JP7389239B2 - トレンチゲート型SiCMOSFETデバイス及びその製造方法 - Google Patents
トレンチゲート型SiCMOSFETデバイス及びその製造方法 Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims description 18
- 239000010410 layer Substances 0.000 claims description 96
- 239000000758 substrate Substances 0.000 claims description 50
- 238000000034 method Methods 0.000 claims description 38
- 238000010438 heat treatment Methods 0.000 claims description 30
- 230000008569 process Effects 0.000 claims description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 16
- 230000003647 oxidation Effects 0.000 claims description 16
- 238000007254 oxidation reaction Methods 0.000 claims description 16
- 229910052799 carbon Inorganic materials 0.000 claims description 15
- 239000011229 interlayer Substances 0.000 claims description 14
- 150000001722 carbon compounds Chemical class 0.000 claims description 10
- 150000002500 ions Chemical class 0.000 claims description 5
- 238000005530 etching Methods 0.000 claims description 4
- 238000000059 patterning Methods 0.000 claims description 3
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims 1
- 238000009413 insulation Methods 0.000 claims 1
- 230000015556 catabolic process Effects 0.000 description 9
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 238000009616 inductively coupled plasma Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 238000004518 low pressure chemical vapour deposition Methods 0.000 description 2
- 238000000623 plasma-assisted chemical vapour deposition Methods 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 238000004627 transmission electron microscopy Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
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- 229910021386 carbon form Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 229910052757 nitrogen Inorganic materials 0.000 description 1
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- 239000004065 semiconductor Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
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- H01L29/42356—Disposition, e.g. buried gate electrode
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Description
Claims (9)
- ソース領域のためのドーピング層を有するSiC基板を前記ソース領域のドーピング層よりも深くエッチングしてゲートトレンチを形成する段階と、
前記ゲートトレンチの底面にドープされたウェルを形成するためにイオン注入する段階
と、
熱処理する段階と、
800~1200℃で30~50分間乾式酸化を行うSOP(Sacrificial
Oxidation Process)工程を行う段階と、 ゲート酸化膜を形成する段階と、
前記ゲートトレンチ内にゲート電極を形成する段階と、
前記ゲート電極が形成された基板上に層間絶縁膜を形成する段階と、
前記ゲート酸化膜及び層間絶縁膜をパターニングする段階と、
前記基板のエピタキシャル層の前面に形成されたソース領域のためのドーピング層の上面と前記層間絶縁膜の上面を覆うソース電極を形成する段階と、及び
前記基板の背面にドレイン電極を形成する段階と、を含み、
H 2 雰囲気で前記熱処理によってSiC界面で発生した炭素化合物を、前記SOP工程で酸化又は除去することを特徴とする、トレンチゲート型SiC MOSFETデバイスの製造方法。 - 前記熱処理する段階は、H2雰囲気で熱処理することを特徴とする、請求項1に記載のトレンチゲート型SiC MOSFETデバイスの製造方法。
- 前記熱処理する段階前に、
トレンチ構造の前記基板上に炭素キャッピング層を形成し、Ar雰囲気で熱処理後に炭素キャッピング層を除去する段階をさらに含むことを特徴とする、請求項1に記載のトレンチゲート型SiC MOSFETデバイスの製造方法。 - 前記炭素化合物は、前記トレンチゲート型SiC MOSFETデバイスにおいて漏洩界面層(leaky interfacial layer)を形成して逆方向の漏洩電流を発生させ、前記SOP工程で前記逆方向の漏洩電流を減少させることを特徴とする、請求項1に記載のトレンチゲート型SiC MOSFETデバイスの製造方法。
- 前記炭素化合物は、黒鉛質炭素層を含むことを特徴とする、請求項1に記載のトレンチゲート型SiC MOSFETデバイスの製造方法。
- 前記ゲート電極を形成する段階前に、
前記ゲート酸化膜の形成のためTEOS酸化膜を形成し、NO雰囲気で熱処理する段階をさらに含むことを特徴とする、請求項1に記載のトレンチゲート型SiC MOSFETデバイスの製造方法。 - 前記基板は、4H-SiC基板であることを特徴とする、請求項1に記載のトレンチゲート型SiC MOSFETデバイスの製造方法。
- 前記基板のエピタキシャル層の前面に形成された前記ソース領域の前記ドーピング層は、前記ゲート電極の左右にドーピング層を含むことを特徴とする、請求項1に記載のトレンチゲート型SiC MOSFETデバイスの製造方法。
- 前記基板がn型エピタキシャル層を有する基板である場合、前記ソース領域のドーピン
グ層は、前記ゲート電極の左右に、p-ベース層上にn+層とp+層が横並びに隣接している層を含むことを特徴とする、請求項1に記載のトレンチゲート型SiC MOSFETデバイスの製造方法。
Applications Claiming Priority (5)
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KR10-2019-0112452 | 2019-09-10 | ||
KR20190112452 | 2019-09-10 | ||
KR10-2020-0069145 | 2020-06-08 | ||
KR1020200069145A KR102330787B1 (ko) | 2019-09-10 | 2020-06-08 | 트렌치 게이트형 SiC MOSFET 디바이스 및 그 제조 방법 |
PCT/KR2020/011654 WO2021049801A1 (ko) | 2019-09-10 | 2020-08-31 | 트렌치 게이트형 SiC MOSFET 디바이스 및 그 제조 방법 |
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JP6310571B2 (ja) * | 2014-11-18 | 2018-04-11 | 東洋炭素株式会社 | SiC基板処理方法 |
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JP2012064658A (ja) | 2010-09-14 | 2012-03-29 | Denso Corp | 炭化珪素半導体装置およびその製造方法 |
JP2013214658A (ja) | 2012-04-03 | 2013-10-17 | Denso Corp | 炭化珪素半導体装置およびその製造方法 |
WO2014115253A1 (ja) | 2013-01-23 | 2014-07-31 | 株式会社日立製作所 | 炭化珪素半導体装置及びその製造方法 |
WO2015146162A1 (ja) | 2014-03-24 | 2015-10-01 | キヤノンアネルバ株式会社 | 半導体基板の熱処理方法及び熱処理装置 |
JP2018060924A (ja) | 2016-10-05 | 2018-04-12 | 富士電機株式会社 | 半導体装置および半導体装置の製造方法 |
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