WO2023037430A1 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- WO2023037430A1 WO2023037430A1 PCT/JP2021/032950 JP2021032950W WO2023037430A1 WO 2023037430 A1 WO2023037430 A1 WO 2023037430A1 JP 2021032950 W JP2021032950 W JP 2021032950W WO 2023037430 A1 WO2023037430 A1 WO 2023037430A1
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 46
- 239000012535 impurity Substances 0.000 claims abstract description 38
- 239000000758 substrate Substances 0.000 claims description 22
- 238000009792 diffusion process Methods 0.000 description 9
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/70—Bipolar devices
- H01L29/72—Transistor-type devices, i.e. able to continuously respond to applied control signals
- H01L29/739—Transistor-type devices, i.e. able to continuously respond to applied control signals controlled by field-effect, e.g. bipolar static induction transistors [BSIT]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/70—Bipolar devices
- H01L29/72—Transistor-type devices, i.e. able to continuously respond to applied control signals
- H01L29/739—Transistor-type devices, i.e. able to continuously respond to applied control signals controlled by field-effect, e.g. bipolar static induction transistors [BSIT]
- H01L29/7393—Insulated gate bipolar mode transistors, i.e. IGBT; IGT; COMFET
- H01L29/7395—Vertical transistors, e.g. vertical IGBT
- H01L29/7396—Vertical transistors, e.g. vertical IGBT with a non planar surface, e.g. with a non planar gate or with a trench or recess or pillar in the surface of the emitter, base or collector region for improving current density or short circuiting the emitter and base regions
- H01L29/7397—Vertical transistors, e.g. vertical IGBT with a non planar surface, e.g. with a non planar gate or with a trench or recess or pillar in the surface of the emitter, base or collector region for improving current density or short circuiting the emitter and base regions and a gate structure lying on a slanted or vertical surface or formed in a groove, e.g. trench gate IGBT
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
Definitions
- the present disclosure relates to semiconductor devices.
- Patent Document 1 proposes a configuration in which a peripheral region is provided to surround the collector layer of the sense IGBT region in a plan view in order to suppress fluctuations in the characteristics of a sense IGBT (Insulated Gate Bipolar Transistor), which is a semiconductor element for sensing.
- sense IGBT Insulated Gate Bipolar Transistor
- the present disclosure has been made in view of the above problems, and aims to provide a technique capable of improving the accuracy of detecting the current in the main IGBT region using the current in the sense IGBT region. aim.
- a semiconductor device includes a semiconductor substrate, a first IGBT region and a diode region provided adjacent to each other on the semiconductor substrate, and provided on the semiconductor substrate apart from the first IGBT region and the diode region, a second IGBT region for detecting current flowing through the first IGBT region, the first IGBT region and the second IGBT region including one collector layer having a first conductivity type;
- the first IGBT region includes a cathode layer having a second conductivity type adjacent to the collector layer, and the second IGBT region further includes an impurity layer having a second conductivity type adjacent to the collector layer of the second IGBT region.
- the diode region is adjacent to the collector layer of the first IGBT region and includes a cathode layer having a second conductivity type
- the second IGBT region is adjacent to the collector layer of the second IGBT region and is of the second conductivity type. including an impurity layer having According to such a configuration, it is possible to improve the accuracy of detecting the current in the main IGBT region using the current in the sense IGBT region.
- FIG. 2 is a plan view showing the configuration of the back side of the semiconductor device according to Embodiment 1;
- FIG. 1 is a cross-sectional view showing the configuration of a semiconductor device according to a first embodiment;
- FIG. 9 is a cross-sectional view showing the configuration of a semiconductor device according to Modification 2 of Embodiment 1;
- a portion having a lower density than another portion means, for example, that the average density of the certain portion is lower than the average density of the other portion.
- the first conductivity type is p-type and the second conductivity type is n-type, but the first conductivity type may be p-type and the second conductivity type may be n-type. .
- FIG. 1 is a plan view showing the configuration of the back side of the semiconductor device according to the first embodiment
- FIG. 2 is a cross-sectional view showing the configuration along the line AB in FIG.
- the semiconductor device includes a semiconductor substrate 1, a main IGBT region 2 as a first IGBT region, a main diode region 3 as a diode region, and a sense IGBT region 5 as a second IGBT region. Note that the main IGBT region 2 and the main diode region 3 are included in the main region 4 .
- the main IGBT region 2 and the main diode region 3 are provided on the semiconductor substrate 1 adjacent to each other.
- the sense IGBT region 5 is provided in the semiconductor substrate 1 apart from the main region 4 including the main IGBT region 2 and the main diode region 3 .
- the semiconductor substrate 1 monolithically has the main IGBT region 2 , the main diode region 3 , and the sense IGBT region 5 .
- the semiconductor substrate 1 may be composed of a normal semiconductor wafer, or may be composed of an epitaxial growth layer.
- the material of semiconductor substrate 1 includes, for example, silicon (Si) or a wide bandgap semiconductor.
- Wide bandgap semiconductors include, for example, silicon carbide (SiC), gallium nitride (GaN), or diamond.
- the semiconductor substrate 1 that has undergone various manufacturing processes includes an n ⁇ -type drift layer 11, p-type base layers 12 and 32, n + -type source layers 13 and 33, and p + -type diffusion layers 14. , 34 , an n-type buffer layer 18 , a p-type collector layer 19 , an n-type cathode layer 20 and an n-type impurity layer 40 .
- the impurity concentration of the drift layer 11 is assumed to be the same as that of the semiconductor substrate 1 before undergoing various manufacturing processes, but the impurity concentration is not limited to this.
- the base layers 12 and 32 are selectively disposed on the drift layer 11, the source layer 13 and the diffusion layer 14 are selectively disposed on the base layer 12, and the source layer 33 and the diffusion layer 34 are disposed on the base layer. 32 is selectively arranged.
- the buffer layer 18 is arranged below the drift layer 11 , and the collector layer 19 , the cathode layer 20 and the impurity layer 40 are selectively arranged below the drift layer 11 .
- Main IGBT region 2 , main diode region 3 , and sense IGBT region 5 include one drift layer 11 , one buffer layer 18 , and one back electrode 21 .
- the main IGBT region 2 and main diode region 3 include one base layer 12 and one surface electrode 17 corresponding to the main region 4 .
- main IGBT region 2 and sense IGBT region 5 include one collector layer 19 .
- the main IGBT region 2, the main diode region 3, and the sense IGBT region 5 will be individually described.
- Main IGBT region 2 includes drift layer 11 , base layer 12 , source layer 13 , diffusion layer 14 , insulating film 15 , gate electrode 16 , surface electrode 17 , buffer layer 18 , collector layer 19 , and back electrode 21 .
- a first trench is provided from the upper surface of the source layer 13 to reach the drift layer 11 through the source layer 13 and the base layer 12 .
- the insulating film 15 is provided on the inner wall of the first trench, and the gate electrode 16 is provided above the first trench with the insulating film 15 interposed therebetween.
- a surface electrode 17 is provided on the surface of the base layer 12, the source layer 13, and the diffusion layer 14 (that is, the surface of the semiconductor substrate 1).
- a back surface electrode 21 is provided on the surface of the collector layer 19 (that is, the back surface of the semiconductor substrate 1).
- the main IGBT region 2 configured as described above includes a region functioning as a main IGBT.
- the main IGBT region 2 corresponds to the region of the main region 4 where the collector layer 19 is provided.
- Main diode region 3 includes drift layer 11 , base layer 12 , diffusion layer 14 , insulating film 25 , conductive portion 26 , surface electrode 17 , buffer layer 18 , cathode layer 20 and back electrode 21 .
- a second trench is provided from the upper surface of the base layer 12 to reach the drift layer 11 through the base layer 12 .
- the insulating film 25 is provided on the inner wall of the second trench, and the conductive portion 26 is provided above the second trench with the insulating film 25 interposed therebetween.
- Cathode layer 20 is adjacent to collector layer 19 of main IGBT region 2 .
- a surface electrode 17 is provided on the surface of the base layer 12 and the diffusion layer 14 (that is, the surface of the semiconductor substrate 1).
- a back surface electrode 21 is provided on the surface of the cathode layer 20 (that is, the back surface of the semiconductor substrate 1).
- the main diode region 3 configured as described above includes a region functioning as a main diode.
- the main diode region 3 corresponds to the region of the main region 4 where the cathode layer 20 is provided.
- Sense IGBT region 5 includes drift layer 11, base layer 32, source layer 33, diffusion layer 34, insulating films 35 and 45, gate electrode 36, conductive portion 46, surface electrode 37, buffer layer 18, collector layer 19, and impurity layers. 40 and a back electrode 21 .
- a third trench is provided from the upper surface of the source layer 33 to reach the drift layer 11 through the source layer 33 and the base layer 32 .
- the insulating film 35 is provided on the inner wall of the third trench, and the gate electrode 36 is provided above the third trench with the insulating film 35 interposed therebetween.
- a fourth trench is provided from the upper surface of the base layer 32 to reach the drift layer 11 through the base layer 32 .
- the insulating film 45 is provided on the inner wall of the fourth trench, and the conductive portion 46 is provided above the fourth trench with the insulating film 45 interposed therebetween.
- Impurity layer 40 is provided below conductive portion 46 and is adjacent to collector layer 19 of sense IGBT region 5 .
- the impurity layer 40 is formed without ion implantation, and the impurity concentration of the impurity layer 40 is the same or substantially the same as the impurity concentration of the drift layer 11 .
- a surface electrode 37 is provided on the surface of the base layer 32, the source layer 33, and the diffusion layer 34 (that is, the surface of the semiconductor substrate 1).
- a back surface electrode 21 is provided on the surface of the collector layer 19 and the impurity layer 40 (that is, the back surface of the semiconductor substrate 1).
- the sense IGBT region 5 configured as described above is a region for detecting current flowing through the main IGBT region 2 and includes a region functioning as a sense IGBT for detecting current flowing through the main IGBT region 2 .
- the area of the sense IGBT region 5 is, for example, approximately one-thousandth of the area of the main IGBT region 2 .
- the sense IGBT region 5 includes the impurity layer 40 , the hole injection reduction rate of the sense IGBT region 5 can be brought close to the hole injection reduction rate of the main IGBT region 2 . .
- the difference between the current density of the collector layer 19 of the sense IGBT region 5 and the current density of the main IGBT region 2 becomes small, and the current density of the collector layer 19 of the sense IGBT region 5 and the current of the main IGBT region 2 increases.
- the ratio can be approximated to their area ratio. Therefore, the accuracy of detecting the current in the main IGBT region 2 using the current in the collector layer 19 of the sense IGBT region 5 can be improved.
- the area ratio of impurity layer 40 to collector layer 19 in sense IGBT region 5 in plan view corresponds to the area ratio of cathode layer 20 to collector layer 19 in main IGBT region 2 in plan view. good too. That is, the area ratio of the impurity layer 40 to the collector layer 19 in the sense IGBT region 5 in plan view is the same or substantially the same as the area ratio of the cathode layer 20 to the collector layer 19 in the main IGBT region 2 in plan view. There may be.
- the two area ratios are substantially the same means that one of the two area ratios is within ⁇ 10% of the other area ratio, or ⁇ 5% depending on the configuration.
- the ratio between the current in collector layer 19 of sense IGBT region 5 and the current in main IGBT region 2 can be brought closer to their area ratio. Therefore, the accuracy of detecting the current in the main IGBT region 2 using the current in the collector layer 19 of the sense IGBT region 5 can be enhanced.
- the impurity concentration of the impurity layer 40 is the same or substantially the same as the impurity concentration of the drift layer 11 and different from the impurity concentration of the cathode layer 20.
- the n-type impurity concentration of the impurity layer 40 may correspond to the n-type impurity concentration of the cathode layer 20 . That is, the n-type impurity concentration of the impurity layer 40 may be the same as or substantially the same as the n-type impurity concentration of the cathode layer 20 .
- the two impurity concentrations are substantially the same means that one of the two impurity concentrations is within ⁇ 20% of the other impurity concentration, or ⁇ 5% depending on the configuration. means within the range of
- the ratio between the current in the impurity layer 40 of the sense IGBT region 5 and the current in the main diode region 3 can be made close to their area ratio during the freewheeling operation of the main diode region 3 . Therefore, the current in the impurity layer 40 of the sense IGBT region 5 can be used to improve the accuracy of detecting the current in the main diode region 3 during the freewheeling operation.
- the ratio of the current in the collector layer 19 of the sense IGBT region 5 and the current in the main IGBT region 2 can be brought closer to their area ratio. Therefore, the accuracy of detecting the current in the main IGBT region 2 using the current in the collector layer 19 of the sense IGBT region 5 can be enhanced.
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- Condensed Matter Physics & Semiconductors (AREA)
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- Metal-Oxide And Bipolar Metal-Oxide Semiconductor Integrated Circuits (AREA)
Abstract
Description
図1は、本実施の形態1に係る半導体装置の裏面側の構成を示す平面図であり、図2は、図1のA-B線に沿った構成を示す断面図である。
メインIGBT領域2は、ドリフト層11、ベース層12、ソース層13、拡散層14、絶縁膜15、ゲート電極16、表面電極17、バッファ層18、コレクタ層19、及び、裏面電極21を含む。
メインダイオード領域3は、ドリフト層11、ベース層12、拡散層14、絶縁膜25、導電部分26、表面電極17、バッファ層18、カソード層20、及び、裏面電極21を含む。
センスIGBT領域5は、ドリフト層11、ベース層32、ソース層33、拡散層34、絶縁膜35,45、ゲート電極36、導電部分46、表面電極37、バッファ層18、コレクタ層19、不純物層40、及び、裏面電極21を含む。
以上のように構成された半導体装置によれば、センスIGBT領域5が不純物層40を含むので、センスIGBT領域5のホール注入低下率を、メインIGBT領域2のホール注入低下率に近づけることができる。これにより、センスIGBT領域5のコレクタ層19の電流密度と、メインIGBT領域2の電流密度との差が小さくなり、センスIGBT領域5のコレクタ層19の電流と、メインIGBT領域2の電流との比率を、それらの面積比に近づけることができる。このため、センスIGBT領域5のコレクタ層19の電流を用いてメインIGBT領域2の電流を検出する精度を高めることができる。
実施の形態1において、平面視でのセンスIGBT領域5のコレクタ層19に対する不純物層40の面積比は、平面視でのメインIGBT領域2のコレクタ層19に対するカソード層20の面積比に対応してもよい。つまり、平面視でのセンスIGBT領域5のコレクタ層19に対する不純物層40の面積比は、平面視でのメインIGBT領域2のコレクタ層19に対するカソード層20の面積比と同じまたは実質的に同じであってもよい。ここでいう二つの面積比が実質的に同じであるとは、二つの面積比のうち、一方の面積比が他方の面積比の±10%の範囲内であること、構成によっては±5%の範囲内であることを意味する。このような構成によれば、センスIGBT領域5のコレクタ層19の電流と、メインIGBT領域2の電流との比率を、それらの面積比にさらに近づけることができる。このため、センスIGBT領域5のコレクタ層19の電流を用いてメインIGBT領域2の電流を検出する精度を高めることができる。
実施の形態1では、図1に示すように、不純物層40の不純物濃度は、ドリフト層11の不純物濃度と同じまたは実質的に同じであり、カソード層20の不純物濃度と異なっていたが、これに限ったものではない。例えば、図3に示すように、不純物層40のn型の不純物濃度は、カソード層20のn型の不純物濃度に対応してもよい。つまり、不純物層40のn型の不純物濃度は、カソード層20のn型の不純物濃度と同じまたは実質的に同じであってもよい。ここでいう二つの不純物濃度が実質的に同じであるとは、二つの不純物濃度のうち、一方の不純物濃度が他方の不純物濃度の±20%の範囲内であること、構成によっては±5%の範囲内であることを意味する。
Claims (3)
- 半導体基板と、
互いに隣接して前記半導体基板に設けられた第1IGBT領域及びダイオード領域と、
前記第1IGBT領域及び前記ダイオード領域と離間して前記半導体基板に設けられ、前記第1IGBT領域を流れる電流を検出するための第2IGBT領域と
を備え、
前記第1IGBT領域及び前記第2IGBT領域は、第1導電型を有する一のコレクタ層を含み、
前記ダイオード領域は、前記第1IGBT領域の前記コレクタ層と隣接し、第2導電型を有するカソード層を含み、
前記第2IGBT領域は、前記第2IGBT領域の前記コレクタ層と隣接し、第2導電型を有する不純物層をさらに含む、半導体装置。 - 請求項1に記載の半導体装置であって、
平面視での前記第2IGBT領域の前記コレクタ層に対する前記不純物層の面積比は、平面視での前記第1IGBT領域の前記コレクタ層に対する前記カソード層の面積比に対応する、半導体装置。 - 請求項1または請求項2に記載の半導体装置であって、
前記不純物層の第2導電型の不純物濃度は、前記カソード層の第2導電型の不純物濃度に対応する、半導体装置。
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CN202180102038.8A CN117916891A (zh) | 2021-09-08 | 2021-09-08 | 半导体装置 |
JP2023546611A JPWO2023037430A1 (ja) | 2021-09-08 | 2021-09-08 | |
DE112021008194.2T DE112021008194T5 (de) | 2021-09-08 | 2021-09-08 | Halbleitervorrichtung |
PCT/JP2021/032950 WO2023037430A1 (ja) | 2021-09-08 | 2021-09-08 | 半導体装置 |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012169348A (ja) * | 2011-02-10 | 2012-09-06 | Denso Corp | 半導体装置 |
WO2014013618A1 (ja) * | 2012-07-20 | 2014-01-23 | 三菱電機株式会社 | 半導体装置及びその製造方法 |
JP2019186510A (ja) * | 2018-03-30 | 2019-10-24 | 富士電機株式会社 | 半導体装置、半導体パッケージ、半導体モジュール、および半導体回路装置 |
JP2020113709A (ja) * | 2019-01-16 | 2020-07-27 | 株式会社デンソー | 半導体装置 |
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JP6958058B2 (ja) | 2017-07-21 | 2021-11-02 | 株式会社デンソー | 半導体装置 |
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- 2021-09-08 DE DE112021008194.2T patent/DE112021008194T5/de active Pending
- 2021-09-08 CN CN202180102038.8A patent/CN117916891A/zh active Pending
- 2021-09-08 JP JP2023546611A patent/JPWO2023037430A1/ja active Pending
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012169348A (ja) * | 2011-02-10 | 2012-09-06 | Denso Corp | 半導体装置 |
WO2014013618A1 (ja) * | 2012-07-20 | 2014-01-23 | 三菱電機株式会社 | 半導体装置及びその製造方法 |
JP2019186510A (ja) * | 2018-03-30 | 2019-10-24 | 富士電機株式会社 | 半導体装置、半導体パッケージ、半導体モジュール、および半導体回路装置 |
JP2020113709A (ja) * | 2019-01-16 | 2020-07-27 | 株式会社デンソー | 半導体装置 |
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CN117916891A (zh) | 2024-04-19 |
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