JP4304034B2 - 超接合半導体素子の製造方法 - Google Patents
超接合半導体素子の製造方法 Download PDFInfo
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- JP4304034B2 JP4304034B2 JP2003338850A JP2003338850A JP4304034B2 JP 4304034 B2 JP4304034 B2 JP 4304034B2 JP 2003338850 A JP2003338850 A JP 2003338850A JP 2003338850 A JP2003338850 A JP 2003338850A JP 4304034 B2 JP4304034 B2 JP 4304034B2
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- 239000004065 semiconductor Substances 0.000 title claims description 112
- 238000004519 manufacturing process Methods 0.000 title claims description 52
- 239000000758 substrate Substances 0.000 claims description 58
- 238000000034 method Methods 0.000 claims description 23
- 230000007423 decrease Effects 0.000 claims description 10
- 238000001947 vapour-phase growth Methods 0.000 claims description 10
- 239000000460 chlorine Substances 0.000 claims description 9
- 238000004518 low pressure chemical vapour deposition Methods 0.000 claims description 8
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 7
- 229910052801 chlorine Inorganic materials 0.000 claims description 7
- 239000000463 material Substances 0.000 description 21
- 239000013078 crystal Substances 0.000 description 16
- 238000005530 etching Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 239000010703 silicon Substances 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000001020 plasma etching Methods 0.000 description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 230000006911 nucleation Effects 0.000 description 3
- 238000010899 nucleation Methods 0.000 description 3
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- MROCJMGDEKINLD-UHFFFAOYSA-N dichlorosilane Chemical compound Cl[SiH2]Cl MROCJMGDEKINLD-UHFFFAOYSA-N 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- PZPGRFITIJYNEJ-UHFFFAOYSA-N disilane Chemical compound [SiH3][SiH3] PZPGRFITIJYNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M potassium hydroxide Substances [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- ZDHXKXAHOVTTAH-UHFFFAOYSA-N trichlorosilane Chemical compound Cl[SiH](Cl)Cl ZDHXKXAHOVTTAH-UHFFFAOYSA-N 0.000 description 1
- 239000005052 trichlorosilane Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
- H01L29/0603—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions
- H01L29/0607—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration
- H01L29/0611—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices
- H01L29/0615—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices by the doping profile or the shape or the arrangement of the PN junction, or with supplementary regions, e.g. junction termination extension [JTE]
- H01L29/063—Reduced surface field [RESURF] pn-junction structures
- H01L29/0634—Multiple reduced surface field (multi-RESURF) structures, e.g. double RESURF, charge compensation, cool, superjunction (SJ), 3D-RESURF, composite buffer (CB) structures
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- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
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- Composite Materials (AREA)
- Physics & Mathematics (AREA)
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
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Description
図1は、本発明の実施の形態1にかかる製造方法により製造された超接合構造の構成を示す縦断面図である。図1に示すように、n型半導体基板2に深さdのトレンチ3が複数形成されており、それらトレンチ3内は、エピタキシャル成長されたp型半導体4により埋められている。トレンチ3は、基板表面21からの深さが[d−h]のトレンチ上半部31と、このトレンチ上半部31の下につづく、トレンチ上半部31との境界からの深さがhのトレンチ下半部36とから構成されている。
本発明の実施の形態2にかかる製造方法は、トレンチ内に半導体をエピタキシャル成長させる際に、トレンチ開口部とトレンチ底部との間に温度差を設けることによって、トレンチ底部の成長速度を、トレンチ開口部の成長速度よりも相対的に速くする方法である。実施の形態2では、上述した実施の形態1のようにトレンチ底部の縦断面形状がV字状もしくは略V字状になっていてもよいし、基板表面に平行な平面形状となっていてもよい。
本発明の実施の形態3にかかる製造方法は、トレンチ内に半導体をエピタキシャル成長させる際に、トレンチ開口部とトレンチ底部との間に成長ガスの濃度差を設けることによって、トレンチ底部の成長速度を、トレンチ開口部の成長速度よりも相対的に速くする方法である。実施の形態3では、上述した実施の形態1のようにトレンチ底部の縦断面形状がV字状もしくは略V字状になっていてもよいし、基板表面に平行な平面形状となっていてもよい。
3 トレンチ
4 第2導電型の半導体
8 パイプ
21 基板表面
31 トレンチ上半部
32 トレンチ上半部の側壁
36 トレンチ下半部
37 トレンチ下半部の側壁
Claims (8)
- 第1導電型の半導体基板に設けられた、深さがdで基板表面における開口幅がwのトレンチ内に、第2導電型の半導体が埋め込まれた構造を有する超接合半導体素子を製造するにあたって、
第1導電型の半導体基板に、側壁が基板表面に対して垂直か、または略垂直のトレンチ上半部を形成する工程と、
前記トレンチ上半部につづいてその下に、側壁が前記トレンチ上半部の側壁よりも緩く傾斜し、かつ前記トレンチ上半部との境界からの深さがhのトレンチ下半部を形成する工程と、
前記半導体基板を、前記トレンチの開口部からトレンチ底部へ向かって基板内の温度が低くなるように保持した状態で、前記トレンチ上半部および前記トレンチ下半部よりなるトレンチ内に、1000℃以上の塩素を含む原料ガスによる気相成長によって、第2導電型の半導体をエピタキシャル成長させる工程と、
を含むことを特徴とする超接合半導体素子の製造方法。 - [h<d/2]を満たすことを特徴とする請求項1に記載の超接合半導体素子の製造方法。
- 前記トレンチ下半部の側壁は、トレンチ底部を通る基板表面に平行な仮想面に対して85°以下の角度で傾いており、前記トレンチ下半部はV字状の縦断面形状をなしていることを特徴とする請求項1または2に記載の超接合半導体素子の製造方法。
- [10≦d/w]を満たすことを特徴とする請求項1〜3のいずれか一つに記載の超接合半導体素子の製造方法。
- 前記トレンチ下半部の側壁、または前記トレンチ下半部と上半部の側壁が、ファセットを形成する低指数面であることを特徴とする請求項1〜4のいずれか一つに記載の超接合半導体素子の製造方法。
- 減圧CVD法により、前記トレンチ内に第2導電型の半導体をエピタキシャル成長させることを特徴とする請求項1〜5のいずれか一つに記載の超接合半導体素子の製造方法。
- 第1導電型の半導体基板に設けられたトレンチ内に、第2導電型の半導体が埋め込まれた構造を有する超接合半導体素子を製造するにあたって、
第1導電型の半導体基板にトレンチを形成する工程と、
前記半導体基板を、前記トレンチの開口部からトレンチ底部へ向かって基板内の温度が低くなるように保持した状態で、前記トレンチ内に1000℃以上の塩素を含む原料ガスによる気相成長によって第2導電型の半導体をエピタキシャル成長させる工程と、
を含むことを特徴とする超接合半導体素子の製造方法。 - 減圧CVD法により、前記トレンチ内に第2導電型の半導体をエピタキシャル成長させることを特徴とする請求項7に記載の超接合半導体素子の製造方法。
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN104409334A (zh) * | 2014-11-06 | 2015-03-11 | 中航(重庆)微电子有限公司 | 一种超结器件的制备方法 |
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JP3915984B2 (ja) * | 2003-06-17 | 2007-05-16 | 信越半導体株式会社 | シリコンエピタキシャルウェーハの製造方法及びシリコンエピタキシャルウェーハ |
JP5566987B2 (ja) * | 2011-10-28 | 2014-08-06 | 株式会社デンソー | 半導体基板の製造方法 |
CN103413763B (zh) * | 2013-08-22 | 2016-09-28 | 上海华虹宏力半导体制造有限公司 | 超级结晶体管及其形成方法 |
CN106328687B (zh) * | 2015-07-02 | 2020-03-06 | 北大方正集团有限公司 | 一种用于超结器件的外延片的制作方法和结构 |
CN105655385B (zh) * | 2016-01-15 | 2018-08-21 | 上海华虹宏力半导体制造有限公司 | 沟槽型超级结器件的制造方法 |
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CN104409334A (zh) * | 2014-11-06 | 2015-03-11 | 中航(重庆)微电子有限公司 | 一种超结器件的制备方法 |
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