WO2020138168A1 - 相補型スイッチ素子 - Google Patents
相補型スイッチ素子 Download PDFInfo
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- WO2020138168A1 WO2020138168A1 PCT/JP2019/050823 JP2019050823W WO2020138168A1 WO 2020138168 A1 WO2020138168 A1 WO 2020138168A1 JP 2019050823 W JP2019050823 W JP 2019050823W WO 2020138168 A1 WO2020138168 A1 WO 2020138168A1
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- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 6
- 229910002704 AlGaN Inorganic materials 0.000 claims description 4
- 229910017115 AlSb Inorganic materials 0.000 claims description 4
- 229910000980 Aluminium gallium arsenide Inorganic materials 0.000 claims description 4
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Definitions
- the present invention relates to a complementary switch element.
- MOS metal-oxide film-semiconductor
- FET field effect transistors
- CMOS complementary MOSFET
- Silicon which is a group IV semiconductor, is mainly used as the material of the semiconductor substrate.
- a sub-threshold (mV/digit) is used as an index showing the switch characteristics of CMOS.
- the sub-threshold value corresponds to the minimum drive voltage for turning on the MOSFET.
- the switch characteristics of the conventional MOSFET are based on the diffusion phenomenon of electrons and holes (carriers). Therefore, in the conventional MOSFET, the theoretical minimum value of the sub-threshold slope is 60 mV/digit, and the switch characteristic showing the sub-threshold smaller than this cannot be realized.
- TFET tunnel FET
- Bhuwalka, KK, Schulze, J. and Eisele I., "Scaling the vertical tunnel FET with tunnel bandgap modulation and gate workfunction engineering", IEEEtransactions on electrondevices, Vol.52, No.5, Maypp(May) .909-917. Bhuwalka, KK, Schulze, J. and Eisele, I., A simulation approach to optimize the electrical parameters of a vertical tunnel FET”, IEEEtransactions on electrondevices, Vol.52, No.7, Julypp .1541-1547.
- TFET complementary switching device
- MOSFET complementary switching device
- the TFET is not easy to integrate like a MOSFET in which the structure of the source region and the drain region is symmetrical.
- An object of the present invention is to provide a complementary switch element including a TFET that can be easily integrated.
- a first complementary switching element of the present invention includes a first tunnel field effect transistor having a channel of a first conductivity type and a second tunnel field effect transistor having a channel of a second conductivity type different from the first conductivity type. And the first tunnel field effect transistor and the second tunnel field effect transistor each have a (111) plane, and the group IV semiconductor is doped to the first conductivity type.
- a III-V compound semiconductor nanowire comprising a substrate, a first region arranged on the (111) plane and connected to the (111) plane, and a second region doped with the second conductivity type.
- the second electrode is a source electrode
- the first electrode is a drain electrode
- the second tunnel field effect transistor the first electrode is a source electrode.
- the second electrode is a drain electrode.
- a second complementary switching element of the present invention includes a first tunnel field effect transistor having a first conductivity type channel and a second tunnel field effect transistor having a second conductivity type channel different from the first conductivity type.
- the first tunnel field effect transistor and the second tunnel field effect transistor are respectively doped with a first region having a (111) plane and the first conductivity type.
- a group IV semiconductor substrate including a second region; a group III-V compound semiconductor nanowire disposed on the (111) plane and undoped or doped to the second conductivity type; A first electrode connected to the group V compound semiconductor nanowire, a second electrode connected to the second region, and a gate for applying an electric field to the interface between the group III-V compound semiconductor nanowire and the (111) plane
- a complementary switch element including a TFET that can be easily integrated. Therefore, according to the present invention, it is possible to provide a semiconductor microprocessor and a highly integrated circuit that consume less power.
- FIG. 1 is a sectional view showing the configuration of the complementary switch element according to the first embodiment.
- FIG. 2 is a band structure diagram of the first TFET and the second TFET of the complementary switch element according to the first embodiment.
- FIG. 3 is a graph showing the electrical characteristics of the first TFET (p-TFET) and the second TFET (n-TFET).
- FIG. 4A is a graph showing the electric characteristics of the second TFET (n-TFET), and
- FIG. 4B is a graph showing the electric characteristics of the first TFET (p-TFET).
- 5A is a perspective view showing an example of an inverter configured using the complementary switch element according to the first embodiment, and FIG. 5B is a circuit diagram of the inverter shown in FIG. 5A.
- FIG. 6A to 6D are schematic diagrams showing an example of a method of manufacturing the complementary switch element according to the first embodiment.
- FIG. 7 is a cross-sectional view showing the configuration of the complementary switch element according to the second embodiment.
- FIG. 8 is a band structure diagram of the first TFET and the second TFET of the complementary switch element according to the second embodiment.
- FIG. 9 is a sectional view showing the configuration of the complementary switch element according to the third embodiment.
- FIG. 10 is a band structure diagram of the first TFET and the second TFET of the complementary switch element according to the third embodiment.
- FIG. 11 is a graph showing the electrical characteristics of the first TFET (n-TFET) and the second TFET (p-TFET).
- FIG. 12A is a perspective view showing an example of an inverter configured using the complementary switch element according to the third embodiment
- FIG. 12B is a circuit diagram of the inverter shown in FIG. 12A
- FIG. 13 is a graph showing the electrical characteristics of the fin-type first TFET (n-TFET) and the fin-type second TFET (p-TFET).
- 14A to 14D are schematic diagrams showing an example of a method of manufacturing the complementary switch element according to the third embodiment.
- FIG. 15 is a sectional view showing the structure of the complementary switch element according to the fourth embodiment.
- FIG. 16 is a band structure diagram of the first TFET and the second TFET of the complementary switch element according to the fourth embodiment.
- FIG. 1 is a cross-sectional view showing the configuration of the complementary switch element 100 according to the first embodiment.
- the switch element 100 of the first embodiment includes at least one first tunnel field effect transistor (first TFET) 101 and at least one second tunnel field effect transistor (second TFET) 102.
- first TFET first tunnel field effect transistor
- second TFET second tunnel field effect transistor
- the first TFET 101 is a TFET having a p-type channel (p-TFET), and the second TFET 102 is a TFET having an n-type channel (n-TFET).
- the first TFET 101 and the second TFET 102 have substantially the same configuration, but the first TFET 101 and the second TFET 102 have a source electrode (denoted by "S” in FIG. 1) and a drain electrode (denoted by "D” in FIG. 1). The positional relationship with is opposite.
- the first TFET 101 includes a group IV semiconductor substrate 111, an insulating film 112, a group III-V compound semiconductor nanowire 113, a gate dielectric film 114, an insulating protective film 115, a first electrode (drain electrode) 116, a second electrode (source electrode). 117 and a gate electrode 118.
- the III-V compound semiconductor nanowire 113 is composed of an undoped first region 113a and an n-type highly doped second region 113b.
- the first electrode 116 is a drain electrode and the second electrode 117 is a source electrode.
- a tunnel phenomenon occurs at the junction interface between the (111) plane of the group IV semiconductor substrate 111 and the group III-V compound semiconductor nanowire 113.
- the second TFET 102 includes a group IV semiconductor substrate 111, an insulating film 112, a group III-V compound semiconductor nanowire 123, a gate dielectric film 124, an insulating protective film 125, a first electrode (source electrode) 126, a second electrode (drain electrode). It has a 127 and a gate electrode 128.
- the III-V compound semiconductor nanowire 123 is composed of an undoped first region 123a and an n-type highly doped second region 123b.
- the first electrode 126 is a source electrode and the second electrode 127 is a drain electrode.
- a tunnel phenomenon occurs at the junction interface between the (111) plane of the IV group semiconductor substrate 111 and the III-V group compound semiconductor nanowire 123.
- the group IV semiconductor substrate 111 is a substrate made of a group IV semiconductor such as silicon or germanium, and the upper surface thereof is the (111) plane.
- the group IV semiconductor substrate 111 is, for example, a silicon (111) substrate.
- the group IV semiconductor substrate 111 is highly p-type doped.
- the entire group IV semiconductor substrate 111 may be doped, or only part of the group IV semiconductor substrate 111 may be doped.
- the group IV semiconductor substrate 111 forming the first TFET 101 and the group IV semiconductor substrate 111 forming the second TFET 102 are electrically or spatially separated.
- the first TFET 101 is configured by disposing a structure of a conduction type different from that of the group IV semiconductor substrate 111 between the group IV semiconductor substrate 111 of the first TFET 101 and the group IV semiconductor substrate 111 of the second TFET 102.
- the group IV semiconductor substrate 111 to be formed may be electrically separated from the group IV semiconductor substrate 111 forming the second TFET 102.
- two silicon thin wire structures formed on the BOX layer so as not to be in contact with each other are a group IV semiconductor substrate 111 forming the first TFET 101 and a group IV semiconductor substrate 111 forming the second TFET 102, respectively.
- the group IV semiconductor substrate 111 forming the first TFET 101 and the group IV semiconductor substrate 111 forming the second TFET 102 may be spatially separated.
- the insulating film 112 covers at least a surface ((111) surface) on which the III-V group compound semiconductor nanowire 113 and the III-V group compound semiconductor nanowire 123 are arranged, out of the two surfaces of the IV group semiconductor substrate 111. It is an insulating film.
- the insulating film 112 may or may not be formed on the other surface of the group IV semiconductor substrate 111 (the surface on which the group III-V compound semiconductor nanowire 113 and the group III-V compound semiconductor nanowire 123 are not arranged). It does not have to be.
- the insulating film 112 does not exist between the group IV semiconductor substrate 111 and the group III-V compound semiconductor nanowire 113 and between the group IV semiconductor substrate 111 and the first electrode (drain electrode) 116.
- the insulating film 112 does not exist between the group IV semiconductor substrate 111 and the group III-V compound semiconductor nanowire 123 and between the group IV semiconductor substrate 111 and the first electrode (source electrode) 126.
- the insulating film 112 include a silicon oxide film and a silicon nitride film.
- the insulating film 112 is a silicon oxide film having a film thickness of 20 nm.
- the III-V compound semiconductor nanowires 113 and 123 are structures made of III-V compound semiconductor and having a diameter of 2 to 100 nm and a length of 50 nm to 10 ⁇ m.
- the III-V group compound semiconductor nanowires 113 and 123 are arranged on the (111) plane of the IV group semiconductor substrate 111 such that their major axes are perpendicular to the (111) plane.
- the III-V group compound semiconductor may be a semiconductor composed of two elements, a semiconductor composed of three elements, a semiconductor composed of four elements, or a semiconductor composed of more elements. Examples of III-V compound semiconductors composed of two elements include InAs, InP, GaAs, GaN, InSb, GaSb and AlSb.
- III-V group compound semiconductors composed of three elements include AlGaAs, InGaAs, InGaN, AlGaN, GaNAs, InAsSb, GaAsSb, InGaSb and AlInSb.
- III-V group compound semiconductors composed of four or more elements include InGaAlN, AlInGaP, InGaAsP, GaInAsN, InGaAlSb, InGaAsSb and AlInGaPSb.
- the III-V compound semiconductor nanowires 113 and 123 are formed from the undoped first regions 113a and 123a (intrinsic semiconductor) and the n-type highly doped second regions 113b and 123b (n-type semiconductor). Become.
- the first regions 113a and 123a are connected to the (111) plane of the group IV semiconductor substrate 111.
- the second regions 113b and 123b are connected to the second electrodes 117 and 127.
- the first regions 113a and 123a of the III-V compound semiconductor nanowires 113 and 123 and the (111) plane of the IV semiconductor substrate 111 form a dislocation-free and defect-free junction interface.
- the gate dielectric films 114 and 124 are insulating films that cover at least part of the side surfaces of the III-V compound semiconductor nanowires 113 and 123. In this embodiment, the gate dielectric films 114 and 124 cover the entire side surfaces of the III-V compound semiconductor nanowires 113 and 123 and one surface (more accurately, the insulating film 112) of the IV semiconductor substrate 111. doing.
- the gate dielectric films 114 and 124 are high dielectric films such as hafnium aluminate (HfAlO x ) films.
- the insulating protective films 115 and 125 are films made of an insulating resin that cover the III-V group compound semiconductor nanowires 113 and 123, the gate dielectric films 114 and 124, and the gate electrodes 118 and 128.
- the type of insulating resin is not particularly limited, but is BCB resin, for example.
- the first electrodes 116 and 126 are arranged on the group IV semiconductor substrate 111 and are connected to the group IV semiconductor substrate 111 (p-type semiconductor).
- the first electrodes 116 and 126 are, for example, Ti/Au alloy films.
- the first electrodes 116 and 126 may be arranged on the surface of the group IV semiconductor substrate 111 on which the group III-V compound semiconductor nanowires 113 and 123 are arranged, or on the group IV semiconductor substrate 111. It may be arranged on the other surface (the surface on which the III-V compound semiconductor nanowires 113 and 123 are not arranged).
- the first electrode 116 functions as a drain electrode.
- the first electrode 126 functions as a source electrode.
- the second electrodes 117 and 127 are disposed on the III-V compound semiconductor nanowires 113 and 123 and the insulating protective films 115 and 125, and the second regions 113b and 123b of the III-V compound semiconductor nanowires 113 and 123 ( n-type semiconductor).
- the second electrodes 117 and 127 are, for example, Ti/Au alloy film or Ge/Au/Ni/Au alloy film.
- the second electrode 117 functions as a source electrode.
- the second electrode 127 functions as a drain electrode.
- the gate electrodes 118 and 128 are arranged so that an electric field can be applied to the junction interface between the group IV semiconductor substrate 111 and the first regions 113a and 123a of the group III-V compound semiconductor nanowires 113 and 123.
- the gate electrodes 118 and 128 are arranged on the gate dielectric films 114 and 124 so as to cover the periphery of the first regions 113a and 123a of the III-V compound semiconductor nanowires 113 and 123.
- the gate electrodes 118 and 128 are, for example, Ti/Au alloy films.
- the junction interface between the (111) plane of the IV group semiconductor substrate 111 and the first regions 113a and 123a of the III-V group compound semiconductor nanowires 113 and 123 functions as a tunnel layer.
- the first TFET 101 and the second TFET 102 have substantially the same configuration, but the first TFET 101 and the second TFET 102 have a source electrode (denoted by “S” in FIG. 1) and a drain electrode (denoted by “D” in FIG. 1). (Indicated by “”) is the opposite of the positional relationship.
- the present inventor simply replaces the positions of the electrodes in this way, and as shown in FIG.
- the first TFET 101 operates as a TFET (p-TFET) having a p-type channel
- the second TFET 102 operates as an n-type. It has been found that it operates as a TFET (n-TFET) having a channel of.
- FIG. 3 is a graph showing the electrical characteristics of the first TFET 101 (p-TFET) and the second TFET 102 (n-TFET). As shown in this graph, the sub-thresholds of the first TFET 101 and the second TFET 102 were both 40 mV/digit or less.
- FIG. 4A is a graph showing the relationship between the gate voltage V G and the drain current I D or the gate current I G in the second TFET 102 (n-TFET) at room temperature for each potential V DS of the drain electrode with respect to the source electrode.
- FIG. 4B is a graph showing the relationship between the gate voltage V G and the drain current I D in the first TFET 101 (p-TFET) at room temperature for each potential V DS of the drain electrode with respect to the source electrode.
- the sub-thresholds of the first TFET 101 and the second TFET 102 are 21 mV/digit in the minimum in the second TFET 102 and 40 mV/digit in average or less, and the first TFET101 It can be seen that the minimum is 6 mV/digit and the average is 40 mV/digit. It is also understood that the complementary switching operation can be performed with the same structure by exchanging the source electrode and the drain electrode.
- the switch element 100 can function as various complementary switch elements by appropriately connecting one or more first TFETs 101 and one or more second TFETs 102.
- FIG. 5A is a perspective view showing an example of an inverter configured using the complementary switch element 100
- FIG. 5B is a circuit diagram of the inverter shown in FIG. 5A.
- FIG. 5A shows an example in which the complementary switch element 100 is formed on the BOX layer, and the insulating film 112, the gate dielectric films 114 and 124, and the insulating protective films 115 and 125 are omitted.
- FIG. 5A shows an example in which the complementary switch element 100 is formed on the BOX layer, and the insulating film 112, the gate dielectric films 114 and 124, and the insulating protective films 115 and 125 are omitted.
- two silicon thin wire structures formed on the BOX layer so as not to be in contact with each other are respectively used as a group IV semiconductor substrate 111 forming the first TFET 101 and a group IV semiconductor substrate 111 forming the second TFET 102. There is.
- the method of manufacturing switch element 100 according to the present embodiment is not particularly limited.
- the first TFET 101 and the second TFET 102 can be manufactured, for example, by the method described in WO2011/040012.
- FIGS. 6A to 6D are schematic diagrams showing an example of a method of manufacturing the switch element 100. Since the first TFET 101 and the second TFET 102 are manufactured at the same time by the same procedure, only the first TFET 101 is shown in FIGS. 6A to 6D. Hereinafter, a method of manufacturing the switch element 100 will be described with reference to FIGS. 6A to 6D.
- a group IV semiconductor substrate 111 that is highly p-type doped is prepared.
- An insulating film 112 is formed on the (111 surface) of the group IV semiconductor substrate 111 by a thermal oxidation method or the like.
- an opening having a predetermined size for example, a diameter of 20 nm
- a III-V group compound semiconductor nanowire 113 is grown from the (111) plane of the IV group semiconductor substrate 111 exposed through the opening by MOVPE method.
- the III-V group compound semiconductor nanowire 113 Before growing the III-V group compound semiconductor nanowire 113, it is preferable to form a thin film of the III-V group compound semiconductor on the (111) plane of the IV group semiconductor substrate 111 by the alternating raw material supply modulation method. Publication No. 2011/040012).
- the second region 113b of the III-V compound semiconductor nanowire 113 was doped to be highly doped to the undoped first region 113a and n-type.
- the second region 113b is formed.
- a gate dielectric film 114, an insulating protective film 115, a first electrode 116, a second electrode 117 and a gate electrode 118 are formed.
- the switch element 100 In the switch element 100 according to this embodiment, the first TFET 101 (p-TFET) and the second TFET 102 (n-TFET) have substantially the same configuration. Therefore, the switch element 100 according to the present embodiment can be easily integrated even though it is a complementary switch element including a TFET.
- Embodiment 2 shows an example of the complementary switch element according to the present invention, in which a group III-V compound semiconductor nanowire extends vertically from the surface of an n-type heavily doped group IV semiconductor substrate.
- FIG. 7 is a cross-sectional view showing the configuration of the complementary switch element 200 according to the second embodiment.
- the same components as those of the TFET of the first embodiment are designated by the same reference numerals, and the description of the overlapping portions will be omitted.
- the switch element 200 includes at least one first tunnel field effect transistor (first TFET) 201 and at least one second tunnel field effect transistor (second TFET) 202.
- first TFET first tunnel field effect transistor
- second TFET second tunnel field effect transistor
- the first TFET 201 is a TFET (n-TFET) having an n-type channel
- the second TFET 202 is a TFET (p-TFET) having a p-type channel.
- the first TFET 201 and the second TFET 202 have substantially the same configuration, but in the first TFET 201 and the second TFET 202, the source electrode (indicated by “S” in FIG. 7) and the drain electrode (indicated by “D” in FIG. 7). The positional relationship with is opposite.
- the first TFET 201 includes a group IV semiconductor substrate 211, an insulating film 112, a III-V group compound semiconductor nanowire 213, a gate dielectric film 114, an insulating protective film 115, a first electrode (drain electrode) 116, a second electrode (source electrode). 117 and a gate electrode 118.
- the III-V compound semiconductor nanowire 213 is composed of an undoped first region 213a and a p-type highly doped second region 213b.
- the first electrode 116 is a drain electrode and the second electrode 117 is a source electrode.
- a tunnel phenomenon occurs at the junction interface between the (111) plane of the IV semiconductor substrate 211 and the III-V compound semiconductor nanowire 213.
- the second TFET 202 includes a group IV semiconductor substrate 211, an insulating film 112, a III-V compound semiconductor nanowire 223, a gate dielectric film 124, an insulating protective film 125, a first electrode (source electrode) 126, a second electrode (drain electrode). It has a 127 and a gate electrode 128.
- the III-V compound semiconductor nanowire 223 is composed of an undoped first region 223a and a p-type highly doped second region 223b.
- the first electrode 126 is a source electrode and the second electrode 127 is a drain electrode.
- a tunnel phenomenon occurs at the junction interface between the (111) plane of the IV semiconductor substrate 211 and the III-V compound semiconductor nanowire 223.
- the group IV semiconductor substrate 211 is a substrate made of a group IV semiconductor such as silicon or germanium, and the upper surface thereof is the (111) plane.
- the group IV semiconductor substrate 211 is, for example, a silicon (111) substrate.
- the group IV semiconductor substrate 211 is highly n-type doped.
- the entire group IV semiconductor substrate 211 may be doped, or only part of the group IV semiconductor substrate 211 may be doped.
- the group IV semiconductor substrate 211 that constitutes the first TFET 201 and the group IV semiconductor substrate 211 that constitutes the second TFET 202 are electrically or spatially separated.
- the first TFET 201 is configured by disposing a structure having a conduction type different from that of the group IV semiconductor substrate 211 between the group IV semiconductor substrate 211 forming the first TFET 201 and the group IV semiconductor substrate 211 forming the second TFET 202.
- the group IV semiconductor substrate 211 that operates and the group IV semiconductor substrate 211 that forms the second TFET 202 may be electrically separated.
- two silicon thin wire structures formed on the BOX layer so as not to be in contact with each other are a group IV semiconductor substrate 211 forming the first TFET 201 and a group IV semiconductor substrate 211 forming the second TFET 202.
- the group IV semiconductor substrate 211 forming the first TFET 201 and the group IV semiconductor substrate 211 forming the second TFET 202 may be spatially separated.
- the III-V compound semiconductor nanowires 213 and 223 are structures made of III-V compound semiconductor and having a diameter of 2 to 100 nm and a length of 50 nm to 10 ⁇ m.
- the III-V group compound semiconductor nanowires 213 and 223 are arranged on the (111) plane of the IV group semiconductor substrate 211 such that their major axes are perpendicular to the (111) plane.
- the III-V group compound semiconductor may be a semiconductor composed of two elements, a semiconductor composed of three elements, a semiconductor composed of four elements, or a semiconductor composed of more elements.
- the III-V group compound semiconductor nanowires 213, 223 are composed of undoped first regions 213a, 223a (intrinsic semiconductor) and p-type highly doped second regions 213b, 223b (p-type semiconductor).
- the first regions 213a and 223a are connected to the (111) plane of the IV group semiconductor substrate 211.
- the second regions 213b and 223b are connected to the second electrodes 117 and 127.
- the first regions 213a and 223a of the III-V compound semiconductor nanowires 213 and 223 and the (111) plane of the IV semiconductor substrate 211 basically form a dislocation-free and defect-free junction interface.
- the junction interface between the (111) plane of the IV group semiconductor substrate 211 and the first regions 213a and 223a of the III-V group compound semiconductor nanowires 213 and 223 functions as a tunnel layer.
- the first TFET 201 and the second TFET 202 have substantially the same configuration, but the first TFET 201 and the second TFET 202 have a source electrode (indicated by “S” in FIG. 7) and a drain electrode (in FIG. 7, “D”). (Indicated by “”) is the opposite of the positional relationship.
- the first TFET 201 operates as a TFET (n-TFET) having an n-type channel
- the second TFET 202 is a p-type. It has been found that it operates as a TFET (p-TFET) having a channel of. Therefore, by appropriately connecting one or more first TFETs 201 and one or more second TFETs 202, it is possible to function as various complementary switch elements.
- the manufacturing method of the switch element 200 according to the present embodiment is not particularly limited.
- the switch element 200 of the second embodiment can be manufactured by the same procedure as the switch element 100 of the first embodiment.
- the switch element 200 (effect)
- the first TFET 201 n-TFET
- the second TFET 202 p-TFET
- the switch element 200 according to the present embodiment can be easily integrated even though it is a complementary switch element including a TFET.
- the third embodiment shows an example of the complementary switch element according to the present invention, in which the III-V compound semiconductor nanowires extend obliquely from the surface of the p-type low-doped group IV semiconductor substrate. ..
- FIG. 9 is a sectional view showing the configuration of the complementary switch element 300 according to the third embodiment.
- the switch element 300 of the third embodiment includes at least one first tunnel field effect transistor (first TFET) 301 and at least one second tunnel field effect transistor (second TFET) 302.
- first TFET first tunnel field effect transistor
- second TFET second tunnel field effect transistor
- the first TFET 301 is a TFET (n-TFET) having an n-type channel
- the second TFET 302 is a TFET (p-TFET) having a p-type channel.
- the first TFET 301 and the second TFET 302 have substantially the same configuration, but in the first TFET 301 and the second TFET 302, the source electrode (indicated by “S” in FIG. 9) and the drain electrode (indicated by “D” in FIG. 9) are used. The positional relationship with is opposite.
- the first TFET 301 includes a group IV semiconductor substrate 311, a group III-V compound semiconductor nanowire 312, an insulating film (gate dielectric film) 313, a first electrode (source electrode) 314, a second electrode (drain electrode) 315, and a gate electrode 316. Have. Part of the insulating film 313 also functions as a gate dielectric film.
- the group IV semiconductor substrate 311 includes an undoped first region 311a and an n-type highly doped second region 311b.
- the first electrode 314 is a source electrode and the second electrode 315 is a drain electrode.
- a tunnel phenomenon occurs at the junction interface between the (111) face 311c of the IV group semiconductor substrate 311 and the III-V group compound semiconductor nanowire 312.
- the second TFET 302 includes a group IV semiconductor substrate 311, a group III-V compound semiconductor nanowire 322, an insulating film (gate dielectric film) 323, a first electrode (drain electrode) 324, a second electrode (source electrode) 325, and a gate electrode 326. Have. Part of the region of the insulating film 323 also functions as a gate dielectric film.
- the group IV semiconductor substrate 311 includes an undoped first region 321a and an n-type highly doped second region 321b.
- the first electrode 324 is a drain electrode and the second electrode 325 is a source electrode.
- a tunnel phenomenon occurs at the junction interface between the (111) plane 321c of the IV semiconductor substrate 311 and the III-V compound semiconductor nanowire 322.
- the group IV semiconductor substrate 311 is a substrate made of a group IV semiconductor such as silicon or germanium, and the upper surface thereof is the (100) plane.
- the group IV semiconductor substrate 311 is, for example, a silicon (100) substrate.
- the group IV semiconductor substrate 311 is p-type lightly doped.
- the undoped first region 311a (intrinsic semiconductor) and n-type highly-doped one of the two surfaces of the group IV semiconductor substrate 311 on which the group III-V compound semiconductor nanowires 312 are arranged.
- the formed second regions 311b are formed adjacent to each other.
- the first region 311a has not only the (100) plane but also the (111) plane 311c.
- the undoped first region 321a (intrinsic semiconductor) and the n-type are formed on the surface of the group IV semiconductor substrate 311 on which the group III-V compound semiconductor nanowires 322 are arranged.
- Highly doped second regions 321b (n-type semiconductors) are formed adjacent to each other.
- the first region 321a has not only the (100) plane but also the (111) plane 321c.
- the III-V compound semiconductor nanowires 312 and 322 are structures made of a III-V compound semiconductor and having a diameter of 2 to 100 nm and a length of 50 nm to 10 ⁇ m.
- the III-V group compound semiconductor nanowires 312 and 322 are arranged on the (111) planes 311c and 321c of the IV group semiconductor substrate 311, with their major axes perpendicular to the (111) planes 311c and 321c.
- the III-V group compound semiconductor may be a semiconductor composed of two elements, a semiconductor composed of three elements, a semiconductor composed of four elements, or a semiconductor composed of more elements.
- III-V compound semiconductors composed of two elements include InAs, InP, GaAs, GaN, InSb, GaSb and AlSb.
- III-V group compound semiconductors composed of three elements include AlGaAs, InGaAs, InGaN, AlGaN, GaNAs, InAsSb, GaAsSb, InGaSb and AlInSb.
- III-V group compound semiconductors composed of four or more elements include InGaAlN, AlInGaP, InGaAsP, GaInAsN, InGaAlSb, InGaAsSb and AlInGaPSb.
- the III-V compound semiconductor nanowires 312 and 322 are either undoped or lightly p-type doped. In the present embodiment, the III-V compound semiconductor nanowires 312 and 322 are p-type lightly doped.
- the III-V compound semiconductor nanowires 312 and 322 and the (111) faces 311c and 321c of the IV semiconductor substrate 311 basically form a dislocation-free and defect-free bonding interface.
- the insulating films 313 and 323 cover at least the entire surfaces ((100) plane) of the first regions 311a and 321a of the group IV semiconductor substrate 311, and a part of the surfaces ((100) plane) of the second regions 311b and 321b. It is an insulating film. As described above, some regions of the insulating films 313 and 323 function as a gate dielectric film. In the present embodiment, the insulating films 313 and 323 are formed on the entire surfaces of the first regions 311a and 321a, a part of the surfaces of the second regions 311b and 321b, and the first electrodes 314 and 324 of the group IV semiconductor substrate 311. It covers the lower part.
- the insulating films 313 and 323 are high dielectric films such as hafnium aluminate (HfAlO x ) films.
- the first electrodes 314 and 324 are arranged on the group IV semiconductor substrate 311 via the insulating films 313 and 323, and are connected to the group III-V compound semiconductor nanowires 312 and 322 (p-type semiconductor).
- the first electrodes 314 and 324 are, for example, Ti/Au alloy films.
- the first electrode 314 functions as a source electrode.
- the first electrode 324 functions as a drain electrode.
- the second electrodes 315 and 325 are arranged on the second regions 311b and 321b of the group IV semiconductor substrate 311, and are connected to the second regions 311b and 321b (n-type semiconductor).
- the second electrodes 315 and 325 are, for example, Ti/Au alloy film or Ge/Au/Ni/Au alloy film.
- the second electrode 315 functions as a drain electrode.
- the second electrode 325 functions as a source electrode.
- the gate electrodes 316 and 326 are arranged so that an electric field can be applied to the junction interface between the first regions 311a and 321a of the group IV semiconductor substrate 311 and the group III-V compound semiconductor nanowires 312 and 322.
- the gate electrodes 316 and 326 are arranged on the insulating films (gate dielectric films) 313 and 323 on the first regions 311a and 321a.
- the gate electrodes 316 and 326 are, for example, Ti/Au alloy films.
- the junction interface between the (111) planes 311c and 321c of the IV group semiconductor substrate 311 and the III-V group compound semiconductor nanowires 312 and 322 functions as a tunnel layer.
- the first TFET 301 and the second TFET 302 have substantially the same configuration, but the first TFET 301 and the second TFET 302 have a source electrode (denoted by “S” in FIG. 9) and a drain electrode (“D” in FIG. 9). (Indicated by “”) is the opposite of the positional relationship.
- S source electrode
- D drain electrode
- the first TFET 301 operates as a TFET having an n-type channel (n-TFET), and the second TFET 302 is a p-type. It has been found that it operates as a TFET (p-TFET) having a channel of.
- FIG. 11 is a graph showing the electrical characteristics of the first TFET 301 (n-TFET) and the second TFET 302 (p-TFET). As shown in this graph, the sub-thresholds of the first TFET 301 and the second TFET 302 were both minimum 50 mV/digit.
- the switch element 300 can function as various complementary switch elements by appropriately connecting one or more first TFETs 301 and one or more second TFETs 302.
- FIG. 12A is a perspective view showing an example of an inverter configured using the complementary switch element 300
- FIG. 12B is a circuit diagram of the inverter shown in FIG. 12A.
- FIG. 12A shows an example in which the complementary switch element 300 is formed by forming the fin-type first TFET 301 and the fin-type second TFET 302 on the BOX layer, and a part of the group IV semiconductor substrate 311 is omitted. ing.
- FIG. 12A shows an example in which the complementary switch element 300 is formed by forming the fin-type first TFET 301 and the fin-type second TFET 302 on the BOX layer, and a part of the group IV semiconductor substrate 311 is omitted. ing.
- FIG. 13 is a graph showing electrical characteristics of the fin-type first TFET 301 (n-TFET) and the fin-type second TFET 302 (p-TFET). As shown in this graph, the sub-thresholds of the first TFET 301 and the second TFET 302 were both 40 mV/digit or less.
- the method of manufacturing switch element 300 according to the present embodiment is not particularly limited.
- the first TFET 301 and the second TFET 302 can be manufactured, for example, by the method described in WO2011/040012.
- FIGS. 14A to 14D are schematic views showing an example of a method of manufacturing the switch element 300. Since the first TFET 301 and the second TFET 302 are simultaneously manufactured in the same procedure, FIGS. 14A to 14D show only the first TFET 301. Hereinafter, a method of manufacturing the switch element 300 will be described with reference to FIGS. 14A to 14D.
- a group IV semiconductor substrate 311 is prepared. On the group IV semiconductor substrate 311, an undoped first region 311a and an n-type highly doped second region 311b are formed. Next, as shown in FIG. 14B, anisotropic etching is performed on the first region 311a of the group IV semiconductor substrate 311 to expose the (111) plane 311c. Further, the insulating film 313 is formed on the surface of the group IV semiconductor substrate 311 by a thermal oxidation method or the like. An opening is formed in the insulating film 313 so that the (111) surface 311c of the first region 311a of the group IV semiconductor substrate 311 is exposed. Next, as shown in FIG.
- a III-V compound semiconductor nanowire 312 is grown from the (111) plane 311c of the first region 311a through the opening by MOVPE method. At this time, it is preferable to form a thin film of a III-V compound semiconductor on the (111) plane 311c of the first region 311a by the alternating raw material supply modulation method before growing the III-V compound semiconductor nanowires 312 (International Publication No. 2011/040012). Finally, as shown in FIG. 14D, the first electrode 314, the second electrode 315, and the gate electrode 316 are formed.
- the switch element 300 according to the present embodiment the first TFET 301 (n-TFET) and the second TFET 302 (p-TFET) have substantially the same configuration. Therefore, the switch element 300 according to the present embodiment can be easily integrated even though it is a complementary switch element including a TFET.
- the fourth embodiment shows an example of the complementary switch element according to the present invention, in which the group III-V compound semiconductor nanowires extend obliquely from the surface of the n-type low-doped group IV semiconductor substrate. ..
- FIG. 15 is a sectional view showing the configuration of the complementary switch element 400 according to the fourth embodiment.
- the same components as those of the TFET of the third embodiment are designated by the same reference numerals, and the description of the overlapping portions will be omitted.
- the switch element 400 has at least one first tunnel field effect transistor (first TFET) 401 and at least one second tunnel field effect transistor (second TFET) 402.
- first TFET first tunnel field effect transistor
- second TFET second tunnel field effect transistor
- the first TFET 401 is a TFET having a p-type channel (p-TFET), and the second TFET 402 is a TFET having an n-type channel (n-TFET).
- the first TFET 401 and the second TFET 402 have substantially the same configuration, but the first TFET 401 and the second TFET 402 have a source electrode (indicated by “S” in FIG. 15) and a drain electrode (indicated by “D” in FIG. 15). The positional relationship with is opposite.
- the first TFET 401 includes a group IV semiconductor substrate 411, a group III-V compound semiconductor nanowire 412, an insulating film (gate dielectric film) 313, a first electrode (source electrode) 314, a second electrode (drain electrode) 315, and a gate electrode 316. Have. Part of the insulating film 313 also functions as a gate dielectric film.
- the group IV semiconductor substrate 411 includes an undoped first region 411a and a p-type highly doped second region 411b.
- the first electrode 314 is a source electrode and the second electrode 315 is a drain electrode.
- a tunnel phenomenon occurs at the junction interface between the (111) plane 411c of the IV group semiconductor substrate 411 and the III-V group compound semiconductor nanowire 412.
- the second TFET 402 includes a group IV semiconductor substrate 411, a group III-V compound semiconductor nanowire 422, an insulating film (gate dielectric film) 323, a first electrode (drain electrode) 324, a second electrode (source electrode) 325, and a gate electrode 326. Have. Part of the region of the insulating film 323 also functions as a gate dielectric film.
- the group IV semiconductor substrate 411 includes an undoped first region 421a and a p-type highly doped second region 421b.
- the first electrode 324 is a drain electrode and the second electrode 325 is a source electrode.
- a tunnel phenomenon occurs at the junction interface between the (111) plane 421c of the IV group semiconductor substrate 411 and the III-V group compound semiconductor nanowire 422.
- the group IV semiconductor substrate 411 is made of a group IV semiconductor such as silicon or germanium, and has a (100) surface on its upper surface.
- the group IV semiconductor substrate 411 is, for example, a silicon (100) substrate.
- the group IV semiconductor substrate 411 is n-type lightly doped.
- the surface on which the III-V group compound semiconductor nanowires 412 are arranged is the undoped first region 411a (intrinsic semiconductor) and p-type highly doped.
- the formed second regions 411b (p-type semiconductor) are formed so as to be adjacent to each other.
- the first region 411a has not only the (100) plane but also the (111) plane 411c.
- the undoped first region 421a (intrinsic semiconductor) and the p-type region are formed on the surface of the group IV semiconductor substrate 411 on which the group III-V compound semiconductor nanowire 422 is arranged.
- Highly doped second regions 421b (n-type semiconductors) are formed adjacent to each other.
- the first region 421a has not only the (100) plane but also the (111) plane 421c.
- the III-V group compound semiconductor nanowires 412 and 422 are structures made of a III-V group compound semiconductor and having a diameter of 2 to 100 nm and a length of 50 nm to 10 ⁇ m.
- the III-V group compound semiconductor nanowires 412 and 422 are arranged on the (111) planes 411c and 421c of the IV group semiconductor substrate 411 such that their major axes are perpendicular to the (111) planes 411c and 421c.
- the III-V group compound semiconductor may be a semiconductor composed of two elements, a semiconductor composed of three elements, a semiconductor composed of four elements, or a semiconductor composed of more elements.
- the III-V compound semiconductor nanowires 412 and 422 are either undoped or lightly n-doped. In the present embodiment, the III-V compound semiconductor nanowires 412 and 422 are p-type lightly doped. The III-V compound semiconductor nanowires 412 and 422 and the (111) planes 411c and 421c of the IV semiconductor substrate 411 form a dislocation-free and defect-free bonding interface.
- the junction interface between the (111) planes 411c and 421c of the group IV semiconductor substrate 411 and the group III-V compound semiconductor nanowires 412 and 422 functions as a tunnel layer.
- the first TFET 401 and the second TFET 402 have substantially the same configuration, but the first TFET 401 and the second TFET 402 have a source electrode (denoted by “S” in FIG. 15) and a drain electrode (“D” in FIG. 15). (Indicated by “”) is the opposite of the positional relationship.
- S source electrode
- D drain electrode
- the first TFET 401 operates as a TFET (p-TFET) having a p-type channel
- the second TFET 402 operates as an n-type. It has been found that it operates as a TFET (n-TFET) having a channel of. Therefore, by appropriately connecting one or more first TFETs 401 and one or more second TFETs 402, it is possible to function as various complementary switch elements.
- the method for manufacturing switch element 400 according to the present embodiment is not particularly limited.
- the switch element 400 of the fourth embodiment can be manufactured by the same procedure as the switch element 300 of the third embodiment.
- first TFET 401 p-TFET
- second TFET 402 n-TFET
- each TFET has a plurality of TFETs for one channel. It may have a multi-gate TFET in which a gate electrode is arranged.
- the complementary switch element of the present invention is useful as a switch element formed in, for example, a semiconductor microprocessor or a highly integrated circuit.
- first TFET First tunnel field effect transistor
- second TFET second tunnel field effect transistor
- Group IV semiconductor substrate Insulating film 113, 123, 213, 223 III-V group compound semiconductor nanowires 113a, 123a, 213a, 223a First region 113b, 123b, 213b, 223b Second region 114, 124 Gate dielectric Films 115 and 125 Insulation protective films 116 and 126 First electrodes 117 and 127 Second electrodes 118 and 128 Gate electrodes 300 and 400 Complementary switching devices 301 and 401 First tunnel field effect transistor (first TFET) 302,402 second tunnel field effect transistor (second TFET) 311,411 Group IV semiconductor substrate 311a, 321a, 411a, 421a First region 311b, 321b, 411b, 421b Second region 311c, 321c, 411c, 421c (111) plane 312, 322, 412,
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Abstract
Description
実施の形態1では、p型に高ドープされたIV族半導体基板の表面から垂直方向にIII-V族化合物半導体ナノワイヤが延在している、本発明に係る相補型スイッチ素子の例を示す。
図1は、実施の形態1に係る相補型スイッチ素子100の構成を示す断面図である。図1に示されるように、実施の形態1のスイッチ素子100は、少なくとも1つの第1トンネル電界効果トランジスタ(第1TFET)101および少なくとも1つの第2トンネル電界効果トランジスタ(第2TFET)102を有する。
本実施の形態に係るスイッチ素子100の製造方法は、特に限定されない。第1TFET101および第2TFET102は、例えば国際公開第2011/040012号に記載の方法で製造されうる。
本実施の形態に係るスイッチ素子100では、第1TFET101(p-TFET)および第2TFET102(n-TFET)は、実質的に同一の構成を有する。したがって、本実施の形態に係るスイッチ素子100は、TFETを含む相補型スイッチ素子でありながらも容易に集積化されうる。
実施の形態2では、n型に高ドープされたIV族半導体基板の表面から垂直方向にIII-V族化合物半導体ナノワイヤが延在している、本発明に係る相補型スイッチ素子の例を示す。
図7は、実施の形態2に係る相補型スイッチ素子200の構成を示す断面図である。実施の形態1のTFETと同じ構成要素については同一の符号を付し、重複箇所の説明を省略する。
本実施の形態に係るスイッチ素子200の製造方法は、特に限定されない。実施の形態2のスイッチ素子200は、実施の形態1のスイッチ素子100と同様の手順で作製することができる。
本実施の形態に係るスイッチ素子200では、第1TFET201(n-TFET)および第2TFET202(p-TFET)は、実質的に同一の構成を有する。したがって、本実施の形態に係るスイッチ素子200は、TFETを含む相補型スイッチ素子でありながらも容易に集積化されうる。
実施の形態3では、p型に低ドープされたIV族半導体基板の表面から斜めの方向にIII-V族化合物半導体ナノワイヤが延在している、本発明に係る相補型スイッチ素子の例を示す。
図9は、実施の形態3に係る相補型スイッチ素子300の構成を示す断面図である。図9に示されるように、実施の形態3のスイッチ素子300は、少なくとも1つの第1トンネル電界効果トランジスタ(第1TFET)301および少なくとも1つの第2トンネル電界効果トランジスタ(第2TFET)302を有する。
本実施の形態に係るスイッチ素子300の製造方法は、特に限定されない。第1TFET301および第2TFET302は、例えば国際公開第2011/040012号に記載の方法で製造されうる。
本実施の形態に係るスイッチ素子300では、第1TFET301(n-TFET)および第2TFET302(p-TFET)は、実質的に同一の構成を有する。したがって、本実施の形態に係るスイッチ素子300は、TFETを含む相補型スイッチ素子でありながらも容易に集積化されうる。
実施の形態4では、n型に低ドープされたIV族半導体基板の表面から斜めの方向にIII-V族化合物半導体ナノワイヤが延在している、本発明に係る相補型スイッチ素子の例を示す。
図15は、実施の形態4に係る相補型スイッチ素子400の構成を示す断面図である。実施の形態3のTFETと同じ構成要素については同一の符号を付し、重複箇所の説明を省略する。
本実施の形態に係るスイッチ素子400の製造方法は、特に限定されない。実施の形態4のスイッチ素子400は、実施の形態3のスイッチ素子300と同様の手順で作製することができる。
本実施の形態に係るスイッチ素子400では、第1TFET401(p-TFET)および第2TFET402(n-TFET)は、実質的に同一の構成を有する。したがって、本実施の形態に係るスイッチ素子400は、TFETを含む相補型スイッチ素子でありながらも容易に集積化されうる。
101,201 第1トンネル電界効果トランジスタ(第1TFET)
102,202 第2トンネル電界効果トランジスタ(第2TFET)
111,211 IV族半導体基板
112 絶縁膜
113,123,213,223 III-V族化合物半導体ナノワイヤ
113a,123a,213a,223a 第1領域
113b,123b,213b,223b 第2領域
114,124 ゲート誘電体膜
115,125 絶縁保護膜
116,126 第1電極
117,127 第2電極
118,128 ゲート電極
300,400 相補型スイッチ素子
301,401 第1トンネル電界効果トランジスタ(第1TFET)
302,402 第2トンネル電界効果トランジスタ(第2TFET)
311,411 IV族半導体基板
311a,321a,411a,421a 第1領域
311b,321b,411b,421b 第2領域
311c,321c,411c,421c (111)面
312,322,412,422 III-V族化合物半導体ナノワイヤ
313,323 絶縁膜(ゲート誘電体膜)
314,324 第1電極
315,325 第2電極
316,326 ゲート電極
Claims (6)
- 第1導電型のチャネルを有する第1トンネル電界効果トランジスタと、前記第1導電型と異なる第2導電型のチャネルを有する第2トンネル電界効果トランジスタと、を有する相補型スイッチ素子であって、
前記第1トンネル電界効果トランジスタおよび前記第2トンネル電界効果トランジスタは、それぞれ、
(111)面を有し、前記第1導電型にドープされたIV族半導体基板と、
前記(111)面上に配置され、前記(111)面に接続された第1領域と、前記第2導電型にドープされた第2領域とを含むIII-V族化合物半導体ナノワイヤと、
前記IV族半導体基板に接続された第1電極と、
前記第2領域に接続された第2電極と、
前記(111)面と前記第1領域との界面に電界を作用させるゲート電極と、
を有し、
前記第1トンネル電界効果トランジスタでは、前記第2電極がソース電極であり、かつ前記第1電極がドレイン電極であり、
前記第2トンネル電界効果トランジスタでは、前記第1電極がソース電極であり、かつ前記第2電極がドレイン電極である、
相補型スイッチ素子。 - 前記IV族半導体基板を構成するIV族半導体は、シリコンまたはゲルマニウムであり、
前記III-V族化合物半導体ナノワイヤを構成するIII-V族化合物半導体は、InAs、InP、GaAs、GaN、InSb、GaSb、AlSb、AlGaAs、InGaAs、InGaN、AlGaN、GaNAs、InAsSb、GaAsSb、InGaSb、AlInSb、InGaAlN、AlInGaP、InGaAsP、GaInAsN、InGaAlSb、InGaAsSbまたはAlInGaPSbであり、
前記III-V族化合物半導体ナノワイヤの長軸は、前記(111)面に対して垂直である、
請求項1に記載の相補型スイッチ素子。 - 前記第1トンネル電界効果トランジスタおよび前記第2トンネル電界効果トランジスタは、それぞれ、前記III-V族化合物半導体ナノワイヤの側面上に配置されたゲート誘電体膜をさらに有し、
前記ゲート電極は、前記ゲート誘電体膜上に配置されている、
請求項1または請求項2に記載の相補型スイッチ素子。 - 第1導電型のチャネルを有する第1トンネル電界効果トランジスタと、前記第1導電型と異なる第2導電型のチャネルを有する第2トンネル電界効果トランジスタと、を有する相補型スイッチ素子であって、
前記第1トンネル電界効果トランジスタおよび前記第2トンネル電界効果トランジスタは、それぞれ、
(111)面を有する第1領域と、前記第1導電型にドープされた第2領域とを含むIV族半導体基板と、
前記(111)面上に配置され、ドープされていないか、または前記第2導電型にドープされたIII-V族化合物半導体ナノワイヤと、
前記III-V族化合物半導体ナノワイヤに接続された第1電極と、
前記第2領域に接続された第2電極と、
前記III-V族化合物半導体ナノワイヤと前記(111)面との界面に電界を作用させるゲート電極と、
を有し、
前記第1トンネル電界効果トランジスタでは、前記第1電極がソース電極であり、かつ前記第2電極がドレイン電極であり、
前記第2トンネル電界効果トランジスタでは、前記第2電極がソース電極であり、かつ前記第1電極がドレイン電極である、
相補型スイッチ素子。 - 前記IV族半導体基板を構成するIV族半導体は、シリコンまたはゲルマニウムであり、
前記III-V族化合物半導体ナノワイヤを構成するIII-V族化合物半導体は、InAs、InP、GaAs、GaN、InSb、GaSb、AlSb、AlGaAs、InGaAs、InGaN、AlGaN、GaNAs、InAsSb、GaAsSb、InGaSb、AlInSb、InGaAlN、AlInGaP、InGaAsP、GaInAsN、InGaAlSb、InGaAsSbまたはAlInGaPSbであり、
前記III-V族化合物半導体ナノワイヤの長軸は、前記(111)面に対して垂直である、
請求項4に記載の相補型スイッチ素子。 - 前記第1トンネル電界効果トランジスタおよび前記第2トンネル電界効果トランジスタは、それぞれ、前記IV族半導体基板の表面上に配置されたゲート誘電体膜をさらに有し、
前記ゲート電極は、前記ゲート誘電体膜上に配置されている、
請求項4または請求項5に記載の相補型スイッチ素子。
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US11972985B2 (en) | 2024-04-30 |
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KR102608554B1 (ko) | 2023-11-30 |
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US20220084891A1 (en) | 2022-03-17 |
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