JP6267102B2 - 半導体装置および半導体装置の製造方法 - Google Patents
半導体装置および半導体装置の製造方法 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims description 128
- 238000004519 manufacturing process Methods 0.000 title claims description 21
- 238000002955 isolation Methods 0.000 claims description 89
- 239000000463 material Substances 0.000 claims description 87
- 239000000758 substrate Substances 0.000 claims description 69
- 239000011248 coating agent Substances 0.000 claims description 32
- 238000000576 coating method Methods 0.000 claims description 32
- 238000005530 etching Methods 0.000 claims description 24
- 238000000151 deposition Methods 0.000 claims description 18
- 230000002093 peripheral effect Effects 0.000 description 13
- 238000007667 floating Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 239000012535 impurity Substances 0.000 description 8
- 230000015556 catabolic process Effects 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000011229 interlayer Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 3
- 229920005591 polysilicon Polymers 0.000 description 3
- 229910052814 silicon oxide Inorganic materials 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 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
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 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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Description
以下、実施例について添付図面を参照して説明する。図1に示すように、第1実施例に係る半導体装置1は、矩形状の半導体基板2を備えている。半導体基板2は、炭化ケイ素(SiC)により形成されている。他の例では、半導体基板2は、シリコン(Si)や窒化ガリウム(GaN)等により形成されていてもよい。半導体基板2の内部には、半導体素子が形成されている。
上記の実施例では、ベース領域62が、「第1領域」の一例であり、第1部分10に最も近いフィールドリミティングリング80aが、「第2領域」の一例であり、ドリフト領域65が、「第3領域」の一例である。
第2実施例では、図12に示すように、角部40に近接する範囲Aにおける分離絶縁膜32の厚みが、角部40から離反した範囲Bにおける分離絶縁膜32の厚みより厚い。この場合、角部材50は、角部40側に、凹状の湾曲面54を備えている。湾曲面54は、角部40における分離絶縁膜32を覆っている。この半導体装置1を製造するときは、図13に示すように、分離絶縁膜材料301をエッチングするときに、角部40に近接する範囲Aに残存する分離絶縁膜材料301が角部40から離反した範囲Bに残存する分離絶縁膜材料301より多くなるようにエッチングする。例えば、エッチングレートを調整することにより、分離絶縁膜材料301が角部40に多く残存する結果を得ることができる。通常のエッチング手法によると、分離絶縁膜材料301をエッチングしたときに、自然に角部40に近接する範囲Aに分離絶縁膜材料301が多く残存する結果となる。
第3実施例では、図14に示すように、角部材50の上面51が、階段状に形成されている。角部材50の上面51には、複数の段差がある。これにより、角部材50の上面51は、段差部90の側面92より第2部分20側に向かうにしたがって段階的に下方に下がってゆく。
第4実施例では、図15に示すように、角部材50の上面51が、斜面として形成されている。これにより、角部材50の上面51は、段差部90の側面92より第2部分20側に向かうにしたがって連続的に下方に下がってゆく。
第5実施例では、図16に示すように、角部材50が延在部55を備えていてもよい。延在部55は、段差部90の側面92および上面11に沿って延びている。延在部55を備えることにより、角部材50の上面51の一部が、第1部分10の上面11よりも上方に位置していている。したがって、角部材50の上面51には、段差部90の側面92より第2部分20側に向かうにしたがって段階的に下方に下がってゆく部分と、連続的に下方に下がってゆく部分がある。延在部55は、被覆絶縁膜31に覆われている。延在部55は、分離絶縁膜32を介して、第1部分10に形成されたベース領域62に対向している。延在部55は、は表面電極6に接続されていてもよい(図示省略)。
2 :半導体基板
3 :素子領域
4 :周辺領域
6 :表面電極
7 :裏面電極
10 :第1部分
20 :第2部分
31 :被覆絶縁膜
32 :分離絶縁膜
40 :角部
50 :角部材
51 :上面
54 :湾曲面
55 :延在部
61 :ソース領域
62 :ベース領域
63 :ドレイン領域
65 :ドリフト領域
67 :フローティング領域
70 :トレンチ
71 :ゲート絶縁膜
72 :ゲート電極
73 :層間絶縁膜
80 :フィールドリミティングリング
82 :周辺ドリフト領域
90 :段差部
121 :ベースコンタクト領域
122 :低濃度ベース領域
301 :分離絶縁膜材料
302 :角部材材料
303 :被覆絶縁膜材料
Claims (8)
- 半導体素子が形成された半導体基板と、
前記半導体基板の上に形成された被覆絶縁膜とを備え、
前記半導体基板は、第1部分と、前記第1部分より厚みが薄い第2部分とを備え、前記第1部分と前記第2部分が隣り合う部分に段差部が形成されており、
前記段差部の側面と前記第2部分の上面との間の角部に角部材が形成されており、
前記角部材の上面が、前記段差部の側面より前記第2部分側に向かうにしたがって下方に下がっており、
前記被覆絶縁膜が、前記第1部分から前記第2部分に亘って延びており、前記角部材を覆っており、
前記半導体基板と前記角部材の間に形成された分離絶縁膜を更に備え、
前記角部材が導電性を有しており、
前記角部に近接した範囲の前記分離絶縁膜の厚みが、前記角部から離反した範囲の前記分離絶縁膜の厚みより厚い、半導体装置。 - 前記角部材の前記上面が、前記第1部分の上面より下方に位置している、請求項1に記載の半導体装置。
- 前記角部材の前記上面が、上方に凸に湾曲している、請求項1または2に記載の半導体装置。
- 前記半導体基板は、前記段差部の側面に露出する第1導電型の第1領域と、前記第2部
分の上面に露出する第1導電型の第2領域と、前記第1領域と前記第2領域の間に形成された第2導電型の第3領域とを備え、
前記角部材は、前記分離絶縁膜を介して、少なくとも前記第1領域および前記第2領域の双方に対向している、請求項1から3のいずれか一項に記載の半導体装置。 - 前記第1部分にはトレンチが形成されており、
前記トレンチの内部にゲート電極が配置されており、
前記角部材と前記ゲート電極が同じ材料により形成されている、請求項1から4のいずれかの一項に記載の半導体装置。 - 第1部分と、前記第1部分より厚みが薄い第2部分と、前記第1部分と前記第2部分が隣り合う部分に形成されている段差部とを備えている半導体基板と、
前記半導体基板の上に形成された被覆絶縁膜とを備えている半導体装置の製造方法であり、
前記半導体基板の上面に分離絶縁膜を形成する工程と、
前記段差部の側面と前記第2部分の上面との間の角部に、上面が前記段差部の側面より前記第2部分側に向かうにしたがって下方に下がる角部材を形成する工程と、
前記半導体基板の前記第1部分から前記第2部分に亘って延びる被覆絶縁膜を形成し、前記被覆絶縁膜によって前記角部材を覆う工程とを備え、
前記角部材を形成する工程では、前記分離絶縁膜の上に導電性を有する角部材を形成し、
前記分離絶縁膜を形成する工程が、
前記半導体基板の上面に分離絶縁膜材料を堆積する工程と、
前記角部に近接した範囲の前記分離絶縁膜の厚みが、前記角部から離反した範囲の前記分離絶縁膜の厚みより厚くなるように前記分離絶縁膜材料をエッチングする工程とを備える半導体装置の製造方法。 - 前記角部材を形成する工程が、
前記半導体基板の上に角部材材料を堆積する工程と、
堆積した前記角部材材料をエッチングする工程とを備え、
前記角部材材料をエッチングする工程で、前記角部に前記角部材材料を残存させることによって前記角部材が形成される、請求項6に記載の半導体装置の製造方法。 - 第1部分にトレンチが形成されている半導体装置の製造方法であり、
前記分離絶縁膜を形成する工程が、前記半導体基板の上面に分離絶縁膜材料を堆積する工程と、堆積した前記分離絶縁膜材料をエッチングする工程とを備え、
前記角部材を形成する工程が、前記分離絶縁膜の上面に角部材材料を堆積する工程と、堆積した前記角部材材料をエッチングする工程とを備え、
前記分離絶縁膜材料を堆積する工程で、前記トレンチの内面に前記分離絶縁膜材料が堆積し、
前記分離絶縁膜材料をエッチングする工程で、前記トレンチの内面に前記分離絶縁膜材料が残存することによりゲート絶縁膜が形成され、
前記角部材材料を堆積する工程で、前記トレンチの内部に前記角部材材料が堆積し、
前記角部材材料をエッチングする工程で、前記トレンチの内部に前記角部材材料が残存することによりゲート電極が形成される、請求項6または7に記載の半導体装置の製
造方法。
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US15/517,231 US20170309716A1 (en) | 2014-12-10 | 2015-07-22 | Seminconductor device and manufacturing method of the same |
PCT/JP2015/070890 WO2016092895A1 (ja) | 2014-12-10 | 2015-07-22 | 半導体装置および半導体装置の製造方法 |
DE112015005588.6T DE112015005588B4 (de) | 2014-12-10 | 2015-07-22 | Halbleitervorrichtung und herstellungsverfahren derselben |
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US5072266A (en) * | 1988-12-27 | 1991-12-10 | Siliconix Incorporated | Trench DMOS power transistor with field-shaping body profile and three-dimensional geometry |
US5126807A (en) * | 1990-06-13 | 1992-06-30 | Kabushiki Kaisha Toshiba | Vertical MOS transistor and its production method |
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US6737716B1 (en) * | 1999-01-29 | 2004-05-18 | Kabushiki Kaisha Toshiba | Semiconductor device and method of manufacturing the same |
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US6309929B1 (en) * | 2000-09-22 | 2001-10-30 | Industrial Technology Research Institute And Genetal Semiconductor Of Taiwan, Ltd. | Method of forming trench MOS device and termination structure |
JP4011848B2 (ja) * | 2000-12-12 | 2007-11-21 | 関西電力株式会社 | 高耐電圧半導体装置 |
US7652326B2 (en) * | 2003-05-20 | 2010-01-26 | Fairchild Semiconductor Corporation | Power semiconductor devices and methods of manufacture |
JP4232645B2 (ja) * | 2004-01-29 | 2009-03-04 | 富士電機デバイステクノロジー株式会社 | トレンチ横型半導体装置およびその製造方法 |
US8105903B2 (en) * | 2009-09-21 | 2012-01-31 | Force Mos Technology Co., Ltd. | Method for making a trench MOSFET with shallow trench structures |
JP5691259B2 (ja) | 2010-06-22 | 2015-04-01 | 株式会社デンソー | 半導体装置 |
US8722503B2 (en) * | 2010-07-16 | 2014-05-13 | Texas Instruments Incorporated | Capacitors and methods of forming |
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