JP5105060B2 - 半導体装置およびその製造方法 - Google Patents
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- 239000004065 semiconductor Substances 0.000 title claims description 72
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 239000000758 substrate Substances 0.000 claims description 39
- 238000002955 isolation Methods 0.000 claims description 15
- 230000003647 oxidation Effects 0.000 claims description 9
- 238000007254 oxidation reaction Methods 0.000 claims description 9
- 238000007743 anodising Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 4
- 230000005284 excitation Effects 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 39
- 229910052710 silicon Inorganic materials 0.000 description 39
- 239000010703 silicon Substances 0.000 description 39
- 239000012535 impurity Substances 0.000 description 15
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 15
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- 238000006243 chemical reaction Methods 0.000 description 6
- 230000007257 malfunction Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 3
- 229920005591 polysilicon Polymers 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000002048 anodisation reaction Methods 0.000 description 1
- 238000005513 bias potential Methods 0.000 description 1
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- 239000012212 insulator Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
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- 230000009467 reduction Effects 0.000 description 1
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Description
図3(a)は、この発明の実施の形態1によるHVICの要部を示す断面図である。図3(a)において、このHVICは、シリコン基板1と、シリコン基板1の表面に形成された誘電体層2と、誘電体層2の表面に形成されたSOI活性層3と、SOI活性層3の表面に形成されたPチャネルMOSトランジスタ4と、PチャネルMOSトランジスタ4を囲むように形成されたリング状のトレンチ分離領域5とを備える。SOI活性層3は、N−型単結晶シリコン層20で構成されている。なお、図中の一点鎖線Oはデバイス中心線である。
図6(a)は、この発明の実施の形態2によるHVICの要部を示す断面図であって、図3(a)と対比される図である。図6(a)において、このHVICが実施の形態1のHVICと異なる点は、第4の埋込酸化膜40が追加されている点である。第4の埋込酸化膜40は、第2のトレンチ31よりも内側の領域においてシールド層11の表面に埋め込まれた状態で、第1の埋込酸化膜10の下に設けられている。第1および第4の埋込酸化膜10,40は、ポーラス酸化膜で一体的に構成されている。
図8(a)は、この発明の実施の形態3によるHVICの要部を示す断面図であって、図6(a)と対比される図である。図8(a)において、このHVICが実施の形態2のHVICと異なる点は、第5の埋込酸化膜41が追加されている点である。第5の埋込酸化膜41は、ドレイン領域の下方の領域においてシールド層11の中央部と置換された状態で、第3および第4の埋込酸化膜13,40の間に設けられている。ドレイン領域の下方の領域では、第1、第3〜第5の埋込酸化膜10,13,40,41は、ポーラス酸化膜で一体的に構成されている。
図10(a)は、この発明の実施の形態4によるHVICの要部を示す断面図であって、図8(a)と対比される図である。図10(a)において、このHVICが実施の形態3のHVICと異なる点は、1つまたは複数(図では6つ)の第6の埋込酸化膜42が追加されている点である。第6の埋込酸化膜42は、第1のトレンチ30よりも内側の領域において低不純物濃度のN型ウェル21内に突出した状態でリング状に形成され、第1の埋込酸化膜10の上に設けられている。
Si+4HF2−+2h+→SiF6 2−+2HF+H2 …(1)
この化学反応により、図12(b)に示すように、N型ウェル21のうちのマスク44の孔44aに対応する部分にポーラスシリコン膜21aが生成される。なお、陽極化成反応は等方性であるので、ポーラスシリコン膜21aの断面形状は幅方向に膨らんだ形状になる。マスク44を除去した後に、N型ウェル21の表面に熱酸化処理を施すと、図12(c)に示すように、ポーラスシリコン膜21aが酸化されて第6の埋込酸化膜42(ポーラス酸化膜)に変化するとともに、N型ウェル21の表面全体に酸化膜45が形成される。この酸化膜45は、基板1の表面に形成された第1の埋込酸化膜10に貼り付けされる。ポーラスシリコン膜21aの熱酸化レートは単結晶シリコンの熱酸化レートの数十〜数百倍大きいので、酸化膜45の膜厚は極薄く設定することが可能である。
図16(a)は、この発明の実施の形態5によるHVICの要部を示す断面図であって、図8(a)と対比される図である。図16(a)において、このHVICが実施の形態3のHVICと異なる点は、1つまたは複数(図では4つ)のN+型シリコン層47が追加されている点である。N+型シリコン層47は、第1のトレンチ30よりも内側の領域において第4の埋込酸化膜40に埋め込まれた状態でリング状に形成され、第1の埋込酸化膜10の下に設けられている。
Claims (11)
- 半導体基板の表面に形成された誘電体層と、
前記誘電体層の表面に形成された第1の半導体層と、
前記第1の半導体層の表面に形成された半導体素子と、
前記半導体素子を囲むように形成されたリング状のトレンチ分離領域とを備え、
前記誘電体層は、
前記半導体基板の表面に形成された第1の埋込酸化膜と、
前記半導体素子に対向して前記第1の埋込酸化膜の下に形成され、予め定められた電位を受けるシールド層と、
前記シールド層を囲むようにして前記第1の埋込酸化膜の下に形成されたリング状の第2の埋込酸化膜と、
前記シールド層および前記第2の埋込酸化膜の下に形成された第3の埋込酸化膜とを含み、
前記トレンチ分離領域は、
前記半導体素子を囲むように順次形成されたリング状の第1〜第3のトレンチと、
前記第1〜第3のトレンチの各々の両側の側壁にそれぞれ形成された2つの酸化膜と、
前記第1〜第3のトレンチの各々の前記2つの酸化膜の間に形成された導電層とを含み、
前記第1および第2のトレンチは前記シールド層の上方に設けられ、前記第3のトレンチは前記第2の埋込酸化膜の上方に設けられ、
前記第1および第3のトレンチの各々は前記第1の半導体層を貫通して前記第1の埋込酸化膜に到達し、前記第2のトレンチは前記第1の半導体層および前記第1の埋込酸化膜を貫通して前記シールド層に到達し、
前記シールド層は、前記第2のトレンチ内の前記導電層を介して前記予め定められた電位を受け、
前記誘電体層は、さらに、前記第2のトレンチよりも内側の領域において前記シールド層に埋め込まれた状態で、前記第1の埋込酸化膜の下に形成された第4の埋込酸化膜を含む、半導体装置。 - 前記シールド層はリング状に形成されており、
前記誘電体層は、さらに、前記シールド層よりも内側の領域において前記第3および第4の埋込酸化膜間に形成された第5の埋込酸化膜を含む、請求項1に記載の半導体装置。 - 前記誘電体層は、さらに、前記第1のトレンチよりも内側の領域において前記第1の半導体層内に突出した状態で、前記第1の埋込酸化膜の上に形成された1または2以上の第6の埋込酸化膜を含み、
各第6の埋込酸化膜は前記半導体装置の中心線を囲むようにリング状に形成されている、請求項2に記載の半導体装置。 - 各第6の埋込酸化膜はリング状に配列された複数の副酸化膜に分割されている、請求項3に記載の半導体装置。
- 前記誘電体層は、さらに、前記第1のトレンチよりも内側の領域において前記第4の埋込酸化膜に埋め込まれた状態で、前記第1の埋込酸化膜の下に形成された1または2以上の第2の半導体層を含み、
各第2の半導体層は前記半導体装置の中心線を囲むようにリング状に形成されている、請求項2に記載の半導体装置。 - 各第2の半導体層はリング状に配列された複数の副半導体層に分割されている、請求項5に記載の半導体装置。
- 前記シールド層は半導体で形成されている、請求項1から請求項6までのいずれかに記載の半導体装置。
- 前記第1の埋込酸化膜以外の各埋込酸化膜はポーラス酸化膜で構成されている、請求項1から請求項7までのいずれかに記載の半導体装置。
- 前記半導体素子はPチャネルMOSトランジスタであり、
前記PチャネルMOSトランジスタは、
前記第1の半導体層の表面の中央部に形成されたドレイン電極と、
前記ドレイン電極を囲むようにして前記第1の半導体層の表面に形成されたリング状のゲート電極と、
前記ゲート電極を囲むようにして前記第1の半導体層の表面に形成されたリング状のソース電極とを含む、請求項1から請求項8までのいずれかに記載の半導体装置。 - 前記予め定められた電位は、前記PチャネルMOSトランジスタのソース電位と接地電位との間の電圧を分圧した電位である、請求項9に記載の半導体装置。
- 請求項3または請求項4に記載の半導体装置の製造方法であって、
2枚の半導体基板を使用し、
一方の半導体基板の表面に前記誘電体層を形成し、
前記第6の埋込酸化膜に応じた形状の孔を有する遮光性のマスクを他方の半導体基板の表面に形成し、
前記他方の半導体基板の表面側から裏面側に陽極化成電流を流すとともに前記マスクの孔を介して前記他方の半導体基板に励起光を照射してポーラス半導体膜を形成し、
前記マスクを除去した後に前記他方の半導体基板の表面に熱酸化処理を施して前記ポーラス半導体膜を前記第6の埋込酸化膜に変化させ、
前記2枚の半導体基板の表面を貼り合わせ、前記他方の半導体基板を前記第1の半導体層として使用する、半導体装置の製造方法。
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JP2007298083A JP5105060B2 (ja) | 2007-11-16 | 2007-11-16 | 半導体装置およびその製造方法 |
TW097117670A TWI364843B (en) | 2007-11-16 | 2008-05-14 | Semiconductor device and method of manufacturing the same |
US12/123,720 US7851873B2 (en) | 2007-11-16 | 2008-05-20 | Semiconductor device and method of manufacturing the same |
KR1020080060698A KR100964323B1 (ko) | 2007-11-16 | 2008-06-26 | 반도체 장치 및 그 제조방법 |
FR0854851A FR2923949A1 (fr) | 2007-11-16 | 2008-07-16 | Dispositif semi-conducteur et procede de fabrication de celui-ci. |
DE102008038834A DE102008038834A1 (de) | 2007-11-16 | 2008-08-13 | Halbleitervorrichtung und Verfahren zur Herstellung derselben |
CN2008101456711A CN101436599B (zh) | 2007-11-16 | 2008-08-15 | 半导体装置及其制造方法 |
US12/941,212 US8110449B2 (en) | 2007-11-16 | 2010-11-08 | Semiconductor device and method of manufacturing the same |
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JP (1) | JP5105060B2 (ja) |
KR (1) | KR100964323B1 (ja) |
CN (1) | CN101436599B (ja) |
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JP5610930B2 (ja) * | 2010-08-30 | 2014-10-22 | 三菱電機株式会社 | 半導体装置 |
JP6053415B2 (ja) * | 2012-09-19 | 2016-12-27 | 三菱電機株式会社 | 半導体装置 |
US9786777B2 (en) * | 2013-08-30 | 2017-10-10 | Hewlett-Packard Development Company, L.P. | Semiconductor device and method of making same |
JP6585978B2 (ja) * | 2015-09-24 | 2019-10-02 | ラピスセミコンダクタ株式会社 | 半導体装置および半導体装置の製造方法 |
CN106558634B (zh) * | 2015-09-25 | 2018-04-20 | 比亚迪股份有限公司 | 光电二极管及光电二极管的制造方法 |
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JPH05315437A (ja) | 1992-05-12 | 1993-11-26 | Nippondenso Co Ltd | 半導体装置の製造方法 |
DE4231310C1 (de) | 1992-09-18 | 1994-03-24 | Siemens Ag | Verfahren zur Herstellung eines Bauelementes mit porösem Silizium |
JP3864430B2 (ja) | 1995-04-28 | 2006-12-27 | 株式会社デンソー | 半導体装置の製造方法 |
JPH08335684A (ja) | 1995-06-08 | 1996-12-17 | Toshiba Corp | 半導体装置 |
JPH0945762A (ja) | 1995-07-26 | 1997-02-14 | Matsushita Electric Works Ltd | 半導体素子基体およびその製造方法 |
JPH09120995A (ja) * | 1995-08-22 | 1997-05-06 | Mitsubishi Electric Corp | 半導体装置およびその製造方法 |
JP3435930B2 (ja) | 1995-09-28 | 2003-08-11 | 株式会社デンソー | 半導体装置及びその製造方法 |
JPH11195712A (ja) * | 1997-11-05 | 1999-07-21 | Denso Corp | 半導体装置およびその製造方法 |
JP3509552B2 (ja) | 1998-04-30 | 2004-03-22 | 株式会社デンソー | 半導体装置 |
KR20050063315A (ko) | 2003-12-22 | 2005-06-28 | 매그나칩 반도체 유한회사 | 고전압 트랜지스터 및 그 제조 방법 |
JP4618629B2 (ja) * | 2004-04-21 | 2011-01-26 | 三菱電機株式会社 | 誘電体分離型半導体装置 |
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JP2009124020A (ja) | 2009-06-04 |
KR100964323B1 (ko) | 2010-06-17 |
CN101436599B (zh) | 2011-05-18 |
KR20090050927A (ko) | 2009-05-20 |
TWI364843B (en) | 2012-05-21 |
US20090127637A1 (en) | 2009-05-21 |
US20110053348A1 (en) | 2011-03-03 |
TW200924195A (en) | 2009-06-01 |
CN101436599A (zh) | 2009-05-20 |
US8110449B2 (en) | 2012-02-07 |
DE102008038834A1 (de) | 2009-05-28 |
FR2923949A1 (fr) | 2009-05-22 |
US7851873B2 (en) | 2010-12-14 |
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