を覆うダミー・ゲート部、第2領域32の積層構造を覆うダミー・ゲート部、第3領域33の積層構造を覆うダミー・ゲート部、第4領域34の積層構造を覆うダミー・ゲート部を、周知の方法で形成する。ダミー・ゲート部を参照番号52で示す。ダミー・ゲート部52はポリシリコンから成る。次いで、ダミー・ゲート部52をエッチング用マスクとして、露出した第1領域31、第2領域32、第3領域33及び第4領域34における積層構造をエッチングする。こうして、図21の(A)、(B)及び(C)並びに図22の(A)、(B)及び(C)に示す構造を得ることができる。第2領域32及び第4領域34においても、同様の構造を設けることができる。
その後、全面にSiN層を形成し、このSiN層をエッチバックすることで、ダミー・ゲート部52の側面にSiNから成るサイドウォール53を形成する。但し、チャネル部13n,13pの両端、及び、チャネル形成層23n,23pの両端に相当する部分には、サイドウォール53を形成しない。こうして、図23の(A)、(B)及び(C)並びに図24の(A)、(B)及び(C)に示す構造を得ることができる。第2領域32及び第4領域34においても、同様の構造を設けることができる。
その後、露出した基体30の表面から、第1電界効果トランジスタ10nを構成するソース/ドレイン領域18n、及び、第2電界効果トランジスタ20nを構成するソース/ドレイン領域28nを形成するためのリン・ドープSiC層54nを周知の方法に基づきエピタキシャル成長させ、次いで、周知の方法に基づきパターニングすることで、第1電界効果トランジスタ10nを構成するソース/ドレイン領域18n、及び、第2電界効果トランジスタ20nを構成するソース/ドレイン領域28nを得ることができる。同様に、露出した基体30の表面から、第1電界効果トランジスタ10pを構成するソース/ドレイン領域18p、及び、第2電界効果トランジスタ20pを構成するソース/ドレイン領域28pを形成するためのボロン・ドープのSi-Ge層54pを周知の方法に基づきエピタキシャル成長させ、次いで、周知の方法に基づきパターニングすることで、第1電界効果トランジスタ10pを構成するソース/ドレイン領域18p、及び、第2電界効果トランジスタ20pを構成するソース/ドレイン領域28pを得ることができる。
その後、ダミー・ゲート部52を周知の方法で除去し[図27の(A)、(B)及び(C)並びに図28の(A)、(B)及び(C)参照]、更に、図示しないダミー酸化層を周知の方法で除去する。そして、第1領域31の積層構造における第3のSi-Ge層45、第2のSi-Ge層43及び第1のSi-Ge層41を選択的に除去し、第3領域33の積層構造における第2のSi-Ge層43及び第1のSi-Ge層41を選択的に除去する。また、第2領域32の積層構造における第3のSi層46、第2のSi層44及び第1のSi層42を選択的に除去し、第4領域34の積層構造における第2のSi層44及び第1のSi層42を選択的に除去する。こうして、図29の(A)、(B)及び(C)、図30の(A)、(B)及び(C)、図31の(A)、(B)及び(C)並びに図32の(A)、(B)及び(C)に示す構造を得ることができる。
次に、第1領域31における露出した第3のSi層46、第2のSi層44及び第1のSi層42、第2領域32における露出した第3のSi-Ge層45、第2のSi-Ge層43及び第1のSi-Ge層41、第3領域33における露出した第2のSi層44及び第1のSi層42、第4領域34における露出した第2のSi-Ge層43及び第1のSi-Ge層41の外周を熱酸化し、酸化膜を形成する。熱酸化処理を行うことで、ナノワイヤー構造から成る第1電界効果トランジスタ10n,10pのナノワイヤー構造12n,12pの断面形状は円形となる。尚、これらの酸化膜は図示していない。こうして、図33の(A)、(B)及び(C)並びに図34の(A)、(B)及び(C)に示す構造を得ることができる。第2領域32及び第4領域34においても、同様の構造を設けることができる。
そして、アトミック・レイヤー・デポジッション法(ALD法)に基づき、形成された酸化膜の上にゲート絶縁膜14の下層を構成するゲート絶縁膜151(SiO2から成る)を形成し、併せて、形成された酸化膜の上にゲート絶縁層24の下層を構成するゲート絶縁層251(SiO2から成る)を形成する。こうして、図35の(A)、(B)及び(C)並びに図36の(A)、(B)及び(C)に示す構造を得ることができる。第2領域32及び第4領域34においても、同様の構造を設けることができる。尚、サイドウォール53の内側の側面53Aにもゲート絶縁膜と同様の絶縁膜やゲート絶縁層と同様の絶縁層が堆積するが、図面において、これらの図示は、原則、省略した。
その後、第1電界効果トランジスタ10n,10pにおけるゲート絶縁膜151、第1の絶縁層の下層15’を周知の方法で除去する。そして、再び、ALD法に基づき、形成された酸化膜の上にゲート絶縁膜14の下層を構成するゲート絶縁膜152(SiO2から成る)を形成し、併せて、ゲート絶縁層251の上に、ゲート絶縁層24の下層を構成するゲート絶縁層252(SiO2から成る)を形成する。第1電界効果トランジスタ10n,10pにおけるゲート絶縁膜は、ゲート絶縁膜152から構成されている。一方、第2電界効果トランジスタ20n,20pにおけるゲート絶縁層はゲート絶縁層251及びゲート絶縁層252の積層構造から構成されている。また、第1の絶縁層の下層15’よりも厚い第2の絶縁層の下層25’(第2の絶縁層の下層25’1及び25’2)を基体30の表面に形成することができるが、第1の絶縁層の下層15’はゲート絶縁膜152と同時に形成されるし、第2の絶縁層の下層25’はゲート絶縁層251及びゲート絶縁層252と同時に形成される。こうして、図37の(A)、(B)及び(C)並びに図38の(A)、(B)及び(C)に示す構造を得ることができる。第2領域32及び第4領域34においても、同様の構造を設けることができる。
次いで、ゲート絶縁膜152及びゲート絶縁層252の上に、ゲート絶縁膜14及びゲート絶縁層24の上層を構成するゲート絶縁膜16及びゲート絶縁層26を、ALD法に基づき形成する。ゲート絶縁膜16及びゲート絶縁層26はHfO2から成る。また、第1の絶縁層の上層16’、第2の絶縁層の上層26’を基体30の表面に形成することができる。こうして、図39の(A)、(B)及び(C)並びに図40の(A)、(B)及び(C)に示す構造を得ることができる。第2領域32及び第4領域34においても、同様の構造を設けることができる。
その後、サイドウォール53の内側の領域に、TiNから成るゲート電極17n,17p,27n,27pを周知の方法で形成する。こうして、図41の(A)、(B)及び(C)並びに図42の(A)、(B)及び(C)に示す構造を得ることができる。第2領域32及び第4領域34においても、同様の構造を設けることができる。そして、更に、タングステン(W)から成る導電材料層19,29をゲート電極17n,17p,27n,27pの上に周知の方法で形成する。こうして、図1、図2A、図2Bに模式的な一部断面図を示す構造を得ることができる。
第1領域31及び第2領域32には、第1のSi-Ge層41、第1のSi層42、第2のSi-Ge層43、第2のSi層44、第3のSi-Ge層45及び第3のSi層46の積層構造が形成され、
第3領域33には、第1のSi-Ge層41(あるいは第2のSi-Ge層43)、第2のSi層44及び第3のSi層46の積層構造が形成され、
第4領域34には、第1のSi層42(あるいは第1のSi層44)、第3のSi-Ge層45及び第4のSi-Ge層47の積層構造が形成される構造としてもよい。
第1領域31及び第2領域32には、第1のSi-Ge層41、第1のSi層42、第2のSi-Ge層43、第2のSi層44、第3のSi-Ge層45及び第3のSi層46の積層構造が形成され、
第3領域33には、第1のSi-Ge層41(あるいは第2のSi-Ge層43)及び第2のSi層44(あるいは第3のSi層46)の積層構造が形成され、
第4領域34には、第1のSi層42(あるいは第1のSi層44)及び第3のSi-Ge層45(あるいは第4のSi-Ge層47)の積層構造が形成される構造としてもよい。
基体30、
ナノワイヤー構造又はナノシート構造を有する(図示した例では、ナノワイヤー構造12n,12pを有する)チャネル部13n,13p、チャネル部13n,13pを取り囲むゲート絶縁膜14、及び、ゲート絶縁膜14の少なくとも一部を取り囲むゲート電極17n,17pを備えたチャネル構造部11n,11pが、少なくとも2つ(図示した例では、チャネル構造部11n,11pの積層方向に3つ)、積層された第1電界効果トランジスタ10n,10p、並びに、
チャネル形成層23n,23p、チャネル形成層23n,23pの頂面及び側面に形成されたゲート絶縁層24、及び、ゲート絶縁層24の少なくとも頂面に形成された(図示した例では、ゲート絶縁層24の頂面及び側面に形成された)ゲート電極27n,27pから成る第2電界効果トランジスタ20n,20p、
を具備しており、
第1電界効果トランジスタ10n,10p及び第2電界効果トランジスタ20n,20pは、基体30の上方に形成されており、
第1電界効果トランジスタ10n,10pのチャネル部13n,13pは、チャネル構造部11n,11pの積層方向において、相互に離間して配置されており、
第2電界効果トランジスタ20n,20pを構成するチャネル形成層23n,23pの底面と基体30の表面との間には絶縁材料層64が形成されている。
0.2≦T1-CH/TIns≦2
を満足する。具体的には、
T1-CH/TIns=8nm/8nm
としたが、このような値に限定するものではない。
先ず、基体30の第1領域31、第2領域32、第3領域33及び第4領域34に第1のSi-Ge層41を周知の方法で形成する。
次に、全面に第1のSi層42を周知の方法で形成する。
次に、全面に第2のSi-Ge層43を周知の方法で形成した後、第3領域33及び第4領域34上の第2のSi-層43を周知の方法で除去する。
次に、全面に第2のSi層44を周知の方法で形成した後、第3領域33及び第4領域34上の第2のSi層44を周知の方法で除去する。
次に、全面に第3のSi-Ge層45を周知の方法で形成した後、第3領域33及び第4領域34上の第3のSi-Ge層45を周知の方法で除去する。
次に、全面に第3のSi層46を周知の方法で形成した後、第3領域33及び第4領域34上の第3のSi層46を周知の方法で除去する。こうして、図43に示す構造を得ることができる。
その後、チャネル構造部11n,11pを形成するために、第1領域31及び第2領域32の第3のSi層46の上、第3領域33及び第4領域34の第1のSi層42の上に、SiNから成るマスク層51を周知の方法で形成し、このマスク層51をエッチング用マスクとして、第1領域31、第2領域32、第3領域33及び第4領域34における積層構造をエッチングし、更に、露出した基体30の厚さ方向の一部分をエッチングする。基体30にはシャロー・トレンチ構造の素子分離領域70を形成するための溝部が形成される。そして、全面にSiO2から成る絶縁材料71を成膜し、CMP法に基づき頂面の平滑化処理を行った後、絶縁材料71をエッチングし、溝部に絶縁材料71を残すことで、シャロー・トレンチ構造を有する素子分離領域70を形成することができる。尚、第1電界効果トランジスタ10n,10pにおける素子分離領域70の形成と、第2電界効果トランジスタ20n,20pにおける素子分離領域70の形成とを、同時に行ってもよいし、別々に行ってもよい。
次いで、マスク層51を除去した後、熱酸化処理を行い、第1領域31、第2領域32、第3領域33及び第4領域34における積層構造の表面に、図示しないダミー酸化層を形成する。そして、第1領域31の積層構造を覆うダミー・ゲート部、第2領域32の積層構造を覆うダミー・ゲート部、第3領域33の積層構造を覆うダミー・ゲート部、第4領域34の積層構造を覆うダミー・ゲート部を、周知の方法で形成する。ダミー・ゲート部を参照番号52で示す。ダミー・ゲート部52はポリシリコンから成る。次いで、ダミー・ゲート部52をエッチング用マスクとして、露出した第1領域31、第2領域32、第3領域33及び第4領域34における積層構造をエッチングする。
その後、全面にSiN層を形成し、このSiN層をエッチバックすることで、ダミー・ゲート部52の側面にSiNから成るサイドウォール53を形成する。但し、チャネル部13n,13pの両端、及び、チャネル形成層23n,23pの両端に相当する部分には、サイドウォール53を形成しない。こうして、図23の(A)、(B)及び(C)並びに図44の(A)、(B)及び(C)に示す構造を得ることができる。
その後、露出した基体30の表面から、第1電界効果トランジスタ10nを構成するソース/ドレイン領域18n、及び、第2電界効果トランジスタ20nを構成するソース/ドレイン領域28nを形成するためのリン・ドープSiC層54nを周知の方法に基づきエピタキシャル成長させ、次いで、周知の方法に基づきパターニングすることで、第1電界効果トランジスタ10nを構成するソース/ドレイン領域18n、及び、第2電界効果トランジスタ20nを構成するソース/ドレイン領域28nを得ることができる。同様に、露出した基体30の表面から、第1電界効果トランジスタ10pを構成するソース/ドレイン領域18p、及び、第2電界効果トランジスタ20pを構成するソース/ドレイン領域28pを形成するためのボロン・ドープのSi-Ge層54pを周知の方法に基づきエピタキシャル成長させ、次いで、周知の方法に基づきパターニングすることで、第1電界効果トランジスタ10pを構成するソース/ドレイン領域18p、及び、第2電界効果トランジスタ20pを構成するソース/ドレイン領域28pを得ることができる。
その後、第3領域33及び第4領域34のダミー・ゲート部52を周知の方法で除去する(図46の(A)、(B)及び(C)参照)。第1領域31及び第2領域32のダミー・ゲート部52は残したままとする。そして、第3領域33及び第4領域34における図示しないダミー酸化層を周知の方法で除去した後、第3領域33及び第4領域34の積層構造における第1のSi-Ge層41を選択的に除去する(図47の(A)、(B)及び(C)参照)。その後、全面に絶縁材料層64を形成した後、エッチバックを行うことで、第3領域33及び第4領域34の積層構造における第1のSi層42と基体30の表面の間に、絶縁材料層64を形成することができる。絶縁材料層64は、第3領域33及び第4領域34の第1のSi層42の下に位置する部分から基体30の表面の上を延在している。こうして、図48の(A)、(B)及び(C)に示す構造を得ることができる。
次に、第1領域31及び第2領域32のダミー・ゲート部52を周知の方法で除去し、更に、図示しないダミー酸化層を周知の方法で除去する。そして、第1領域31の積層構造における第3のSi-Ge層45、第2のSi-Ge層43及び第1のSi-Ge層41を選択的に除去する(図29の(A)、(B)及び(C)参照)。また、第2領域32の積層構造における第3のSi層46、第2のSi層44及び第1のSi層42を選択的に除去する(図31の(A)、(B)及び(C)参照)。そして、第1領域31における露出した第3のSi層46、第2のSi層44及び第1のSi層42、第2領域32における露出した第3のSi-Ge層45、第2のSi-Ge層43及び第1のSi-Ge層41、第3領域33における露出した第1のSi層42、第4領域34における露出した第1のSi層42の外周を熱酸化し、酸化膜を形成する。熱酸化処理を行うことで、ナノワイヤー構造から成る第1電界効果トランジスタ10n,10pのナノワイヤー構造12n,12pの断面形状は円形となる。尚、これらの酸化膜は図示していない。こうして、図33の(A)、(B)及び(C)に示す構造を得ることができる。第2領域32においても、同様の構造を設けることができる。
そして、アトミック・レイヤー・デポジッション法(ALD法)に基づき、形成された酸化膜の上にゲート絶縁膜14の下層を構成するゲート絶縁膜151(SiO2から成る)を形成し、併せて、形成された酸化膜の上にゲート絶縁層24の下層を構成するゲート絶縁層251(SiO2から成る)を形成する。こうして、図35の(A)、(B)及び(C)に示す構造を得ることができる。第2領域32においても、同様の構造を設けることができる。
その後、第1電界効果トランジスタ10n,10pにおけるゲート絶縁膜151、第1の絶縁層の下層15’を周知の方法で除去する。そして、再び、ALD法に基づき、形成された酸化膜の上にゲート絶縁膜14の下層を構成するゲート絶縁膜152(SiO2から成る)を形成し、併せて、ゲート絶縁層251の上に、ゲート絶縁層24の下層を構成するゲート絶縁層252(SiO2から成る)を形成する。第1電界効果トランジスタ10n,10pにおけるゲート絶縁膜は、ゲート絶縁膜152から構成されている。一方、第2電界効果トランジスタ20n,20pにおけるゲート絶縁層はゲート絶縁層251及びゲート絶縁層252の積層構造から構成されている。第1の絶縁層の下層15’はゲート絶縁膜152と同時に形成される。こうして、図37の(A)、(B)及び(C)に示す構造を得ることができる。第2領域32においても、同様の構造を設けることができる。
次いで、ゲート絶縁膜152及びゲート絶縁層252の上に、ゲート絶縁膜14及びゲート絶縁層24の上層を構成するゲート絶縁膜16及びゲート絶縁層26を、ALD法に基づき形成する。ゲート絶縁膜16及びゲート絶縁層26はHfO2から成る。また、第1の絶縁層の上層16’を基体30の表面に形成することができる。こうして、図39の(A)、(B)及び(C)並びに図49の(A)、(B)及び(C)に示す構造を得ることができる。第2領域32及び第4領域34においても、同様の構造を設けることができる。
その後、サイドウォール53の内側の領域に、TiNから成るゲート電極17n,17p,27n,27pを周知の方法で形成する。こうして、図41の(A)、(B)及び(C)並びに図50の(A)、(B)及び(C)に示す構造を得ることができる。第2領域32及び第4領域34においても、同様の構造を設けることができる。そして、更に、タングステン(W)から成る導電材料層19,29をゲート電極17n,17p,27n,27pの上に周知の方法で形成する。こうして、図6に模式的な一部断面図を示す構造を得ることができる。
第1領域31及び第2領域32には、第1のSi-Ge層41、第1のSi層42、第2のSi-Ge層43、第2のSi層44、第3のSi-Ge層45及び第3のSi層46の積層構造が形成され、
第3領域33及び第4領域には、2層あるいはそれ以上の層数のSi-Ge層あるいはSi層の積層構造が形成される構造としてもよい。
[A01]《半導体装置:第1の態様》
基体、
ナノワイヤー構造又はナノシート構造を有するチャネル部、チャネル部を取り囲むゲート絶縁膜、及び、ゲート絶縁膜の少なくとも一部を取り囲むゲート電極を備えたチャネル構造部が、少なくとも2つ、積層された第1電界効果トランジスタ、並びに、
チャネル形成層、チャネル形成層を取り囲むゲート絶縁層、及び、ゲート絶縁層の少なくとも一部を取り囲むゲート電極から成る第2電界効果トランジスタ、
を具備しており、
第1電界効果トランジスタ及び第2電界効果トランジスタは、基体の上方に形成されており、
第1電界効果トランジスタのチャネル部は、チャネル構造部の積層方向において、相互に離間して配置されており、
第1電界効果トランジスタのチャネル部とチャネル部との間の距離をL1、第2電界効果トランジスタのゲート絶縁層の厚さをT2としたとき、
T2≧(L1/2)
を満足する半導体装置。
[A02]T2≧1.1×(L1/2)
好ましくは、
T2≧1.2×(L1/2)
を満足する[A01]に記載の半導体装置。
[A03]基体表面から第2電界効果トランジスタのチャネル形成層までの距離をL2としたとき、
L2≧L1
L2≧T2
を満足する[A01]又は[A02]に記載の半導体装置。
[A04]L2≧2×L1
を満足する[A03]に記載の半導体装置。
[A05]第1電界効果トランジスタのゲート絶縁膜の厚さをT1としたとき、
T2≧2×T1
を満足する[A01]乃至[A04]のいずれか1項に記載の半導体装置。
[A06]チャネル部の厚さをT1-CH、チャネル形成層の厚さをT2-CHとしたとき、
T2-CH≧2×T1-CH
を満足する[A01]乃至[A05]のいずれか1項に記載の半導体装置。
[A07]第1電界効果トランジスタを構成する最下層のチャネル部の少なくとも一部分は第1のゲート電極で取り囲まれており、それ以外のチャネル部は第2のゲート電極で取り囲まれている[A01]乃至[A06]のいずれか1項に記載の半導体装置。
[A08]第2電界効果トランジスタは、nチャネル型電界効果トランジスタ及びpチャネル型電界効果トランジスタから構成されており、
nチャネル型電界効果トランジスタのチャネル形成層は、シリコンから成り、
pチャネル型電界効果トランジスタのチャネル形成層は、シリコン又はシリコン-ゲルマニウムから成る[A01]乃至[A07]のいずれか1項に記載の半導体装置。
[A09]第1電界効果トランジスタは、nチャネル型電界効果トランジスタ及びpチャネル型電界効果トランジスタから構成されており、
nチャネル型電界効果トランジスタのチャネル部は、シリコンから成り、
pチャネル型電界効果トランジスタのチャネル部は、シリコン-ゲルマニウム、ゲルマニウム又はInGaAsから成る[A01]乃至[A08]のいずれか1項に記載の半導体装置。
[B01]《半導体装置:第2の態様》
基体、
ナノワイヤー構造又はナノシート構造を有するチャネル部、チャネル部を取り囲むゲート絶縁膜、及び、ゲート絶縁膜の少なくとも一部を取り囲むゲート電極を備えたチャネル構造部が、少なくとも2つ、積層された第1電界効果トランジスタ、並びに、
チャネル形成層、チャネル形成層の頂面及び側面に形成されたゲート絶縁層、及び、ゲート絶縁層の少なくとも頂面に形成されたゲート電極から成る第2電界効果トランジスタ、
を具備しており、
第1電界効果トランジスタ及び第2電界効果トランジスタは、基体の上方に形成されており、
第1電界効果トランジスタのチャネル部は、チャネル構造部の積層方向において、相互に離間して配置されており、
第2電界効果トランジスタを構成するチャネル形成層の底面と基体表面との間には絶縁材料層が形成されている半導体装置。
[B02]チャネル形成層の底面と絶縁材料層を介して対向する基体の部分には、バック・バイアスが加えられる[B01]に記載の半導体装置。
[B03]チャネル部の厚さをT1-CH、絶縁材料層の厚さをTInsとしたとき、
0.2≦T1-CH/TIns≦2
を満足する[B01]又は[B02]に記載の半導体装置。
[B04]第2電界効果トランジスタにおいて、チャネル形成層と絶縁材料層との間には、少なくとも1層の半導体層が形成されている[B01]乃至[B03]のいずれか1項に記載の半導体装置。
[B05]チャネル形成層と半導体層との間、半導体層と半導体層との間には、層間絶縁層が形成されている[B04]に記載の半導体装置。
[B06]半導体層は、チャネル形成層の有する導電型とは反対の導電型を有する[B04]又は[B05]に記載の半導体装置。
Claims (15)
- 基体、
ナノワイヤー構造又はナノシート構造を有するチャネル部、チャネル部を取り囲むゲート絶縁膜、及び、ゲート絶縁膜の少なくとも一部を取り囲むゲート電極を備えたチャネル構造部が、少なくとも2つ、積層された第1電界効果トランジスタ、並びに、
チャネル形成層、チャネル形成層を取り囲むゲート絶縁層、及び、ゲート絶縁層の少なくとも一部を取り囲むゲート電極から成る第2電界効果トランジスタ、
を具備しており、
第1電界効果トランジスタ及び第2電界効果トランジスタは、基体の上方に形成されており、
第1電界効果トランジスタのチャネル部は、チャネル構造部の積層方向において、相互に離間して配置されており、
第1電界効果トランジスタのチャネル部とチャネル部との間の距離をL1、第2電界効果トランジスタのゲート絶縁層の厚さをT2としたとき、
T2≧(L1/2)
を満足する半導体装置。 - T2≧1.1×(L1/2)
を満足する請求項1に記載の半導体装置。 - 基体表面から第2電界効果トランジスタのチャネル形成層までの距離をL2としたとき、
L2≧L1
L2≧T2
を満足する請求項1に記載の半導体装置。 - L2≧2×L1
を満足する請求項3に記載の半導体装置。 - 第1電界効果トランジスタのゲート絶縁膜の厚さをT1としたとき、
T2≧2×T1
を満足する請求項1に記載の半導体装置。 - チャネル部の厚さをT1-CH、チャネル形成層の厚さをT2-CHとしたとき、
T2-CH≧2×T1-CH
を満足する請求項1に記載の半導体装置。 - 第1電界効果トランジスタを構成する最下層のチャネル部の少なくとも一部分は第1のゲート電極で取り囲まれており、それ以外のチャネル部は第2のゲート電極で取り囲まれている請求項1に記載の半導体装置。
- 第2電界効果トランジスタは、nチャネル型電界効果トランジスタ及びpチャネル型電界効果トランジスタから構成されており、
nチャネル型電界効果トランジスタのチャネル形成層は、シリコンから成り、
pチャネル型電界効果トランジスタのチャネル形成層は、シリコン又はシリコン-ゲルマニウムから成る請求項1に記載の半導体装置。 - 第1電界効果トランジスタは、nチャネル型電界効果トランジスタ及びpチャネル型電界効果トランジスタから構成されており、
nチャネル型電界効果トランジスタのチャネル部は、シリコンから成り、
pチャネル型電界効果トランジスタのチャネル部は、シリコン-ゲルマニウム、ゲルマニウム又はInGaAsから成る請求項1に記載の半導体装置。 - 基体、
ナノワイヤー構造又はナノシート構造を有するチャネル部、チャネル部を取り囲むゲート絶縁膜、及び、ゲート絶縁膜の少なくとも一部を取り囲むゲート電極を備えたチャネル構造部が、少なくとも2つ、積層された第1電界効果トランジスタ、並びに、
チャネル形成層、チャネル形成層の頂面及び側面に形成されたゲート絶縁層、及び、ゲート絶縁層の少なくとも頂面に形成されたゲート電極から成る第2電界効果トランジスタ、
を具備しており、
第1電界効果トランジスタ及び第2電界効果トランジスタは、基体の上方に形成されており、
第1電界効果トランジスタのチャネル部は、チャネル構造部の積層方向において、相互に離間して配置されており、
第2電界効果トランジスタを構成するチャネル形成層の底面と基体表面との間には絶縁材料層が形成されている半導体装置。 - チャネル形成層の底面と絶縁材料層を介して対向する基体の部分には、バック・バイアスが加えられる請求項10に記載の半導体装置。
- チャネル部の厚さをT1-CH、絶縁材料層の厚さをTInsとしたとき、
0.2≦T1-CH/TIns≦2
を満足する請求項10に記載の半導体装置。 - 第2電界効果トランジスタにおいて、チャネル形成層と絶縁材料層との間には、少なくとも1層の半導体層が形成されている請求項10に記載の半導体装置。
- チャネル形成層と半導体層との間、半導体層と半導体層との間には、層間絶縁層が形成されている請求項13に記載の半導体装置。
- 半導体層は、チャネル形成層の有する導電型とは反対の導電型を有する請求項13に記載の半導体装置。
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| CN201980048314.XA CN112437978A (zh) | 2018-07-26 | 2019-06-18 | 半导体装置 |
| US17/943,337 US11961885B2 (en) | 2018-07-26 | 2022-09-13 | Semiconductor device |
| US18/618,329 US12389647B2 (en) | 2018-07-26 | 2024-03-27 | Semiconductor device including a field effect transistor with nanostructure based laminated channel structure and a field effect transistor with a single channel structure |
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| US11450686B2 (en) * | 2020-06-29 | 2022-09-20 | Taiwan Semiconductor Manufacturing Co., Ltd. | High density 3D FERAM |
| KR20240099215A (ko) | 2021-11-12 | 2024-06-28 | 소니그룹주식회사 | 반도체 장치 |
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| US12389647B2 (en) | 2025-08-12 |
| KR102795237B1 (ko) | 2025-04-16 |
| US20230006042A1 (en) | 2023-01-05 |
| TW202008592A (zh) | 2020-02-16 |
| KR20210035804A (ko) | 2021-04-01 |
| CN112437978A (zh) | 2021-03-02 |
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| US20210280673A1 (en) | 2021-09-09 |
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| DE112019003768T5 (de) | 2021-04-22 |
| US11961885B2 (en) | 2024-04-16 |
| TW202508065A (zh) | 2025-02-16 |
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| US20250344465A1 (en) | 2025-11-06 |
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