JP2011044513A - 炭化珪素半導体装置 - Google Patents
炭化珪素半導体装置 Download PDFInfo
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- JP2011044513A JP2011044513A JP2009190576A JP2009190576A JP2011044513A JP 2011044513 A JP2011044513 A JP 2011044513A JP 2009190576 A JP2009190576 A JP 2009190576A JP 2009190576 A JP2009190576 A JP 2009190576A JP 2011044513 A JP2011044513 A JP 2011044513A
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- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 48
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 239000004065 semiconductor Substances 0.000 title description 10
- 239000010410 layer Substances 0.000 claims abstract description 50
- 210000000746 body region Anatomy 0.000 claims abstract description 23
- 239000000758 substrate Substances 0.000 claims abstract description 22
- 239000002344 surface layer Substances 0.000 claims abstract description 5
- 230000015556 catabolic process Effects 0.000 description 13
- 230000005684 electric field Effects 0.000 description 11
- 230000000903 blocking effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000012212 insulator Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000779 depleting effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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- 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
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
- H01L29/7813—Vertical DMOS transistors, i.e. VDMOS transistors with trench gate electrode, e.g. UMOS transistors
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- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
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- H01L29/417—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions carrying the current to be rectified, amplified or switched
- H01L29/41725—Source or drain electrodes for field effect devices
- H01L29/41741—Source or drain electrodes for field effect devices for vertical or pseudo-vertical devices
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- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
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- H01L29/417—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions carrying the current to be rectified, amplified or switched
- H01L29/41725—Source or drain electrodes for field effect devices
- H01L29/41766—Source or drain electrodes for field effect devices with at least part of the source or drain electrode having contact below the semiconductor surface, e.g. the source or drain electrode formed at least partially in a groove or with inclusions of conductor inside the semiconductor
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66053—Multistep manufacturing processes of devices having a semiconductor body comprising crystalline silicon carbide
- H01L29/66068—Multistep manufacturing processes of devices having a semiconductor body comprising crystalline silicon carbide the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
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- H01L29/0692—Surface layout
- H01L29/0696—Surface layout of cellular field-effect devices, e.g. multicellular DMOS transistors or IGBTs
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- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
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- H01L29/42316—Gate electrodes for field effect devices for field-effect transistors
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- H01L29/42372—Gate electrodes for field effect devices for field-effect transistors with insulated gate characterised by the conducting layer, e.g. the length, the sectional shape or the lay-out
- H01L29/4238—Gate electrodes for field effect devices for field-effect transistors with insulated gate characterised by the conducting layer, e.g. the length, the sectional shape or the lay-out characterised by the surface lay-out
Abstract
【解決手段】本発明は、n+型炭化珪素基板上に、n-型ドリフト層とp型ベース領域を積層すると共に、ベース領域内の表層部における所定領域にn+型ソース領域を形成し、かつ、前記ドリフト層に達するトレンチ溝によりゲートトレンチを形成する。前記ゲートトレンチと隣接しかつ接触せずにp型ボディー領域が、前記ゲートトレンチよりも深い位置に形成され、かつ、上面からみたときにこのp型ボディー領域を中心として、前記ゲートトレンチが六角形の形を有して取り囲んでおり、前記ゲートトレンチの側面は炭化珪素の{11-20}面のみにより構成されている。
【選択図】図1
Description
本発明は、係る問題点を解決して、ゲートトレンチと隣接しかつ接触せずに形成したボディー領域(p型領域)を取り囲むように、ゲートトレンチを配置することにより、このボディー領域の面積を最小限にし、かつ、ボディー領域から延びる空乏層により効率よくトレンチ底のゲート酸化膜を保護することを目的としている。
A:第1トレンチ無しでストライプセル、
B:第1トレンチ無しで六角セル、
C:第1トレンチ有りでストライプセル、
D:第1トレンチ有りで六角セル(本発明)となっている。
2:n-型ドリフト層
3:p型ベース層
4:n+型ソース領域
5:第1トレンチ溝
6:p型ボディー領域
7:第2トレンチ溝
8:ゲート酸化膜
9:ゲート電極
10:層間絶縁膜
11:ソース電極
12:ドレイン電極
Claims (6)
- 炭化珪素基板上に、第1の導電型のドリフト層と第2の導電型のベース領域を積層すると共に、ベース領域内の表層部における所定領域に第1の導電型のソース領域を形成し、かつ、前記ドリフト層に達するトレンチ溝によりゲートトレンチを形成した炭化珪素トレンチ型MOSFETにおいて、
前記ゲートトレンチと隣接しかつ接触せずに第2の導電型のボディー領域が、前記ゲートトレンチよりも深い位置に形成され、かつ、上面からみたときに第2の導電型の前記ボディー領域を中心として、前記ゲートトレンチが六角形の形を有して取り囲んでおり、前記ゲートトレンチの側面は炭化珪素の{11-20}面のみにより構成されていることを特徴とする炭化珪素トレンチ型MOSFET。 - 前記炭化珪素基板は、n+型であり、前記ドリフト層は、n-型であり、前記ベース領域は、p型であり、前記ソース領域は、n+型であり、かつ、前記ボディー領域は、p型である請求項1に記載の炭化珪素トレンチ型MOSFET。
- 前記ボディー領域は、前記ゲートトレンチのトレンチ溝とは別のトレンチ溝の底に形成したp型領域により構成される請求項1に記載の炭化珪素トレンチ型MOSFET。
- 前記ゲートトレンチは、前記トレンチ溝の側面および底面に形成したゲート酸化膜とこのトレンチ溝を埋めるように形成したゲート電極により構成される請求項1に記載の炭化珪素トレンチ型MOSFET。
- 前記炭化珪素基板はC面より構成される請求項1に記載の炭化珪素トレンチ型MOSFET。
- 前記炭化珪素基板は(000-1)面からの傾斜が1度以下である請求項1ないし5のいずれかに記載の炭化珪素トレンチ型MOSFET。
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JP2009190576A JP2011044513A (ja) | 2009-08-20 | 2009-08-20 | 炭化珪素半導体装置 |
US12/926,166 US20110121316A1 (en) | 2009-08-20 | 2010-10-29 | Silicon carbide semiconductor device |
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JP2009190576A JP2011044513A (ja) | 2009-08-20 | 2009-08-20 | 炭化珪素半導体装置 |
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JP2011044513A true JP2011044513A (ja) | 2011-03-03 |
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Cited By (12)
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WO2013038860A1 (ja) * | 2011-09-14 | 2013-03-21 | 住友電気工業株式会社 | 炭化珪素半導体装置およびその製造方法 |
WO2013038862A1 (ja) * | 2011-09-14 | 2013-03-21 | 住友電気工業株式会社 | 炭化珪素半導体装置の製造方法 |
US8981384B2 (en) | 2010-08-03 | 2015-03-17 | Sumitomo Electric Industries, Ltd. | Semiconductor device and method for manufacturing same |
US9000447B2 (en) | 2011-09-26 | 2015-04-07 | Sumitomo Electric Industries, Ltd. | Silicon carbide semiconductor device |
US8999854B2 (en) | 2011-11-21 | 2015-04-07 | Sumitomo Electric Industries, Ltd. | Method for manufacturing silicon carbide semiconductor device |
JP2015099845A (ja) * | 2013-11-19 | 2015-05-28 | 住友電気工業株式会社 | 半導体装置 |
JP2015228513A (ja) * | 2011-02-02 | 2015-12-17 | ローム株式会社 | 半導体装置およびその製造方法 |
US9349856B2 (en) | 2013-03-26 | 2016-05-24 | Toyoda Gosei Co., Ltd. | Semiconductor device including first interface and second interface as an upper surface of a convex protruded from first interface and manufacturing device thereof |
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JP6064366B2 (ja) * | 2012-05-18 | 2017-01-25 | 住友電気工業株式会社 | 半導体装置 |
US20150171169A1 (en) * | 2012-05-31 | 2015-06-18 | National Institute Of Advanced Industrial Science And Technology | Semiconductor device |
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Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
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US8981384B2 (en) | 2010-08-03 | 2015-03-17 | Sumitomo Electric Industries, Ltd. | Semiconductor device and method for manufacturing same |
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