WO2022172328A1 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- WO2022172328A1 WO2022172328A1 PCT/JP2021/004782 JP2021004782W WO2022172328A1 WO 2022172328 A1 WO2022172328 A1 WO 2022172328A1 JP 2021004782 W JP2021004782 W JP 2021004782W WO 2022172328 A1 WO2022172328 A1 WO 2022172328A1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D30/00—Field-effect transistors [FET]
- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/64—Double-diffused metal-oxide semiconductor [DMOS] FETs
- H10D30/66—Vertical DMOS [VDMOS] FETs
- H10D30/668—Vertical DMOS [VDMOS] FETs having trench gate electrodes, e.g. UMOS transistors
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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]
- H10D12/411—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]
- H10D12/411—Insulated-gate bipolar transistors [IGBT]
- H10D12/441—Vertical IGBTs
- H10D12/461—Vertical IGBTs having non-planar surfaces, e.g. having trenches, recesses or pillars in the surfaces of the emitter, base or collector regions
- H10D12/481—Vertical IGBTs having non-planar surfaces, e.g. having trenches, recesses or pillars in the surfaces of the emitter, base or collector regions having gate structures on slanted surfaces, on vertical surfaces, or in grooves, e.g. trench gate IGBTs
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D30/00—Field-effect transistors [FET]
- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/64—Double-diffused metal-oxide semiconductor [DMOS] FETs
- H10D30/66—Vertical DMOS [VDMOS] FETs
- H10D30/669—Vertical DMOS [VDMOS] FETs having voltage-sensing or current-sensing structures, e.g. emulator sections or overcurrent sensing cells
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D62/00—Semiconductor bodies, or regions thereof, of devices having potential barriers
- H10D62/10—Shapes, relative sizes or dispositions of the regions of the semiconductor bodies; Shapes of the semiconductor bodies
- H10D62/13—Semiconductor regions connected to electrodes carrying current to be rectified, amplified or switched, e.g. source or drain regions
- H10D62/137—Collector regions of BJTs
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D62/00—Semiconductor bodies, or regions thereof, of devices having potential barriers
- H10D62/10—Shapes, relative sizes or dispositions of the regions of the semiconductor bodies; Shapes of the semiconductor bodies
- H10D62/13—Semiconductor regions connected to electrodes carrying current to be rectified, amplified or switched, e.g. source or drain regions
- H10D62/141—Anode or cathode regions of thyristors; Collector or emitter regions of gated bipolar-mode devices, e.g. of IGBTs
- H10D62/142—Anode regions of thyristors or collector regions of gated bipolar-mode devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D84/00—Integrated devices formed in or on semiconductor substrates that comprise only semiconducting layers, e.g. on Si wafers or on GaAs-on-Si wafers
- H10D84/101—Integrated devices comprising main components and built-in components, e.g. IGBT having built-in freewheel diode
- H10D84/141—VDMOS having built-in components
- H10D84/143—VDMOS having built-in components the built-in components being PN junction diodes
- H10D84/144—VDMOS having built-in components the built-in components being PN junction diodes in antiparallel diode configurations
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D64/00—Electrodes of devices having potential barriers
- H10D64/111—Field plates
- H10D64/117—Recessed field plates, e.g. trench field plates or buried field plates
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D8/00—Diodes
- H10D8/422—PN diodes having the PN junctions in mesas
Definitions
- the present disclosure relates to semiconductor devices.
- RC-IGBTs reverse-conducting IGBTs
- a generally used RC-IGBT has a main region and a sense region having a smaller operating area than the main region (see, for example, Patent Document 1).
- a current and voltage in the main region are monitored by a sense element formed in the sense region to detect whether an abnormality has occurred in the main region.
- a p-type collector layer was formed on the back surface of the substrate in the sense region.
- the built-in voltage at which the backside pn junction consisting of the p-type collector layer and the n-type drift layer turns on cannot be exceeded, resulting in an increase in the on-voltage.
- the conductivity is modulated, and snapback occurs in which the ON voltage drops suddenly. Therefore, there is a problem that control is difficult.
- the present disclosure has been made to solve the problems described above, and its object is to obtain a semiconductor device that can prevent snapback and improve detection sensitivity.
- a semiconductor device includes: a semiconductor substrate having a main region; a sense region having an operation area smaller than that of the main region; an IGBT formed in the main region; and a sense element formed in the sense region.
- a MOSFET having a gate electrode connected to the gate electrode of the IGBT; a surface electrode formed on the surface of the semiconductor substrate in the main region; and formed on the back surface of the semiconductor substrate in the main region and the sense region. and a current detection electrode formed on the surface in the sense region and separated from the surface electrode.
- the present disclosure since there is no pn junction on the back surface of the substrate in the sense region, snapback due to conductivity modulation does not occur.
- the IGBT is formed in the main region and the MOSFET is formed in the sense region, the on-voltage is lower in the sense region in the low current region. Therefore, it is possible to improve the detection sensitivity of the sense element by increasing the turn-on responsiveness in the low current region.
- FIG. 1 is a plan view showing a semiconductor device according to a first embodiment
- FIG. 2 is a cross-sectional view showing the main region of the semiconductor device according to Embodiment 1
- FIG. 2 is a cross-sectional view showing a sense region of the semiconductor device according to Embodiment 1
- FIG. 11 is a cross-sectional view showing a main region of a semiconductor device according to a second embodiment
- FIG. 10 is a cross-sectional view showing a sense region of a semiconductor device according to a second embodiment
- FIG. 1 is a plan view showing a semiconductor device according to Embodiment 1.
- FIG. A semiconductor substrate 1 has a main region 2 and a sense region 3 having a smaller operating area than the main region 2 .
- a gate pad 4 , a surface electrode 5 and a current detection electrode 6 are formed on the surface of the semiconductor substrate 1 .
- a surface electrode 5 is formed in the main region 2 .
- a current detection electrode 6 is formed in the sense region 3 and separated from the surface electrode 5 .
- FIG. 2 is a cross-sectional view showing the main region of the semiconductor device according to Embodiment 1.
- FIG. An IGBT and a diode are formed in the main region 2 . Therefore, the semiconductor device according to this embodiment is an RC-IGBT.
- p-type base layer 10 is formed on n ⁇ -type drift layer 9 of semiconductor substrate 1 .
- An n + -type emitter layer 11 and a p + -type diffusion layer 12 are formed on the surface layer of the p-type base layer 10 .
- a trench 13 penetrating through the n + -type emitter layer 11 and the p-type base layer 10 is formed on the surface side of the semiconductor substrate 1 .
- a gate electrode 15 made of polysilicon or the like is formed inside the trench 13 with a gate oxide film 14 interposed therebetween.
- An interlayer insulating film 16 is formed on the gate electrode 15 .
- a p-type collector layer 17 is formed under the n ⁇ -type drift layer 9 .
- a p-type anode layer 18 is formed on the n ⁇ -type drift layer 9 in the diode.
- An n + -type cathode layer 19 is formed under the n ⁇ -type drift layer 9 .
- a surface electrode 5 is connected to the p-type base layer 10 , the n + -type emitter layer 11 , the p + -type diffusion layer 12 and the p-type anode layer 18 .
- a backside electrode 20 is formed on the backside of the semiconductor substrate 1 in the main region 2 and the sense region 3 and is connected to the p-type collector layer 17 and the n + -type cathode layer 19 .
- FIG. 3 is a cross-sectional view showing the sense region of the semiconductor device according to the first embodiment.
- a MOSFET is formed in the sense region 3 as a sense element.
- the MOSFET has a structure in which the p-type collector layer 17 of the IGBT in the main region 2 is replaced with an n + -type cathode layer 19 . That is, the IGBT has the p-type collector layer 17 on the back side of the semiconductor substrate 1 , but the MOSFET does not have the p-type collector layer 17 on the back side of the semiconductor substrate 1 . Therefore, the p-type collector layer 17 is not formed on the back side of the semiconductor substrate 1 in the sense region 3 .
- the n + -type emitter layer 11 serves as the source
- the n + -type cathode layer 19 serves as the drain.
- a gate electrode 15 of the MOSFET is connected to a gate electrode 15 of the IGBT.
- a current detection electrode 6 is connected to a p-type base layer 10, an n + -type emitter layer 11 and a p + -type diffusion layer 12 of the MOSFET.
- a backside electrode 20 is connected to the n + -type cathode layer 19 of the MOSFET.
- the configuration of the present disclosure can be applied to IGBTs that do not include diodes, but is particularly effective in RC-IGBTs.
- an n-type cathode layer is formed using a photomechanical technique. Therefore, when forming the n-type cathode layer of the diode in the main region, the n-type layer of the MOSFET in the sense region is formed. Thereby, the structure of this embodiment can be formed without adding a manufacturing process.
- the cross-sectional views disclosed in the present embodiment are merely examples, and the present disclosure is not limited to the illustrated structures.
- a diode with dummy trenches is illustrated, a diode without dummy trenches may be used.
- FIG. 4 is a cross-sectional view showing the main region of the semiconductor device according to the second embodiment.
- semiconductor substrate 1 has main region 2 and sense region 3 having a smaller operating area than main region 2 .
- a MOSFET is formed in the main region 2 .
- This MOSFET has a structure in which the p-type collector layer 17 of the IGBT in the main region 2 of the first embodiment is replaced with an n + -type cathode layer 19 .
- a surface electrode 5 is connected to a p-type base layer 10, an n + -type emitter layer 11 and a p + -type diffusion layer 12 of the MOSFET.
- a backside electrode 20 is connected to the n + -type cathode layer 19 of the MOSFET.
- FIG. 5 is a cross-sectional view showing the sense region of the semiconductor device according to the second embodiment.
- An IGBT is formed as a sense element in sense region 3 .
- This IGBT has the same structure as the IGBT of the main region 2 of the first embodiment.
- a gate electrode 15 of the IGBT in the sense region 3 is connected to a gate electrode 15 of the MOSFET in the main region 2 .
- a current detection electrode 6 is connected to a p-type base layer 10, an n + -type emitter layer 11 and a p + -type diffusion layer 12 of the IGBT.
- a current detection electrode 6 is formed in the sense region 3 and separated from the surface electrode 5 .
- a back electrode 20 is connected to the p-type collector layer 17 of the IGBT.
- the MOSFET is formed in the main region and the IGBT is formed in the sense region, the on-voltage is lower in the sense region than in the large current region. Therefore, it is possible to improve the detection sensitivity of the sense element by increasing the turn-on responsiveness in the large current region.
- the semiconductor substrate 1 is not limited to being made of silicon, and may be made of a wide bandgap semiconductor having a larger bandgap than silicon.
- Wide bandgap semiconductors are, for example, silicon carbide, gallium nitride-based materials, or diamond.
- a semiconductor device formed of such a wide bandgap semiconductor can be miniaturized because of its high withstand voltage and allowable current density.
- a semiconductor module incorporating this semiconductor device can also be miniaturized and highly integrated.
- the heat resistance of the semiconductor device is high, the radiation fins of the heat sink can be made smaller, and the water-cooled portion can be air-cooled, so that the semiconductor module can be further made smaller.
- the power loss of the semiconductor device is low and the efficiency is high, the efficiency of the semiconductor module can be improved.
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- Metal-Oxide And Bipolar Metal-Oxide Semiconductor Integrated Circuits (AREA)
Abstract
Description
図1は、実施の形態1に係る半導体装置を示す平面図である。半導体基板1は、メイン領域2と、メイン領域2よりも動作領域面積が小さいセンス領域3とを有する。ゲートパッド4、表面電極5及び電流検出用電極6が半導体基板1の表面に形成されている。表面電極5はメイン領域2に形成されている。電流検出用電極6はセンス領域3に形成され、表面電極5から分離されている。
図4は、実施の形態2に係る半導体装置のメイン領域を示す断面図である。実施の形態1と同様に、半導体基板1は、メイン領域2と、メイン領域2よりも動作領域面積が小さいセンス領域3とを有する。
Claims (5)
- メイン領域と、前記メイン領域よりも動作領域面積が小さいセンス領域とを有する半導体基板と、
前記メイン領域に形成されたIGBTと、
前記センス領域にセンス素子として形成され、前記IGBTのゲート電極と接続されたゲート電極を持つMOSFETと、
前記メイン領域において前記半導体基板の表面に形成された表面電極と、
前記メイン領域及び前記センス領域において前記半導体基板の裏面に形成された裏面電極と、
前記センス領域において前記表面に形成され、前記表面電極から分離された電流検出用電極とを備えることを特徴とする半導体装置。 - 前記メイン領域に形成されたダイオードを更に備えることを特徴とする請求項1に記載の半導体装置。
- メイン領域と、前記メイン領域よりも動作領域面積が小さいセンス領域とを有する半導体基板と、
前記メイン領域に形成されたMOSFETと、
前記センス領域にセンス素子として形成され、前記MOSFETのゲートと接続されたゲートを持つIGBTと、
前記メイン領域において前記半導体基板の表面に形成された表面電極と、
前記メイン領域及び前記センス領域において前記半導体基板の裏面に形成された裏面電極と、
前記センス領域において前記表面に形成され、前記表面電極から分離された電流検出用電極とを備えることを特徴とする半導体装置。 - 前記IGBTは前記半導体基板の裏面側にp型コレクタ層を有し、
前記MOSFETは前記半導体基板の裏面側にp型コレクタ層を有しないことを特徴とする請求項1~3の何れか1項に記載の半導体装置。 - 前記半導体基板はワイドバンドギャップ半導体によって形成されていることを特徴とする請求項1~4の何れか1項に記載の半導体装置。
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PCT/JP2021/004782 WO2022172328A1 (ja) | 2021-02-09 | 2021-02-09 | 半導体装置 |
JP2022581050A JP7521620B2 (ja) | 2021-02-09 | 2021-02-09 | 半導体装置 |
DE112021007052.5T DE112021007052B4 (de) | 2021-02-09 | 2021-02-09 | Halbleitervorrichtung |
US18/040,953 US20230268429A1 (en) | 2021-02-09 | 2021-02-09 | Semiconductor device |
CN202180093025.9A CN116830275A (zh) | 2021-02-09 | 2021-02-09 | 半导体装置 |
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JP7632142B2 (ja) | 2021-07-14 | 2025-02-19 | 株式会社デンソー | 半導体装置 |
Citations (3)
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JP2012199385A (ja) * | 2011-03-22 | 2012-10-18 | Toyota Motor Corp | 半導体装置と制御手段とを備えるシステム、及び、半導体装置を流れる電流の制御方法 |
JP2015164159A (ja) * | 2014-02-28 | 2015-09-10 | トヨタ自動車株式会社 | 半導体装置 |
JP2020170827A (ja) * | 2019-04-05 | 2020-10-15 | 株式会社デンソー | 半導体装置 |
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JP3243902B2 (ja) * | 1993-09-17 | 2002-01-07 | 株式会社日立製作所 | 半導体装置 |
JP3393932B2 (ja) | 1994-08-24 | 2003-04-07 | 株式会社東芝 | 絶縁ゲート型半導体装置 |
US5883402A (en) * | 1995-11-06 | 1999-03-16 | Kabushiki Kaisha Toshiba | Semiconductor device and protection method |
JP4506808B2 (ja) | 2007-10-15 | 2010-07-21 | 株式会社デンソー | 半導体装置 |
JP5332175B2 (ja) * | 2007-10-24 | 2013-11-06 | 富士電機株式会社 | 制御回路を備える半導体装置 |
JP5637175B2 (ja) | 2008-12-24 | 2014-12-10 | 株式会社デンソー | 半導体装置 |
JP5783997B2 (ja) * | 2012-12-28 | 2015-09-24 | 三菱電機株式会社 | 電力用半導体装置 |
JP6300316B2 (ja) * | 2013-07-10 | 2018-03-28 | ルネサスエレクトロニクス株式会社 | 半導体装置 |
JP6056984B2 (ja) | 2013-11-05 | 2017-01-11 | トヨタ自動車株式会社 | 半導体装置 |
JP6652173B2 (ja) | 2018-09-27 | 2020-02-19 | 株式会社デンソー | 半導体装置 |
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- 2021-02-09 CN CN202180093025.9A patent/CN116830275A/zh active Pending
- 2021-02-09 DE DE112021007052.5T patent/DE112021007052B4/de active Active
- 2021-02-09 JP JP2022581050A patent/JP7521620B2/ja active Active
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JP2012199385A (ja) * | 2011-03-22 | 2012-10-18 | Toyota Motor Corp | 半導体装置と制御手段とを備えるシステム、及び、半導体装置を流れる電流の制御方法 |
JP2015164159A (ja) * | 2014-02-28 | 2015-09-10 | トヨタ自動車株式会社 | 半導体装置 |
JP2020170827A (ja) * | 2019-04-05 | 2020-10-15 | 株式会社デンソー | 半導体装置 |
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JP7632142B2 (ja) | 2021-07-14 | 2025-02-19 | 株式会社デンソー | 半導体装置 |
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US20230268429A1 (en) | 2023-08-24 |
DE112021007052T5 (de) | 2023-12-28 |
JPWO2022172328A1 (ja) | 2022-08-18 |
DE112021007052B4 (de) | 2024-10-02 |
JP7521620B2 (ja) | 2024-07-24 |
CN116830275A (zh) | 2023-09-29 |
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