JP2007524219A - 半導体装置、および薄層歪緩和バッファ成長方法 - Google Patents
半導体装置、および薄層歪緩和バッファ成長方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 53
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- 229910000577 Silicon-germanium Inorganic materials 0.000 claims description 63
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 28
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- 229910052799 carbon Inorganic materials 0.000 claims description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 17
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- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 2
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- MROCJMGDEKINLD-UHFFFAOYSA-N dichlorosilane Chemical compound Cl[SiH2]Cl MROCJMGDEKINLD-UHFFFAOYSA-N 0.000 description 2
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Abstract
Description
Si1−xGexの第1エピタキシャル層、xはGe濃度である;
前記第1エピタキシャル層上の、Si1−xGex:Cの第2エピタキシャル層、Cの量は少なくとも0.3%である;および、
前記第2層上の、Si1−xGexの第3エピタキシャル層。
半導体基板を提供するステップと、
前記半導体基板の少なくとも一部分上に、第1エピタキシャル層SiGeを、Ge濃度が前記第1層にわたって本質的に一定となるような形で付着させるステップと、
前記第1SiGeエピタキシャル層の上部に、少なくとも0.3%の炭素を組み込んだSiGeを成長させることにより、第2層SiGe:Cを、第1層におけるのと同様にGe濃度が前記SiGe:C層にわたって本質的に一定となるような形で付着させるステップと、
前記SiGe:C層の上部に、第2SiGeエピタキシャル層を、Ge濃度が前記第3層にわたって本質的に一定となるような形で付着させるステップと
を含むことを特徴とする。
ウエハをロードロックから成長チャンバへロードすること、
HF水溶液での酸化物溶解などの任意の方法により、必要なら、その後に標準手順に従うエピタキシーツール内での現場焼き付けを用いて、あらゆる自然シリコン酸化物または微量の酸化物を取り除くこと。
SiGeおよびSiGe:Cに対してはおよそ600℃で、Siに対してはおよそ650℃での、エピタキシャル層のデポジション。
炭素を加えるために、炭素を含むガスを供給する。これは、zおよびwが1〜4に等しいSiHz(CH3)wのような、しかしこれに限定されない、Cを含むいかなる化合物でもよい。少なくとも0.3%、理想的には0.5〜1%、の炭素が組み込まれる。
a)HF水溶液での酸化物溶解などの任意の方法により、必要なら、その後に標準手順に従うエピタキシーツール内での現場焼き付けを用いて、あらゆる自然シリコン酸化物または微量酸化物を除去すること。
b)その後、TSRBは、先駆ガスとして、ジクロロシラン(DCS)、ジャーメイン エン(Germane en)モノメチルシラン(MMS)を用いて、650℃で成長させられる。デポジションの間、HClを用いることにより、TSRBは、その後に選択的(すなわち、シリコン上にのみ)成長が可能となる。他のSi、C、およびGe先駆ガスも、デポジションが選択性のままである限り、使用可能であろう。
Claims (35)
- 半導体基板を含み、その上部に少なくとも薄層歪緩和バッファを有し、本質的に3層のスタックから成っている半導体装置は、前記薄層歪緩和バッファが前記半導体装置のアクティブ部分でなく、さらに、前記薄層歪緩和バッファを形成する前記3層が本質的に一定のGe濃度を有することを特徴としており、前記3層は、
Si1−xGexであって、xはGe濃度である第1エピタキシャル層と、
前記第1エピタキシャル層上の、Si1−xGex:Cであって、Cの量は少なくとも0.3%である第2エピタキシャル層と、
前記第2層上のSi1−xGexの第3エピタキシャル層と
であることを特徴とする半導体装置。 - 前記第2エピタキシャル層の厚みが1〜20nmであることを特徴とする請求項1に記載の半導体装置。
- 前記第2エピタキシャル層の厚みが1〜10nmであることを特徴とする請求項1に記載の半導体装置。
- 前記第2エピタキシャル層の厚みが5nmであることを特徴とする請求項1に記載の半導体装置。
- Ge濃度が5〜100%であることを特徴とする請求項1に記載の半導体装置。
- Ge濃度10〜65%であることを特徴とする請求項1に記載の半導体装置。
- C濃度が0.5%より高いことを特徴とする請求項1に記載の半導体装置。
- C濃度が0.5〜1%であることを特徴とする請求項1に記載の半導体装置。
- C濃度が0.8%であることを特徴とする請求項1に記載の半導体装置。
- 薄層歪緩和バッファの最上部に、SiGe/Siヘテロ構造をさらに有し、前記ヘテロ構造が歪調整されたSiGe層および歪シリコン層を含むことを特徴とする請求項1から請求項9の何れか一項に記載の半導体装置。
- その最上部にIII−V族化合物を有することを特徴とする請求項1から請求項9の何れか一項に記載の半導体装置。
- 前記第1エピタキシャルSiGe層の下に追加エピタキシャルSi1−xGex:C層をさらに含むことを特徴とする請求項1から請求項9の何れか一項に記載の半導体装置。
- 前記追加エピタキシャルSi1−xGex:Cの下に、追加エピタキシャルSi1−xGexをさらに含むことを特徴とする請求項12に記載の半導体装置。
- 半導体基板を提供するステップと、
前記半導体基板の少なくとも一部分上に、第1エピタキシャル層SiGeを、Ge濃度が前記第1層にわたって本質的に一定となるような形で付着させるステップと、
前記第1SiGeエピタキシャル層の最上部上に、少なくとも0.3%の炭素を組み込んだSiGeを成長させることにより、前記第2層SiGe:Cを、前記第1層におけるのと同様にGe濃度が前記SiGe:C層にわたって本質的に一定となるような形で付着させるステップと、
前記SiGe:C層の最上部上に、第2SiGeエピタキシャル層を、Ge濃度が前記第3層にわたって本質的に一定となるような形で付着させるステップと
を含むことを特徴とする薄層歪緩和バッファの成長方法。 - 前記半導体基板がシリコンであることを特徴とする請求項14に記載の方法。
- 前記Ge濃度が5〜100%であることを特徴とする請求項14に記載の方法。
- 前記Ge濃度が10〜65%であることを特徴とする請求項14に記載の方法。
- 前記C濃度が0.5%より高いことを特徴とする請求項14に記載の方法。
- 前記C濃度が0.5〜1%であることを特徴とする請求項14に記載の方法。
- 前記C濃度が0.8%であることを特徴とする請求項14に記載の方法。
- 第1および第2先駆ガスが設けられ、前記第1先駆ガスが、Siを含む化合物、または、zおよびwが1〜4に等しいSiHzClwグループからの化合物を含み、第2先駆ガスが、Geを含む先駆化合物であり、前記層は、前記先駆ガスを利用して付着されることを特徴とする請求項14に記載の方法。
- Cを含むいかなる化合物であれ、炭素を含むガスが供給されることを特徴とする請求項14に記載の半導体装置。
- 前記半導体基板の少なくとも一部分上の、前記第1エピタキシャルSiGe層の下に、追加エピタキシャルSi1−xGex:C層を付着する追加ステップを含むことを特徴とする請求項14に記載の方法。
- 前記半導体基板の少なくとも一部分上の、前記追加エピタキシャルSi1−xGex:C層の下に、追加エピタキシャルSi1−xGex層を付着する追加ステップを含むことを特徴とする請求項23に従う方法。
- 前記第3エピタキシャル層の上部に、追加シリコンキャップ層を付着するステップをさらに含むことを特徴とする請求項14に記載の方法。
- 前記半導体基板および前記3つのエピタキシャル層から成る構造が、最高温度が前記SiGe層の融点によって定義される、800℃以上の温度にさらされる追加ステップを含むことを特徴とする請求項14に記載の方法。
- 前記構造は、少なくとも前記追加層の1つをさらに含むことを特徴とする請求項26に記載の方法。
- 薄層歪緩和バッファの上部に歪調整SiGe層を付着する追加ステップを含むことを特徴とする請求項14から請求項27の何れか一項に記載の方法。
- 前記歪調整SiGe層の上部に歪シリコン層を付着する、追加ステップを含むことを特徴とする請求項28に記載の方法。
- 前記3つのエピタキシャル層を付着させ、さらに、800℃以上の温度にさらすステップが、異なるステップ間において酸化雰囲気へさらすことなく実行されることを特徴とする請求項26に記載の方法。
- 前記3つのエピタキシャル層を付着させ、さらに追加シリコンキャップ層を付着させ、さらに800℃以上の温度にさらすステップが、異なるステップ間において酸化雰囲気へさらすことなく実行されることを特徴とする請求項25または請求項26に記載の方法。
- 全てのステップが、異なるステップ間において酸化雰囲気へさらすことなく実行されることを特徴とする請求項29に記載の方法。
- ステップが、異なるステップ間において酸化雰囲気へさらすことなく、同じツール内で実行されることを特徴とする請求項32に記載の方法。
- 前記基板がブランケットウエハであることを特徴とする請求項14に記載の方法。
- 前記基板がパターン加工されたウエハであることを特徴とする請求項14に記載の方法。
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EP03447007A EP1439570A1 (en) | 2003-01-14 | 2003-01-14 | SiGe strain relaxed buffer for high mobility devices and a method of fabricating it |
EP03447007.0 | 2003-01-14 | ||
PCT/BE2004/000009 WO2004064130A1 (en) | 2003-01-14 | 2004-01-14 | SiGe STRAIN RELAXED BUFFER FOR HIGH MOBILITY DEVICES AND A METHOD OF FABRICATING IT |
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EP1588408B1 (en) | 2014-06-25 |
TW200504835A (en) | 2005-02-01 |
CN1723545B (zh) | 2010-05-05 |
CN1723545A (zh) | 2006-01-18 |
WO2004064130A1 (en) | 2004-07-29 |
TWI287254B (en) | 2007-09-21 |
EP1588408A1 (en) | 2005-10-26 |
US6906400B2 (en) | 2005-06-14 |
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JP5013859B2 (ja) | 2012-08-29 |
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