JP5400405B2 - 半導体装置の製造方法 - Google Patents
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- 239000004065 semiconductor Substances 0.000 title claims description 175
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 239000011800 void material Substances 0.000 claims description 18
- 238000005530 etching Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 description 18
- 239000000463 material Substances 0.000 description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- 229910052710 silicon Inorganic materials 0.000 description 8
- 239000010703 silicon Substances 0.000 description 8
- 238000005498 polishing Methods 0.000 description 7
- 230000015556 catabolic process Effects 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 239000012535 impurity Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000003486 chemical etching Methods 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000001020 plasma etching Methods 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- SLLGVCUQYRMELA-UHFFFAOYSA-N chlorosilicon Chemical compound Cl[Si] SLLGVCUQYRMELA-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- BUMGIEFFCMBQDG-UHFFFAOYSA-N dichlorosilicon Chemical compound Cl[Si]Cl BUMGIEFFCMBQDG-UHFFFAOYSA-N 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000126 substance 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
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Description
なお、図5では、プレーナゲート構造の半導体装置1を例示したが、本実施の形態では、トレンチゲート構造の半導体装置を製造してもよい。
また、ピラー状の半導体領域11(または、半導体領域12)の幅は、約4μmであり、その深さは約50μmである。
また、図5では、半導体領域12は、半導体層10に接触しているが、半導体領域12を半導体層10に接触させなくてもよい。
図1〜図4は、本実施の形態の半導体装置1の製造方法を説明するための要部断面模式図である。ここで、図1〜図4では、半導体装置1のSJ構造部の製造方法の例が主に示されている。
次に、図1(b)に示すように、酸化膜30がエッチングにより開口される。この開口部分の幅を“W0”とする。
そして、上述した開口幅W0が化学エッチング等の等方性エッチングによりさらに加工されて、最終的に、開口幅が“W1”の酸化膜30が半導体領域11上に形成される。
そして、図2(b)に示すように、半導体領域12のエピタキシャル成長を続け、半導体領域12の{110}面が庇部30aの先端に到達するまで成長させる。
ここで、シリコンのエピタキシャル成長における成長速度は、シリコンの面方位によって異なり、その速度の順序は、{100}面>{110}面>>{111}面である。
ただし、{110}面同士が接合した直後においては、{111}面の成長速度が{110}面の成長速度よりも遅いことから、半導体領域12の中央部に{111}面を傾斜面とするV型断面40が発生する。
また、{110}面同士が接合することにより、{110}面の接合面12aの何れかの位置にボイド50が発生する場合がある。
ただし、{110}面は、{111}面よりも先に成長して、{110}面同士が接合することから、ボイド50は必ずV型断面40の下方に形成される。
ここで、{111}面の半導体領域12の上面12u(または、半導体領域11の上面11u、あるいは酸化膜30の下面)に対する傾斜角を“θ”とすると、頂点Aから半導体領域12の上面12u(または、半導体領域11の上面11uまでの距離Lは、L=(W1/2)×tanθとなる(θ=54.7°)。
すなわち、W1を制御することにより、Lが特定の値に制御される。
また、半導体領域11及び半導体領域12の研磨手段は、例えばCMP(Chemical Mechanical Polishing)研磨に従う。
このような方法により、半導体装置1のSJ構造部が製造される。
まず、上述したように、半導体層10の主面上にピラー状の半導体領域11と、半導体領域11間にトレンチtrが形成される。トレンチtrを形成したために、トレンチtr底部においては、半導体層10の表面が露出する。
また、この比較例では、酸化膜に上述した庇部を設けないことから、酸化膜30の開口幅W1がトレンチtrの幅W2よりも大きくなってしまう(W1>W2)。
これに対し、本実施の形態に係わる半導体装置の製造方法では、ボイド50を確実に頂点Aより下方に閉じこめることができる。
このように、本実施の形態によれば、半導体装置1のSJ構造部をエピタキシャル成長により形成する際、ボイド50の形成位置が酸化膜30の開口幅W1により制御される。
これにより、SJ構造部の研磨プロセスにおいて、ボイド50が研磨面から露出せず、当該研磨面が確実に平坦になる。すなわち、本実施の形態に従えば、半導体装置の歩留まりが向上する。
なお、本実施の形態では、{110}面、または{111}面の成長速度の差を利用して、ボイド50を確実に頂点Aより下方に閉じこめる例を示したが、成長面に関しては、{110}面、または{010}面の成長速度の差を利用した方法であってもよい。この場合、{110}面よりも{010}面の成長速度が早くなり、トレンチtrの側壁が {010}面となり、{110}面によりV型断面が構成される。
また、トレンチtr加工の際に、エッチングの条件によっては、トレンチtrの側壁がテーパ状となることもある。このような場合も、本実施の形態に包含される。
また、酸化膜30の代わりに、シリコン窒化膜(SiN)を用いてもよい。
Claims (2)
- 第1導電型の第1半導体領域上にマスク部材を形成する工程と、
前記マスク部材に選択的に開口部を形成する工程と、
前記開口部に露出した前記第1半導体領域をエッチングして、前記開口部の径よりも大きな径を有するトレンチと、前記トレンチの上に突出し前記マスク部材からなる庇状マスクと、を形成する工程と、
エピタキシャル成長により、前記庇状マスクの下のトレンチ内に第2導電型の第2半導体領域を形成し、前記第1半導体領域と前記第2半導体領域とが、前記第1半導体領域の主面に対して略平行な方向に交互に繰り返す構造部を形成する工程と、
を備え、
前記トレンチ内に形成される前記第2半導体領域は、前記トレンチの側壁に対して非平行な第1の成長面を有し、
前記トレンチの径よりも径が小さい前記開口部の前記径をW1とし、前記主面と前記第1の成長面とのなす角をθとしたときに、次式
L<(W1/2)×tanθ
を満足する深さLの前記構造部の表面部分を除去する半導体装置の製造方法。 - 前記第2半導体領域は、前記深さLよりも、深い位置にボイドを有する請求項1記載の半導体装置の製造方法。
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JP2011142269A (ja) * | 2010-01-08 | 2011-07-21 | Toshiba Corp | 半導体装置および半導体装置の製造方法 |
JP5668576B2 (ja) * | 2011-04-01 | 2015-02-12 | 住友電気工業株式会社 | 炭化珪素半導体装置 |
US9064808B2 (en) * | 2011-07-25 | 2015-06-23 | Synopsys, Inc. | Integrated circuit devices having features with reduced edge curvature and methods for manufacturing the same |
US8609550B2 (en) | 2011-09-08 | 2013-12-17 | Synopsys, Inc. | Methods for manufacturing integrated circuit devices having features with reduced edge curvature |
JP6054272B2 (ja) | 2013-09-13 | 2016-12-27 | 株式会社東芝 | 半導体装置 |
CN104576311A (zh) * | 2013-10-28 | 2015-04-29 | 上海华虹宏力半导体制造有限公司 | 沟槽的形成和填充方法 |
CN104392926A (zh) * | 2014-11-06 | 2015-03-04 | 中航(重庆)微电子有限公司 | 一种超结器件的制备方法 |
JP2016163004A (ja) * | 2015-03-05 | 2016-09-05 | 株式会社東芝 | 半導体装置および半導体装置の製造方法 |
WO2017168736A1 (ja) * | 2016-03-31 | 2017-10-05 | 新電元工業株式会社 | 半導体装置及び半導体装置の製造方法 |
JP6817895B2 (ja) * | 2017-05-24 | 2021-01-20 | 株式会社東芝 | 半導体装置 |
US11139402B2 (en) | 2018-05-14 | 2021-10-05 | Synopsys, Inc. | Crystal orientation engineering to achieve consistent nanowire shapes |
WO2020001636A1 (en) * | 2018-06-30 | 2020-01-02 | Jin Wei | Semiconductor device, semiconductor apparatus and method of manufacturing the same |
CN109148560B (zh) * | 2018-08-14 | 2021-08-24 | 上海华虹宏力半导体制造有限公司 | 沟槽型超级结的制造方法 |
JP7052659B2 (ja) * | 2018-09-20 | 2022-04-12 | 株式会社デンソー | 窒化物半導体装置とその製造方法 |
JP7279587B2 (ja) * | 2018-09-25 | 2023-05-23 | 豊田合成株式会社 | 半導体装置の製造方法 |
JP7077252B2 (ja) * | 2019-02-27 | 2022-05-30 | 株式会社東芝 | 半導体装置の製造方法 |
US11264458B2 (en) | 2019-05-20 | 2022-03-01 | Synopsys, Inc. | Crystal orientation engineering to achieve consistent nanowire shapes |
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JP5135759B2 (ja) * | 2006-10-19 | 2013-02-06 | 富士電機株式会社 | 超接合半導体装置の製造方法 |
JP5096739B2 (ja) * | 2006-12-28 | 2012-12-12 | ルネサスエレクトロニクス株式会社 | 半導体装置の製造方法 |
JP5103118B2 (ja) * | 2007-09-27 | 2012-12-19 | オンセミコンダクター・トレーディング・リミテッド | 半導体ウエハおよびその製造方法 |
US7893488B2 (en) * | 2008-08-20 | 2011-02-22 | Alpha & Omega Semiconductor, Inc. | Charged balanced devices with shielded gate trench |
JP4844605B2 (ja) * | 2008-09-10 | 2011-12-28 | ソニー株式会社 | 半導体装置 |
US20100155831A1 (en) * | 2008-12-20 | 2010-06-24 | Power Integrations, Inc. | Deep trench insulated gate bipolar transistor |
TWI388059B (zh) * | 2009-05-01 | 2013-03-01 | Niko Semiconductor Co Ltd | The structure of gold-oxygen semiconductor and its manufacturing method |
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