JP5637093B2 - 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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- JP5637093B2 JP5637093B2 JP2011171565A JP2011171565A JP5637093B2 JP 5637093 B2 JP5637093 B2 JP 5637093B2 JP 2011171565 A JP2011171565 A JP 2011171565A JP 2011171565 A JP2011171565 A JP 2011171565A JP 5637093 B2 JP5637093 B2 JP 5637093B2
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims description 68
- 229910010271 silicon carbide Inorganic materials 0.000 title claims description 67
- 239000004065 semiconductor Substances 0.000 title claims description 55
- 239000012535 impurity Substances 0.000 claims description 71
- 239000000758 substrate Substances 0.000 claims description 63
- 239000010410 layer Substances 0.000 description 115
- 239000011229 interlayer Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 239000012212 insulator Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000059 patterning Methods 0.000 description 2
- 238000005468 ion implantation Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
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Description
(実施の形態1)
図1に示すように、本実施の形態のパワーモジュール(炭化珪素半導体装置)51は、エピタキシャル基板30と、第1電極S1と、第2電極D1と、第3電極G1と、ショットキー電極SKと、層間絶縁膜I1とを有する。エピタキシャル基板30はSiCから作られており、単結晶基板31と、バッファ層32と、下部p層33(第3層)と、n層34(第1層)と、上部p層35(第2層)とを有する。バッファ層32は単結晶基板31上に設けられている。下部p層33はバッファ層32上に設けられている。n層34は下部p層33上に設けられている。上部p層35はn層34上に設けられている。よって厚さ方向において上部p層35と下部p層33とがn層34を挟んでいる。n層34はn型(第1導電型)を有する。上部p層35は、n層34の一部が露出されるようにn層34上に設けられている。上部p層35および下部p層33の各々はp型(第1導電型と異なる第2導電型)を有する。
本実施の形態においては、特に、第1〜第3電極S1、D1、G1、およびショットキー電極SKの平面レイアウトについて説明する。
図4および図5に示すように、本実施の形態のパワーモジュール(炭化珪素半導体装置)52はユニット(素子)51aおよび51bを有する。ユニット51aおよび51bの各々は、上述した実施の形態1(図1)または実施の形態2(図3)のパワーモジュール51とほぼ同様の構成を有する。ユニット51aおよび51bは、一のエピタキシャル基板30を共有している。エピタキシャル基板30の上面側には、ユニット51aおよび51bの各々を囲む溝部39が設けられている。溝部39は、上部p層35およびn層34を貫通している。これによりn層34は、溝部39によって互いに電気的に分離された領域R1(第1領域)および領域R2(第2領域)を有する。領域R1およびR2のそれぞれは、ユニット51aおよび51bを構成している。
図7に示すように、本実施の形態のパワーモジュール(炭化珪素半導体装置)53は、エピタキシャル基板(炭化珪素基板)30と、第1電極S1と、第2電極D1と、第3電極G1と、第4電極S2と、第5電極D2と、第6電極G2と、層間絶縁膜I1と、ゲート酸化膜I2(ゲート絶縁膜)と、ショットキー電極SKとを有する。
図9に示すように、エピタキシャル基板30が形成される。具体的には、単結晶基板31上に、バッファ層32、下部p層33、n層34、および上部p層35がこの順にエピタキシャル成長によって形成される。エピタキシャル成長は、たとえばCVD(Chemical Vapor Deposition)法によって行うことができる。
なお、上記以外の構成については、上述した実施の形態1〜3のいずれかの構成とほぼ同じであるため、同一または対応する要素について同一の符号を付し、その説明を繰り返さない。
本実施の形態においては、第1〜第6電極S1、D1、G1、S2、D2およびG2と、ショットキー電極SKとの平面レイアウトについて特に説明する。
図15に示すように、本実施の形態のパワーモジュール(炭化珪素半導体装置)54においては、エピタキシャル基板30は第6不純物領域14を有する。第6不純物領域14は、露出されたn層34を貫通して下部p層33に達しており、p型を有する。また第1電極S1は、第6不純物領域14に電気的に接続されており、本実施の形態においては第6不純物領域14に接している。この構成により、第1電極S1と、下部p層33とが、p型の第6不純物領域を介して電気的に接続されている。
Claims (7)
- 炭化珪素半導体装置であって、
第1導電型を有する第1層と、前記第1層の一部が露出されるように前記第1層上に設けられ、前記第1導電型と異なる第2導電型を有する第2層とを含む炭化珪素基板を備え、
前記炭化珪素基板は前記第2層を貫通して前記第1層に達する第1〜第3不純物領域を有し、前記第1および第2不純物領域の各々は前記第1導電型を有し、前記第3不純物領域は前記第1および第2不純物領域の間に配置されかつ前記第2導電型を有し、前記炭化珪素半導体装置はさらに
前記第1〜第3不純物領域のそれぞれの上に設けられた第1〜第3電極と、
前記第1層の一部の上に設けられ、前記第1電極に電気的に接続されたショットキー電極とを備える、炭化珪素半導体装置。 - 前記第1導電型はn型である、請求項1に記載の炭化珪素半導体装置。
- 前記第1〜第3電極の各々はオーミック電極である、請求項1または2に記載の炭化珪素半導体装置。
- 前記炭化珪素基板は、前記第2層との間に前記第1層を挟みかつ前記第2導電型を有しかつ前記第1電極と電気的に接続された第3層を含む、請求項1〜3のいずれか1項に記載の炭化珪素半導体装置。
- 前記ショットキー電極は前記第1電極に接触している、請求項1〜4のいずれか1項に記載の炭化珪素半導体装置。
- 前記第1層は、
前記第1〜第3不純物領域、前記第1〜第3電極、および前記ショットキー電極が設けられた第1領域と、
前記第1領域から電気的に分離された第2領域とを有する、請求項1〜5のいずれか1項に記載の炭化珪素半導体装置。 - 炭化珪素半導体装置であって、
第1導電型を有する第1層と、前記第1層の一部が露出されるように前記第1層上に設けられ、前記第1導電型と異なる第2導電型を有する第2層とを含む炭化珪素基板を備え、
前記炭化珪素基板は第1〜第5不純物領域を有し、前記第1、第2、第4および第5不純物領域の各々は前記第1導電型を有し前記第3不純物領域は前記第2導電型を有し、前記第1〜第3不純物領域の各々は前記第2層を貫通して前記第1層に達しており前記第3不純物領域は前記第1および第2不純物領域の間に配置されており前記第4および第5不純物領域の各々は前記第2層上に設けられており、前記炭化珪素半導体装置はさらに
前記第1〜第5不純物領域のそれぞれの上に設けられた第1〜第5電極を備え、
前記第1および第5電極は互いに電気的に接続されており、前記第3および前記第4電極は互いに電気的に接続されており、前記炭化珪素半導体装置はさらに
前記第2層上において前記第4および第5不純物領域の間を覆うゲート絶縁膜と、
前記ゲート絶縁膜上に設けられた第6電極と、
前記第1層の一部の上に設けられ、前記第4電極に電気的に接続されたショットキー電極とを備える、炭化珪素半導体装置。
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Application Number | Priority Date | Filing Date | Title |
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JP2011171565A JP5637093B2 (ja) | 2011-08-05 | 2011-08-05 | 炭化珪素半導体装置 |
PCT/JP2012/064989 WO2013021722A1 (ja) | 2011-08-05 | 2012-06-12 | 炭化珪素半導体装置 |
DE112012003258.6T DE112012003258T5 (de) | 2011-08-05 | 2012-06-12 | Siliciumcarbid-Halbleiterbauelement |
CN201280032325.7A CN103620780A (zh) | 2011-08-05 | 2012-06-12 | 碳化硅半导体器件 |
US13/565,209 US20130032823A1 (en) | 2011-08-05 | 2012-08-02 | Silicon carbide semiconductor device |
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JP2011171565A JP5637093B2 (ja) | 2011-08-05 | 2011-08-05 | 炭化珪素半導体装置 |
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JP5637093B2 true JP5637093B2 (ja) | 2014-12-10 |
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WO2014103126A1 (ja) * | 2012-12-26 | 2014-07-03 | パナソニック株式会社 | サージ保護素子及び半導体装置 |
JP6244763B2 (ja) * | 2013-09-12 | 2017-12-13 | 住友電気工業株式会社 | 炭化珪素半導体装置 |
US10583615B2 (en) * | 2014-06-30 | 2020-03-10 | Cytec Industries Inc. | Dry fibrous tape for manufacturing preform |
JP7000912B2 (ja) * | 2018-02-22 | 2022-01-19 | 株式会社豊田中央研究所 | 半導体装置 |
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JPH0833781A (ja) * | 1994-07-22 | 1996-02-06 | Kaijirushi Hamono Kaihatsu Center:Kk | 安全かみそりの替刃 |
JP2006100645A (ja) * | 2004-09-30 | 2006-04-13 | Furukawa Electric Co Ltd:The | GaN系半導体集積回路 |
US8154073B2 (en) * | 2006-07-14 | 2012-04-10 | Denso Corporation | Semiconductor device |
JP4599379B2 (ja) * | 2007-08-31 | 2010-12-15 | 株式会社東芝 | トレンチゲート型半導体装置 |
JP2009259963A (ja) * | 2008-04-15 | 2009-11-05 | Sumitomo Electric Ind Ltd | 半導体装置 |
EP2280417B1 (en) * | 2008-04-15 | 2015-07-22 | Sumitomo Electric Industries, Ltd. | Semiconductor device and method for manufacturing the same |
-
2011
- 2011-08-05 JP JP2011171565A patent/JP5637093B2/ja not_active Expired - Fee Related
-
2012
- 2012-06-12 DE DE112012003258.6T patent/DE112012003258T5/de not_active Withdrawn
- 2012-06-12 WO PCT/JP2012/064989 patent/WO2013021722A1/ja active Application Filing
- 2012-06-12 CN CN201280032325.7A patent/CN103620780A/zh active Pending
- 2012-08-02 US US13/565,209 patent/US20130032823A1/en not_active Abandoned
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US20130032823A1 (en) | 2013-02-07 |
JP2013038150A (ja) | 2013-02-21 |
DE112012003258T5 (de) | 2014-05-15 |
CN103620780A (zh) | 2014-03-05 |
WO2013021722A1 (ja) | 2013-02-14 |
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