WO2024106938A1 - 터널링 전계 효과 트랜지스터 - Google Patents
터널링 전계 효과 트랜지스터 Download PDFInfo
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- WO2024106938A1 WO2024106938A1 PCT/KR2023/018354 KR2023018354W WO2024106938A1 WO 2024106938 A1 WO2024106938 A1 WO 2024106938A1 KR 2023018354 W KR2023018354 W KR 2023018354W WO 2024106938 A1 WO2024106938 A1 WO 2024106938A1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D12/00—Bipolar devices controlled by the field effect, e.g. insulated-gate bipolar transistors [IGBT]
- H10D12/211—Gated diodes
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D12/00—Bipolar devices controlled by the field effect, e.g. insulated-gate bipolar transistors [IGBT]
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D12/00—Bipolar devices controlled by the field effect, e.g. insulated-gate bipolar transistors [IGBT]
- H10D12/01—Manufacture or treatment
- H10D12/021—Manufacture or treatment of gated diodes, e.g. field-controlled diodes [FCD]
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- H—ELECTRICITY
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- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D48/00—Individual devices not covered by groups H10D1/00 - H10D44/00
- H10D48/30—Devices controlled by electric currents or voltages
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- H—ELECTRICITY
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- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D64/00—Electrodes of devices having potential barriers
- H10D64/20—Electrodes characterised by their shapes, relative sizes or dispositions
- H10D64/27—Electrodes not carrying the current to be rectified, amplified, oscillated or switched, e.g. gates
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- H—ELECTRICITY
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- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D64/00—Electrodes of devices having potential barriers
- H10D64/20—Electrodes characterised by their shapes, relative sizes or dispositions
- H10D64/27—Electrodes not carrying the current to be rectified, amplified, oscillated or switched, e.g. gates
- H10D64/311—Gate electrodes for field-effect devices
- H10D64/411—Gate electrodes for field-effect devices for FETs
- H10D64/511—Gate electrodes for field-effect devices for FETs for IGFETs
- H10D64/514—Gate electrodes for field-effect devices for FETs for IGFETs characterised by the insulating layers
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- H—ELECTRICITY
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- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D64/00—Electrodes of devices having potential barriers
- H10D64/60—Electrodes characterised by their materials
- H10D64/66—Electrodes having a conductor capacitively coupled to a semiconductor by an insulator, e.g. MIS electrodes
- H10D64/68—Electrodes having a conductor capacitively coupled to a semiconductor by an insulator, e.g. MIS electrodes characterised by the insulator, e.g. by the gate insulator
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- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D64/00—Electrodes of devices having potential barriers
- H10D64/60—Electrodes characterised by their materials
- H10D64/66—Electrodes having a conductor capacitively coupled to a semiconductor by an insulator, e.g. MIS electrodes
- H10D64/68—Electrodes having a conductor capacitively coupled to a semiconductor by an insulator, e.g. MIS electrodes characterised by the insulator, e.g. by the gate insulator
- H10D64/681—Electrodes having a conductor capacitively coupled to a semiconductor by an insulator, e.g. MIS electrodes characterised by the insulator, e.g. by the gate insulator having a compositional variation, e.g. multilayered
Definitions
- the present invention relates to semiconductor devices, and more particularly to tunneling field effect transistors.
- tunneling field effect transistors operate using tunneling between source-channel-drain without operation such as depletion or inversion of the channel region, so they have a low subthreshold swing. It is known to be suitable for low-power devices because it can implement .
- tunneling field effect transistors may have the disadvantage of being somewhat complicated in the process, such as preventing alignment errors, as the source and drain must be doped with dopants of different conductivity types. Additionally, the tunneling field effect transistor may have the disadvantage of making it difficult to secure high on-current characteristics as the on-current is induced by tunneling.
- the problem to be solved by the present invention is to provide a tunneling field effect transistor that exhibits high on-current characteristics while having a relatively simple manufacturing process.
- the tunneling field effect transistor includes a semiconductor layer disposed on a substrate, a gate electrode disposed on or below the semiconductor layer and overlapping the semiconductor layer, and a source electrode and drain respectively connected to at least both sides of the semiconductor layer. Contains electrodes.
- the semiconductor layer includes a first semiconductor region connected to the source electrode and a second semiconductor region connected to the drain electrode, and the bandgap of the first semiconductor region is smaller than the bandgap of the second semiconductor region.
- the work function of the first semiconductor region may be greater than the work function of the second semiconductor region.
- the first semiconductor region and the second semiconductor region have Si 1-x Ge x patterns (0 ⁇ x ⁇ 1), but the Si content of the second semiconductor region may be greater than that of the first semiconductor region.
- the first semiconductor region has a Si 1-x Ge x pattern, and x may be 0.5 or more and 1 or less.
- the second semiconductor region has a Si 1-x Ge x pattern, and x may be 0 or more and less than 0.5.
- the gate electrode has a first gate region overlapping the first semiconductor region and a second gate region overlapping the second semiconductor region, and the metal pattern of the first gate region is compared to the metal pattern of the second gate region.
- the work function can be large.
- the first gate region may be a metal pattern with a work function of 4.4 to 4.7 eV
- the second gate region may be a metal pattern with a work function of 4.1 to 4.4 eV.
- the gate insulating film includes a first gate insulating film region overlapping the first semiconductor region and a second gate insulating film region overlapping the second semiconductor region, and the first gate insulating film region has a dielectric constant compared to the second gate insulating film region. It may be a larger insulating film.
- the first gate insulating film region may be a high dielectric constant insulating film with a higher dielectric constant compared to the silicon oxide film
- the second gate insulating film region may be a silicon oxide film or a low dielectric constant insulating film with a lower dielectric constant than the silicon oxide film.
- the thickness of the first semiconductor region may be lower than that of the second semiconductor region.
- one aspect of the present invention provides another embodiment of a tunneling field effect transistor.
- the tunneling field effect transistor is disposed on a substrate and includes a semiconductor layer having a first semiconductor region and a second semiconductor region.
- the band gap of the first semiconductor region is smaller than that of the second semiconductor region, and the work function of the first semiconductor region is greater than the work function of the second semiconductor region.
- a gate electrode overlapping the semiconductor layer is disposed on or below the semiconductor layer.
- a source electrode and a drain electrode are respectively connected to the first semiconductor region and the second semiconductor region.
- the first semiconductor region has a source region of a first conductivity type in an area adjacent to the source electrode and a first channel region overlapping with the gate electrode, and the second semiconductor region has a second channel area in an area adjacent to the drain electrode. It has a conductive drain region and a second channel region overlapping with the gate electrode. In the on-state, the conduction band potential energy of the first channel region is equal to or greater than the conduction band potential energy of the second channel region.
- the gate electrode has a first gate region overlapping the first semiconductor region and a second gate region overlapping the second semiconductor region, and the metal pattern of the first gate region is compared to the metal pattern of the second gate region.
- the work function can be large.
- the first semiconductor region and the second semiconductor region have Si 1-x Ge x patterns (0 ⁇ x ⁇ 1), but the Si content of the second semiconductor region may be greater than that of the first semiconductor region.
- the first semiconductor region has a Si 1-x Ge x pattern, and x may be 0.5 or more and 1 or less.
- the second semiconductor region has a Si 1-x Ge x pattern, and x may be 0 or more and less than 0.5.
- the gate insulating film includes a first gate insulating film region overlapping the first semiconductor region and a second gate insulating film region overlapping the second semiconductor region, and the first gate insulating film region has a dielectric constant compared to the second gate insulating film region. It may be a larger insulating film.
- the first gate insulating film region may be a high dielectric constant insulating film with a higher dielectric constant compared to the silicon oxide film
- the second gate insulating film region may be a silicon oxide film or a low dielectric constant insulating film with a lower dielectric constant than the silicon oxide film.
- FIG. 1 is a cross-sectional view of a tunneling field effect transistor according to an embodiment of the present invention.
- FIGS. 2A and 2B are band diagrams of the semiconductor layer when the transistor shown in FIG. 1 is in an off state and an on state, respectively.
- FIG. 3 is a perspective view showing a tunneling field effect transistor according to an embodiment of the present invention
- FIG. 4 is a cross-sectional view taken along line II' of FIG. 1.
- FIGS. 5A and 5B are band diagrams of the semiconductor layer when the transistor shown in FIG. 4 is in an off state and an on state, respectively.
- Figure 6 is a cross-sectional view showing a tunneling field effect transistor according to an embodiment of the present invention.
- Figure 7 is a cross-sectional view showing a tunneling field effect transistor according to an embodiment of the present invention.
- FIGS. 8A to 8H are perspective views sequentially showing a method of manufacturing a semiconductor layer in the embodiments described with reference to FIGS. 1, 4, 6, and 7.
- FIG. 1 is a cross-sectional view of a tunneling field effect transistor according to an embodiment of the present invention.
- FIGS. 2A and 2B are band diagrams of the semiconductor layer when the transistor shown in FIG. 1 is in an off state and an on state, respectively.
- a substrate 100 may be provided.
- the substrate 100 may be a semiconductor substrate, a metal substrate, a glass substrate, or a flexible substrate.
- the flexible substrate may be a polymer substrate, such as a polyethylene terephthalate (PET) or polyimide (PI) substrate. Elements for operation circuits, etc. may be formed on the substrate 100.
- a protective layer 110 such as an insulating film, may be formed to cover the substrate or the device.
- the protective layer 110 may be a silicon oxide film, a silicon nitride film, or a composite layer thereof.
- a semiconductor layer 120 or a channel layer may be formed on the protective layer 110.
- the semiconductor layer 120 may include a first semiconductor region 121 and a second semiconductor region 123 having different band gaps. Both the first semiconductor region 121 and the second semiconductor region 123 may be intrinsic semiconductor patterns.
- the band gap of the first semiconductor region 121 may be smaller than that of the second semiconductor region 123. Additionally, the work function of the first semiconductor region 121 may be greater than that of the second semiconductor region 123. In this case, the conduction band potential energy of the second semiconductor region 123 is large compared to the conduction band potential energy of the first semiconductor region 121, so a conduction band offset may occur between the two.
- the first semiconductor region 121 and the second semiconductor region 123 are Si 1-x Ge x patterns (0 ⁇ x ⁇ 1), but the second semiconductor region ( 123) may have a large Si content.
- each of the first semiconductor region 121 and the second semiconductor region 123 has a single crystalline Si 1-x Ge x pattern, a polycrystalline Si 1-x Ge x pattern, or an amorphous Si 1-x Ge x pattern.
- the pattern as an example, may be an epi-grown single crystalline Si 1-x Ge x pattern.
- the first semiconductor region 121 has a Si 1-x Ge x pattern, where x is 0.5 or more. In other words, the content of Ge may be greater than the content of Si. Furthermore, x may be 0.9 or more and 1.
- the first semiconductor region 121 may be a Ge pattern, specifically, a single crystalline Ge pattern, a polycrystalline Ge pattern, or an amorphous Ge pattern, for example, an epitaxially grown single crystalline Ge pattern.
- the second semiconductor region 123 has a Si 1-x Ge x pattern, where x is less than 0.5. In other words, the Si content may be greater than the Ge content. Furthermore, x may be 0 or more and 0.1. When x is 0, the first semiconductor region 121 may be a Si pattern, specifically a single crystalline Si pattern, a polycrystalline Si pattern, or an amorphous Si pattern, for example, an epitaxially grown single crystalline Si pattern.
- a gate insulating layer 130 may be disposed on the semiconductor layer 120.
- the gate insulating film 130 may be a silicon oxide film, a silicon oxynitride film, an aluminum oxide film, an aluminum oxynitride film, or a composite film thereof.
- a gate electrode 140 overlapping with the semiconductor layer 120 may be formed on the gate insulating film 130.
- the gate electrode 140 may be a metal pattern selected from Al, Cr, Cu, Ta, Ti, Mo, W, or alloys thereof.
- An interlayer insulating film 150 may be formed on the gate electrode 140.
- the interlayer insulating film 150 may be a silicon oxide film, a silicon nitride film, or a composite film thereof.
- a source electrode 161 and a drain electrode are formed in the contact holes. (163) can be formed respectively. Accordingly, the source electrode 161 and the drain electrode 163 connected to at least both side surfaces of the semiconductor layer 120 can be formed, respectively.
- the gap between the gate electrode 140 and the source electrode 161 may be narrower than the gap between the gate electrode 140 and the drain electrode 163. Let it happen. In this case, the on-state current of the transistor may increase while the ambipolar current may decrease.
- the source electrode 161 may be a metal electrode having a large work function compared to the work function of the semiconductor layer 120, specifically, the first semiconductor region 121 connected thereto.
- the source electrode 161 is made of nickel (Ni), iridium (Ir), or palladium (Pd) with a work function greater than Ge, for example, 5 eV or more. , may contain platinum (Pt).
- a charge plasma of the first conductivity type that is, a hole plasma
- a charge plasma of the first conductivity type that is, p A source region 121S of the type
- the area overlapping the gate electrode 140 in the first semiconductor region 121 excluding the p-type source region 121S may be defined as the first channel region 121C.
- the drain electrode 163 may be a metal electrode having a small work function compared to the work function of the semiconductor layer 120, specifically, the second semiconductor region 123 connected thereto.
- the drain electrode 163 is made of hafnium (Hf), indium (In), or zirconium (Zr) with a work function smaller than that of Si, for example, 4.2 eV or less. , may contain thallium (Tl).
- a charge plasma of a second conductivity type that is, an electron plasma
- a drain region 123D of a second conductivity type that is, n-type
- An area of the second semiconductor region 123 that overlaps the gate electrode 140 excluding the n-type drain region 123D may be defined as a second channel region 123C.
- the p-type source region 121S and the n-type drain region 123D can be induced into a conductive region through charge plasma generation without impurity doping using ion implantation or the like.
- the source region 121S is described as p-type and the drain region 123D is described as n-type, but this is not limited to this, and the source electrode 161 and the drain electrode 163 are made of a material having an appropriate work function.
- the source region 121S into an n-type and the drain region 123D into a p-type. Accordingly, the source region 121S may be defined as a region having a first conductivity type, and the drain region 123D may be defined as a region having a second conductivity type opposite to the first conductivity type.
- the gate electrode 140 is shown as being located on top of the semiconductor layer 120 and overlapping with the semiconductor layer 120, but the gate electrode 140 is not limited to this and the semiconductor layer ( It may be located below the semiconductor layer 120 and overlap the semiconductor layer 120.
- the source electrode 163 and the drain electrode 161 are shown as disposed on the top of the semiconductor layer 120, but are not limited to this and the source electrode 163 and the drain electrode 161 are It may be disposed below the semiconductor layer 120.
- the band gap of the first semiconductor region 121 is smaller than the band gap of the second semiconductor region 123, so that when the transistor is in the on state, the first channel is transmitted from the valence band of the source region 121S.
- Band To Band Tunneling (BTBT) may be easier due to the conduction band of region 121C. As a result, the on-current may increase.
- the band gap of the second semiconductor region 123 is relatively large, so that when the transistor is in an ambipolar state, the distance from the valence band of the second channel region 123C to the conduction band of the drain region 123D is increased.
- Band To Band Tunneling (BTBT) can be suppressed.
- the work function of the first semiconductor region 121 is that of the second semiconductor region 123. It may be greater than the work function.
- the conduction band potential energy of the second channel region (123C) is large compared to the conduction band potential energy of the first channel region (121C), so a conduction band offset is created between the two. It can happen.
- This conduction band offset may act as an on-current diffusion barrier and may be a factor in reducing the on-current. This can be solved through other embodiments described later.
- FIG. 3 is a perspective view showing a tunneling field effect transistor according to an embodiment of the present invention
- FIG. 4 is a cross-sectional view taken along line II' of FIG. 1.
- FIGS. 5A and 5B are band diagrams of the semiconductor layer when the transistor shown in FIG. 4 is in an off state and an on state, respectively. This embodiment may be substantially the same as the embodiment described with reference to FIGS. 1, 2, and 3, except as described later.
- the gate electrode 140 includes a first semiconductor region 121, specifically a first gate region 141 overlapping the first channel region 121C, and a first semiconductor region 121C.
- 2 Semiconductor region 123 Specifically, it may include a second gate region 143 overlapping the second channel region 123C.
- the interface where the first gate region 141 and the second gate region 143 are in contact with the interface where the first semiconductor region 121 and the second semiconductor region 123 are in contact will be aligned. You can.
- the interface where the first semiconductor region 121 and the second semiconductor region 123 contact and the interface where the first gate region 141 and the second gate region 143 contact are in the same plane. can be located
- Each of the metal pattern of the first gate region 141 and the metal pattern of the second gate region 143 is selected from Al, Cr, Cu, Ta, Ti, Mo, W, or an alloy thereof, under the following conditions: A metal pattern that satisfies these requirements can be selected.
- the metal pattern of the first gate region 141 may have a greater work function than the metal pattern of the second gate region 143.
- the first channel is formed by the charge plasma formed in the first channel region 121C and the second channel region 123C by the first gate region 141 and the second gate region 143, respectively.
- the conduction band potential energy of the region 121C may be equal to or greater than the conduction band potential energy of the second channel region 123C. Accordingly, the conduction band offset (offset in FIG. 3B) generated between the first semiconductor region 121 and the second semiconductor region 123 can be alleviated or eliminated.
- the work function of the metal pattern of the first gate region 141 is 0.2 to 0.4 eV, specifically about 0.5 to 0.35 eV, and more specifically 0.5 to 0.15 compared to the work function of the first semiconductor region 121. It can be as small as eV.
- the first gate region 141 is a metal pattern with a work function of about 4.4 to 4.7 eV, specifically. It may be a W (work function: about 4.63 eV) pattern or a Ru (work function: about 4.7 eV) pattern.
- the work function of the metal pattern of the second gate region 143 may be as small as 0.2 to 0.6 eV, specifically about 0.23 to 0.55 eV, and more specifically 0.5 to 0.54 eV compared to the work function of the second semiconductor region 123. there is.
- the second semiconductor region 123 is a Si pattern with a work function of about 4.63 eV
- the second gate region 143 is a metal pattern with a work function of about 4.1 to 4.4 eV, specifically. It may be an Al (work function: about 4.1 eV) pattern.
- the metal pattern of the first gate region 141 has a greater work function than the metal pattern of the second gate region 143, the first semiconductor region 121 and the second semiconductor region 123 )
- the conduction band offset (offset in Figure 3b) that was created between can be alleviated or eliminated. Accordingly, the on-state current can be improved compared to the embodiment described with reference to FIG. 1.
- Figure 6 is a cross-sectional view showing a tunneling field effect transistor according to an embodiment of the present invention. This embodiment may be substantially the same as the embodiment described with reference to FIG. 4 except as described later.
- the thickness of the first semiconductor region 121 may be smaller than the thickness of the second semiconductor region 123.
- the first semiconductor region 121 not only can a high concentration of charge plasma be generated within the first semiconductor region 121, specifically, the source region 121S, by the source electrode 161, but also the first semiconductor region 121 below the first gate region 141.
- Gate controllability of the first gate region 141 with respect to the 1 channel region 121C may be improved. Accordingly, the on-state current can be improved compared to the embodiment described with reference to FIG. 4.
- Figure 7 is a cross-sectional view showing a tunneling field effect transistor according to an embodiment of the present invention. This embodiment may be substantially the same as the embodiment described with reference to FIG. 1 except as described later.
- the gate insulating film 130 includes a first gate insulating film region 131 overlapping the first semiconductor region 121 and a second gate insulating film region 133 overlapping the second semiconductor region 123. It can be provided. Specifically, the interface where the first gate insulating film region 131 and the second gate insulating film region 133 are in contact is relative to the interface where the first semiconductor region 121 and the second semiconductor region 123 are in contact. It can be recognized. In one example, the interface where the first semiconductor region 121 and the second semiconductor region 123 contact and the interface where the first gate insulating layer region 131 and the second gate insulating layer region 133 contact are the same. It can be located within a plane.
- the first gate insulating film region 131 may be formed of an insulating film with a higher dielectric constant than the second gate insulating film region 133.
- the first gate insulating layer region 131 is a high dielectric constant insulating layer, that is, an insulating layer with a higher dielectric constant compared to the silicon oxide layer, and may be, for example, Al 2 O 3 or HfO 2 .
- the second gate insulating film region 133 is a silicon oxide film or an insulating film with a lower dielectric constant compared to the silicon oxide film, and may be, for example, nanoporous silica, fluorinated silicate, or an organic film, or a polyimide or polymer film, for example.
- the conduction band potential energy of the second channel region 123C may be lowered significantly compared to the first channel region 121C, thereby reducing the first channel region 121C.
- the conduction band offset (offset in FIG. 3B) generated between the semiconductor region 121 and the second semiconductor region 123 can be alleviated or eliminated. Accordingly, the on-state current can be improved compared to the embodiment described with reference to FIG. 4.
- FIGS. 8A to 8H are perspective views sequentially showing a method of manufacturing a semiconductor layer in the embodiments described with reference to FIGS. 1, 4, 6, and 7. This embodiment may be substantially the same as the embodiment described with reference to FIG. 1 except as described later.
- a protective layer 110 may be provided on the substrate 100.
- the preliminary semiconductor layer 127 is a Si 1-x Ge x layer, and the second semiconductor region 123 described with reference to FIG. 1 or described later It may be a layer having the same composition as.
- the preliminary semiconductor layer 127 is a Si 1-x Ge x layer, where x is less than 0.5. In other words, the Si content may be greater than the Ge content.
- x may be 0 or more and 0.1. When x is 0, the preliminary semiconductor layer 127 is a Si layer, and this state may correspond to a silicon-on-insulator (SOI) substrate.
- SOI silicon-on-insulator
- a mask film 129 may be provided on the preliminary semiconductor layer 127.
- the mask layer 129 may be a silicon nitride layer.
- an opening 129a may be formed in the mask layer 129 to expose the preliminary semiconductor layer 127.
- Ge is deposited on the preliminary semiconductor layer 127 in the opening 129a and a Ge condensation method through heat treatment is used to deposit the preliminary semiconductor layer (127) in the opening 129a. 127) can be converted into a preliminary first semiconductor region 121P.
- the Ge enrichment method deposits Ge on the Si 1- x Ge This is a technique in which the -x Ge You can. Accordingly, the preliminary first semiconductor region 121P is a Si 1-x Ge x layer, where x is 0.5 or more. In other words, the content of Ge may be greater than the content of Si. Furthermore, x may be 0.9 or more and 1. When x is 1, the first semiconductor region 121P may be a Ge layer.
- the mask layer 129 may be removed to expose the preliminary semiconductor layer 127.
- the thickness of the preliminary first semiconductor region 121P is shown to be lower than the thickness of the preliminary semiconductor layer 127. This may correspond to the embodiment described with reference to FIG. 6. However, it is not limited to this, and when various parameters are adjusted in the Ge enrichment method, the thickness of the first preliminary semiconductor region 121P and the thickness of the preliminary semiconductor layer 127 may be adjusted to be the same.
- a photoresist pattern PR may be formed on the preliminary first semiconductor region 121P and the preliminary semiconductor layer 127.
- the preliminary first semiconductor region 121P and the preliminary semiconductor layer 127 are patterned using the photoresist pattern PR as a mask, thereby forming the first semiconductor region 121P and the second semiconductor region.
- a semiconductor layer (120 in FIGS. 1, 4, 6, and 7) composed of (123P) can be formed.
- the photoresist pattern PR can be removed.
- a gate insulating film (130 in FIGS. 1, 4, 6, and 7) and a gate electrode are formed on the semiconductor layer (120 in FIGS. 1, 4, 6, and 7).
- interlayer insulating film (150 in FIGS. 1, 4, 6, and 7), source electrode (FIGS. 1, 4, 6, and 7) 7) and the drain electrode (163 in FIGS. 1, 4, 6, and 7) can be formed sequentially. At this time, this may mean that parts that are not specifically described can be formed using general semiconductor processes.
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Claims (17)
- 기판 상에 배치된 반도체층;상기 반도체층의 상부 또는 하부에 배치되고 상기 반도체층에 중첩하는 게이트 전극; 및상기 반도체층의 적어도 양측 측면들과 각각 접속하는 소오스 전극 및 드레인 전극을 포함하고,상기 반도체층은 상기 소오스 전극에 접속하는 제1 반도체 영역과 상기 드레인 전극에 접속하는 제2 반도체 영역을 구비하고, 상기 제1 반도체 영역의 밴드갭은 상기 제2 반도체 영역의 밴드갭 대비 작고,상기 제1 반도체 영역은 상기 소오스 전극에 인접한 영역에서 제1 도전형의 전하 플라즈마 생성에 의해 유도된 제1 도전형의 소오스 영역 및 이를 제외한 영역인 제1 채널 영역을 구비하고,상기 제2 반도체 영역은 상기 드레인 전극에 인접한 영역에서 제2 도전형의 전하 플라즈마 생성에 의해 유도된 제2 도전형의 드레인 영역 및 이를 제외한 영역인 제2 채널 영역을 구비하는, 터널링 전계 효과 트랜지스터.
- 청구항 1에 있어서,상기 제1 반도체 영역의 일함수는 상기 제2 반도체 영역의 일함수 대비 큰, 터널링 전계 효과 트랜지스터.
- 청구항 1 또는 청구항 2에 있어서,상기 제1 반도체 영역과 상기 제2 반도체 영역은 Si1-xGex 패턴들(0≤x≤1)이되, 상기 제1 반도체 영역 대비 상기 제2 반도체 영역의 Si 함량이 더 큰, 터널링 전계 효과 트랜지스터.
- 청구항 3에 있어서,상기 제1 반도체 영역은 Si1-xGex 패턴이되, x는 0.5 이상 1 이하인, 터널링 전계 효과 트랜지스터.
- 청구항 3에 있어서,상기 제2 반도체 영역은 Si1-xGex 패턴이되, x는 0 이상 0.5 미만인, 터널링 전계 효과 트랜지스터.
- 청구항 2에 있어서,상기 게이트 전극은 상기 제1 반도체 영역에 중첩된 제1 게이트 영역과 제2 반도체 영역에 중첩된 제2 게이트 영역을 구비하고,상기 제1 게이트 영역의 금속 패턴은 상기 제2 게이트 영역의 금속 패턴 대비 일함수가 큰, 터널링 전계 효과 트랜지스터.
- 청구항 6에 있어서,상기 제1 게이트 영역은 4.4 내지 4.7 eV의 일함수를 갖는 금속 패턴이고,상기 제2 게이트 영역은 4.1 내지 4.4 eV의 일함수를 갖는 금속 패턴인, 터널링 전계 효과 트랜지스터.
- 청구항 2에 있어서,상기 게이트 절연막은 제1 반도체 영역에 중첩된 제1 게이트 절연막 영역과 상기 제2 반도체 영역에 중첩된 제2 게이트 절연막 영역을 구비하고,상기 제1 게이트 절연막 영역은 상기 제2 게이트 절연막 영역 대비 유전율이 더 큰 절연막인, 터널링 전계 효과 트랜지스터.
- 청구항 8에 있어서,상기 제1 게이트 절연막 영역은 실리콘 산화막 대비 유전율이 큰 고유전율 절연막이고,상기 제2 게이트 절연막 영역은 실리콘 산화막 혹은 실리콘 산화막 대비 유전율이 작은 저유전율 절연막인, 터널링 전계 효과 트랜지스터.
- 청구항 1에 있어서,상기 제1 반도체 영역의 두께는 상기 제2 반도체 영역의 두께 대비 낮은, 터널링 전계 효과 트랜지스터.
- 기판 상에 배치되고, 제1 반도체 영역과 제2 반도체 영역을 구비하되, 상기 제1 반도체 영역의 밴드갭은 상기 제2 반도체 영역의 밴드갭 대비 작고, 상기 제1 반도체 영역의 일함수는 상기 제2 반도체 영역의 일함수 대비 큰, 반도체층;상기 반도체층의 상부 또는 하부에 배치되고 상기 반도체층에 중첩하는 게이트 전극;상기 제1 반도체 영역 및 상기 제2 반도체 영역에 각각 접속하는 소오스 전극 및 드레인 전극을 포함하되,상기 제1 반도체 영역은 상기 소오스 전극에 인접한 영역에서 제1 도전형의 소오스 영역 및 상기 게이트 전극과 중첩된 제1 채널 영역을 구비하고, 상기 제2 반도체 영역은 상기 드레인 전극에 인접한 영역에서 제2 도전형의 드레인 영역 및 상기 게이트 전극과 중첩된 제2 채널 영역을 구비하고,온-상태에서, 제1 채널 영역의 전도대 포텐셜 에너지는 제2 채널 영역의 전도대 포텐셜 에너지와 같거가 큰, 터널링 전계 효과 트랜지스터.
- 청구항 11에 있어서,상기 게이트 전극은 상기 제1 반도체 영역에 중첩된 제1 게이트 영역과 제2 반도체 영역에 중첩된 제2 게이트 영역을 구비하고,상기 제1 게이트 영역의 금속 패턴은 상기 제2 게이트 영역의 금속 패턴 대비 일함수가 큰, 터널링 전계 효과 트랜지스터.
- 청구항 11 또는 청구항 12에 있어서,상기 제1 반도체 영역과 상기 제2 반도체 영역은 Si1-xGex 패턴들(0≤x≤1)이되, 상기 제1 반도체 영역 대비 상기 제2 반도체 영역의 Si 함량이 더 큰, 터널링 전계 효과 트랜지스터.
- 청구항 13에 있어서,상기 제1 반도체 영역은 Si1-xGex 패턴이되, x는 0.5 이상 1 이하인, 터널링 전계 효과 트랜지스터.
- 청구항 13에 있어서,상기 제2 반도체 영역은 Si1-xGex 패턴이되, x는 0 이상 0.5 미만인, 터널링 전계 효과 트랜지스터.
- 청구항 11에 있어서,상기 게이트 절연막은 제1 반도체 영역에 중첩된 제1 게이트 절연막 영역과 상기 제2 반도체 영역에 중첩된 제2 게이트 절연막 영역을 구비하고,상기 제1 게이트 절연막 영역은 상기 제2 게이트 절연막 영역 대비 유전율이 더 큰 절연막인, 터널링 전계 효과 트랜지스터.
- 청구항 16에 있어서,상기 제1 게이트 절연막 영역은 실리콘 산화막 대비 유전율이 큰 고유전율 절연막이고,상기 제2 게이트 절연막 영역은 실리콘 산화막 혹은 실리콘 산화막 대비 유전율이 작은 저유전율 절연막인, 터널링 전계 효과 트랜지스터.
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| US20130119395A1 (en) * | 2011-11-16 | 2013-05-16 | Taiwan Semiconductor Manufacturing Company, Ltd. | Tunnel FET and Methods for Forming the Same |
| EP2887398A1 (en) * | 2013-12-18 | 2015-06-24 | Imec | A bilayer graphene tunneling field effect transistor |
| KR20200079879A (ko) * | 2018-12-26 | 2020-07-06 | 서강대학교산학협력단 | 터널링 전계효과 트랜지스터 및 이의 제조방법 |
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| US8890120B2 (en) * | 2012-11-16 | 2014-11-18 | Intel Corporation | Tunneling field effect transistors (TFETs) for CMOS approaches to fabricating N-type and P-type TFETs |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20130119395A1 (en) * | 2011-11-16 | 2013-05-16 | Taiwan Semiconductor Manufacturing Company, Ltd. | Tunnel FET and Methods for Forming the Same |
| EP2887398A1 (en) * | 2013-12-18 | 2015-06-24 | Imec | A bilayer graphene tunneling field effect transistor |
| KR20200079879A (ko) * | 2018-12-26 | 2020-07-06 | 서강대학교산학협력단 | 터널링 전계효과 트랜지스터 및 이의 제조방법 |
Non-Patent Citations (2)
| Title |
|---|
| KUMAR M. JAGADESH; JANARDHANAN SINDHU: "Doping-Less Tunnel Field Effect Transistor: Design and Investigation", IEEE TRANSACTIONS ON ELECTRON DEVICES, IEEE, USA, vol. 60, no. 10, 1 October 2013 (2013-10-01), USA, pages 3285 - 3290, XP011527419, ISSN: 0018-9383, DOI: 10.1109/TED.2013.2276888 * |
| LEE BYOUNG-SEOK; KIM MIN-WON; KIM JI-HUN; YOO SANG-DONG; SHIM TAE-HUN; HONG JIN-PYO; PARK JEA-GUN: "Doping-less tunnel field-effect transistors by compact Si drain frame/Si0.6Ge0.4-channel/Ge source", AIP ADVANCES, AMERICAN INSTITUTE OF PHYSICS, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747, vol. 11, no. 4, 2 April 2021 (2021-04-02), 2 Huntington Quadrangle, Melville, NY 11747 , XP012255315, DOI: 10.1063/5.0035370 * |
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