JP4743744B2 - フローティングアイランド電圧維持層を有する半導体パワーデバイス - Google Patents
フローティングアイランド電圧維持層を有する半導体パワーデバイス Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims description 89
- 210000000746 body region Anatomy 0.000 claims description 58
- 238000004519 manufacturing process Methods 0.000 claims description 35
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 31
- 239000012535 impurity Substances 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 25
- 239000000758 substrate Substances 0.000 claims description 23
- 238000005530 etching Methods 0.000 claims description 17
- 235000012239 silicon dioxide Nutrition 0.000 claims description 15
- 239000000377 silicon dioxide Substances 0.000 claims description 15
- 239000003989 dielectric material Substances 0.000 claims description 13
- 230000004888 barrier function Effects 0.000 claims description 11
- 238000009792 diffusion process Methods 0.000 claims description 10
- 238000012423 maintenance Methods 0.000 claims description 8
- 229910044991 metal oxide Inorganic materials 0.000 claims description 8
- 150000004706 metal oxides Chemical class 0.000 claims description 8
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 8
- 230000002411 adverse Effects 0.000 claims description 7
- 238000000151 deposition Methods 0.000 claims description 7
- 229920005591 polysilicon Polymers 0.000 claims description 7
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical group [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 6
- 229910052796 boron Inorganic materials 0.000 claims description 6
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 4
- 235000012489 doughnuts Nutrition 0.000 claims description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 4
- 230000005669 field effect Effects 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 10
- 229910052710 silicon Inorganic materials 0.000 description 10
- 239000010703 silicon Substances 0.000 description 10
- 230000015556 catabolic process Effects 0.000 description 6
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 4
- 230000000873 masking effect Effects 0.000 description 4
- 230000005684 electric field Effects 0.000 description 3
- 238000002513 implantation Methods 0.000 description 3
- 229910052785 arsenic Inorganic materials 0.000 description 2
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 2
- 238000001020 plasma etching Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Description
Claims (35)
- A.第1の伝導型の基板を準備する工程と、
B.
1.上記基板上に、第1の伝導型を有するエピタキシャル層を成長させる工程と、
2.上記エピタキシャル層内に少なくとも1つのトレンチを形成する工程と、
3.上記トレンチの壁に沿ってバリア材を堆積させる工程と、
4.上記バリア材を介して、上記エピタキシャル層の上記トレンチの底部に隣接する下方の部分に、第2の伝導型の不純物を打ち込む工程と、
5.上記不純物を拡散させて、上記エピタキシャル層内に第1のドープ層を形成する工程と、
6.上記トレンチの少なくとも底部から上記バリア材を取り除く工程と、
7.上記第1のドープ層を貫通して、上記トレンチをエッチングする工程と、
8.上記トレンチ内に、当該半導体パワーデバイスの特性に悪い影響を与えない誘電体材料を堆積させて、該トレンチを埋め込む工程と
によって、上記基板上のエピタキシャル層内に電圧維持領域を形成する工程と、
C.上記電圧維持領域上に、第2の伝導型のボディ領域を少なくとも1つ形成し、該ボディ領域と該電圧維持領域との間に接合を画定する工程とを有し、
上記ボディ領域は、深いボディ領域を有することを特徴とする半導体パワーデバイスの製造方法。 - 上記トレンチをより深くエッチングし、上記工程(B.3)〜(B.6)を繰り返して、上記第1のドープ層の垂直方向に下方の位置に、第2のドープ層を形成する工程と、
上記第2のドープ層を貫通して、上記トレンチをエッチングする工程とを更に有する請求項1記載の半導体パワーデバイスの製造方法。 - 上記工程Cは、
上記接合上に、酸化層及びポリシリコン層を有するゲート導電層を形成する工程と、
上記エピタキシャル層内の上記電圧維持領域上に、上記第2の伝導型を有する第1及び第2のボディ領域を形成し、該第1及び第2のボディ領域間にドリフト領域を画定する工程と、
上記第1及び第2のボディ領域内に、上記第1の伝導型の第1及び第2のソース領域をそれぞれ形成する工程とを更に有し、
上記第1及び第2のボディ領域は、それぞれ深いボディ領域を有することを特徴とする請求項1記載の半導体パワーデバイスの製造方法。 - 上記バリア材は、酸化物材料であることを特徴とする請求項1記載の半導体パワーデバイスの製造方法。
- 上記酸化物材料は、二酸化シリコンであることを特徴とする請求項4記載の半導体パワーデバイスの製造方法。
- 上記エピタキシャル層は、所定の厚さを有し、
D.xを上記電圧維持領域に形成するドープ層の所定数に対応する2以上の整数として、上記トレンチを、上記所定の厚さの1/(x+1)に等しい距離分エッチングする工程と、
E.上記工程(B.3)〜(B.6)を繰り返して、上記第1のドープ層の垂直方向に下方に更なるドープ層を形成する工程と、
F.上記所定数のドープ層が形成されるまで、上記工程D〜Eを繰り返し行う工程と、
G.上記ドープ層のx番目の層を貫通して、上記トレンチをエッチングする工程とを更に有する請求項1記載の半導体パワーデバイスの製造方法。 - 上記誘電体材料は、二酸化シリコンであることを特徴とする請求項1記載の半導体パワーデバイスの製造方法。
- 上記誘電体材料は、窒化シリコンであることを特徴とする請求項1記載の半導体パワーデバイスの製造方法。
- 上記不純物は、ホウ素であることを特徴とする請求項1記載の半導体パワーデバイスの製造方法。
- 上記トレンチは、少なくとも1つのトレンチを画定するマスク層を設け、該マスク層を介して、当該トレンチをエッチングすることによって形成されることを特徴とする請求項1記載の半導体パワーデバイスの製造方法。
- 上記第1及び第2のボディ領域は、上記エピタキシャル層内に不純物を打ち込み、拡散させることによって形成されることを特徴とする請求項3記載の半導体パワーデバイスの製造方法。
- 上記半導体パワーデバイスは、縦型二重拡散金属酸化膜半導体、V溝二重拡散金属酸化膜半導体、トレンチ二重拡散金属酸化膜半導体電界効果トランジスタ、絶縁ゲートバイポーラトランジスタ及びバイポーラトランジスタからなるグループから選択されることを特徴とする請求項1記載の半導体パワーデバイスの製造方法。
- 請求項1記載の半導体パワーデバイスの製造方法に基づいて製造された半導体パワーデバイス。
- 請求項6記載の半導体パワーデバイスの製造方法に基づいて製造された半導体パワーデバイス。
- 請求項12記載の半導体パワーデバイスの製造方法に基づいて製造された半導体パワーデバイス。
- 第1の伝導型の基板と、
上記基板上に成長された第1の伝導型を有するエピタキシャル層内に形成された電圧維持領域と、
上記電圧維持領域上に形成され、第2の伝導性を有し、該電圧維持領域との間に接合を画定する少なくとも1つのボディ領域とを備え、
上記電圧維持領域は、
上記エピタキシャル層内に形成された少なくとも1つのトレンチと、
上記エピタキシャル層内の上記トレンチの側壁に隣接する部分に設けられた、第2の伝導型の不純物がドープされた少なくとも1つのドープ層と、
上記トレンチに埋め込まれた当該半導体パワーデバイスの特定に悪い影響を与えない誘電体材料とを有し、
上記ボディ領域は、深いボディ領域を有し、
上記ドープ層は、垂直方向に分離されて形成されたフローティング領域であることを特徴とする半導体パワーデバイス。 - 上記少なくとも1つのドープ層は、互いに垂直方向の列として配置された複数のドープ層であることを特徴とする請求項16記載の半導体パワーデバイス。
- 上記少なくとも1つのボディ領域は、
酸化層及びポリシリコン層を有し、上記接合上に形成されたゲート導電層と、
上記エピタキシャル層内の上記電圧維持領域上に形成され、上記第2の伝導型を有し、ドリフト領域を画定する第1及び第2のボディ領域と、
上記第1及び第2のボディ領域内にそれぞれ形成された上記第1の伝導型の第1及び第2のソース領域とを更に有し、
上記第1及び第2のボディ領域は、それぞれ深いボディ領域を有することを特徴とする請求項16記載の半導体パワーデバイス。 - 上記誘電体材料は、二酸化シリコンであることを特徴とする請求項16記載の半導体パワーデバイス。
- 上記誘電体材料は、窒化シリコンであることを特徴とする請求項16記載の半導体パワーデバイス。
- 上記不純物は、ホウ素であることを特徴とする請求項16記載の半導体パワーデバイス。
- 上記トレンチは、円形の断面を有することを特徴とする請求項16記載の半導体パワーデバイス。
- 上記少なくとも1つのドープ層は、ドーナツ状の形状を有することを特徴とする請求項22記載の半導体パワーデバイス。
- 上記複数のドープ層のうちの少なくとも1つのドープ層は、ドーナツ状の形状を有することを特徴とする請求項17記載の半導体パワーデバイス。
- 上記トレンチは、正方形、長方形、八角形及び六角形からなるグループから選択される断面形状を有していることを特徴とする請求項16記載の半導体パワーデバイス。
- A.第1の伝導型の基板を準備する工程と、
B.
1.上記基板上に、第1の伝導型を有するエピタキシャル層を成長させる工程と、
2.上記エピタキシャル層内に少なくとも1つのトレンチを形成する工程と、
3.上記トレンチの壁に沿ってバリア材を堆積させる工程と、
4.上記バリア材を介して、上記エピタキシャル層の上記トレンチの底部に隣接する下方の部分に、第2の伝導型の不純物を打ち込む工程と、
5.上記不純物を拡散させて、上記エピタキシャル層内に第1のドープ層を形成する工程と、
6.上記トレンチの少なくとも底部から上記バリア材を取り除く工程と、
7.上記トレンチ内に、当該半導体パワーデバイスの特性に悪い影響を与えない誘電体材料を堆積させて、該トレンチを埋め込む工程と
によって、上記基板上のエピタキシャル層内に電圧維持領域を形成する工程と、
C.上記電圧維持領域上に、第2の伝導型のボディ領域を少なくとも1つ形成し、該ボディ領域と該電圧維持領域との間に接合を画定する工程とを有し、
上記ボディ領域は、深いボディ領域を有することを特徴とする半導体パワーデバイスの製造方法。 - 上記第1のドープ層を貫通して、上記トレンチをエッチングする工程を更に有する請求項26記載の半導体パワーデバイスの製造方法。
- 上記トレンチをより深くエッチングし、上記工程(B.3)〜(B.6)を繰り返して、上記第1のドープ層の垂直方向に下方の位置に、第2のドープ層を形成する工程と、
上記第2のドープ層を貫通して、上記トレンチをエッチングする工程とを更に有する請求項27記載の半導体パワーデバイスの製造方法。 - 上記工程Cは、
上記接合上に、酸化層及びポリシリコン層を有するゲート導電層を形成する工程と、
上記エピタキシャル層内の上記電圧維持領域上に、第2の伝導型を有する第1及び第2のボディ領域を形成し、該第1及び第2のボディ領域間にドリフト領域を画定する工程と、
上記第1及び第2のボディ領域内に、第1の伝導型の第1及び第2のソース領域をそれぞれ形成する工程とを更に有し、
上記第1及び第2のボディ領域は、それぞれ深いボディ領域を有することを特徴とする請求項26記載の半導体パワーデバイスの製造方法。 - 上記バリア材は、酸化物材料であることを特徴とする請求項26記載の半導体パワーデバイスの製造方法。
- 上記酸化物材料は、二酸化シリコンであることを特徴とする請求項30記載の半導体パワーデバイスの製造方法。
- 上記エピタキシャル層は、所定の厚さを有し、
D.xを上記電圧維持領域に形成するドープ層の所定数に対応する2以上の整数として、上記トレンチを、上記所定の厚さの1/(x+1)に等しい距離分エッチングする工程と、
E.上記工程(B.3)〜(B.6)を繰り返して、上記第1のドープ層の垂直方向に下方に更なるドープ層を形成する工程と、
F.上記所定数のドープ層が形成されるまで、上記工程D〜Eを繰り返し行う工程と、
G.上記ドープ層のx番目の層を貫通して、上記トレンチをエッチングする工程とを更に有する請求項27記載の半導体パワーデバイスの製造方法。 - 上記誘電体材料は、二酸化シリコンであることを特徴とする請求項26記載の半導体パワーデバイスの製造方法。
- 上記誘電体材料は、窒化シリコンであることを特徴とする請求項26記載の半導体パワーデバイスの製造方法。
- 上記不純物は、ホウ素であることを特徴とする請求項27記載の半導体パワーデバイスの製造方法。
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US09/970,972 | 2001-10-04 | ||
US09/970,972 US6465304B1 (en) | 2001-10-04 | 2001-10-04 | Method for fabricating a power semiconductor device having a floating island voltage sustaining layer |
PCT/US2002/031638 WO2003030244A1 (en) | 2001-10-04 | 2002-10-03 | Method for fabricating a power semiconductor device having a floating island voltage sustaining layer |
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EP (1) | EP1433201A4 (ja) |
JP (1) | JP4743744B2 (ja) |
KR (1) | KR100952389B1 (ja) |
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CN1305122C (zh) | 2007-03-14 |
US6465304B1 (en) | 2002-10-15 |
KR100952389B1 (ko) | 2010-04-14 |
TW586167B (en) | 2004-05-01 |
KR20040037244A (ko) | 2004-05-04 |
WO2003030244A1 (en) | 2003-04-10 |
JP2005505921A (ja) | 2005-02-24 |
EP1433201A1 (en) | 2004-06-30 |
US6624494B2 (en) | 2003-09-23 |
US20030068863A1 (en) | 2003-04-10 |
WO2003030244A8 (en) | 2003-06-19 |
CN1572018A (zh) | 2005-01-26 |
EP1433201A4 (en) | 2009-02-11 |
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