JP2009516364A - 電荷キャリア移動度修正のための回転剪断応力 - Google Patents
電荷キャリア移動度修正のための回転剪断応力 Download PDFInfo
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- H01L21/76—Making of isolation regions between components
- H01L21/762—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
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Abstract
【解決手段】 半導体構造体及びその製造方法は、分離トレンチにより取り囲まれた活性領域メサを有する半導体基板を使用する。第1応力を有する第1分離領域は分離トレンチに配置される。第1応力とは異なる第2応力を有する第2分離領域もまた分離トレンチに配置される。第1分離領域及び第2分離領域は活性領域メサに回転剪断応力をかけるような大きさにされ、そのように位置決めされる。
【選択図】 図8
Description
図1は、活性領域メサ11を示す。活性領域メサ11は、完全に第1分離領域12により囲まれる。一対の第2分離領域16a及び16bは、活性領域メサ11の一対の向かい合う角部においてこれに隣接する。これらは、第1分離領域12とは異なり、活性領域メサ11を完全に囲まない。典型的には、活性領域メサ11の面積は、サブミクロンのデバイスを受け入れるような大きさにされるが、これは本発明の必要条件でもないし、制限でもない。典型的には、一対の第2分離領域16a及び16bの面積又は容量は、第1分離領域12の面積又は容量の約5%から約10%までの大きさにされる。本発明は、そのように限定されるものではない。第1分離領域及び一対の第2分離領域のような分離領域の相対的な面積比又は容量比がより大きい場合もまた、本発明の範囲に入る。
活性領域メサ11と一対の第2分離領域16e及び16fとの間の異なる応力の幾つかの介在する第1絶縁体材料によりもたらされる。
シリコン酸化物材料は、第1分離領域12a及び12bもシリコン酸化物材料を含むときには、これらを形成するために用いられたものとは異なる方法を用いて形成することができる。例えば、シリコン酸化物材料は、堆積されたアモルファスシリコン材料又はポリシリコン材料の熱酸化を用いて形成することができる。酸化は、活性領域メサ11を実質的に酸化させないように行われる。こうした熱酸化により生じるシリコン酸化物材料は、シリコン酸化物材料を生成するための酸化により、アモルファスシリコン材料又はポリシリコン材料のいずれかの体積が増加するため、特に高い圧縮応力を有することができる。こうしたシリコン酸化物材料により第2分離領域を形成するときには、熱成長シリコン酸化物が、活性領域メサ11及びエッチングされた第1分離領域12bを部分的に覆うことが多いため、(必ずしも必要なわけではないが)典型的には、さらに平坦化法が必要になる。この理由のために、必要に応じて、ボイド15内に第2分離領域16aを形成する前に、まず平坦化停止ライナ層が形成され、図6に示される一対のパターン形成されたフォトレジスト層14a及び14bがない半導体構造体上に配置される。典型的には、窒化物及び酸窒化物材料が、平坦化停止層に適切である。
Claims (20)
- 分離トレンチにより取り囲まれた活性領域メサを有する半導体基板と、
第1応力を有し、前記分離トレンチに配置された少なくとも1つの第1分離領域と、
前記第1応力とは異なる第2応力を有し、同様に前記分離トレンチに配置された少なくとも1つの第2分離領域であって、前記第1分離領域及び前記第2分離領域は前記活性領域メサに回転剪断応力をかけるような大きさにされ、そのように位置決めされる、第2分離領域と
を含む半導体構造体。 - 前記第1分離領域及び前記第2分離領域の両方が前記活性領域メサに接触する、請求項1に記載の半導体構造体。
- 前記第1分離領域及び前記第2分離領域の一方だけが前記活性領域メサに接触する、請求項1に記載の半導体構造体。
- 前記分離トレンチは浅い分離トレンチである、請求項1に記載の半導体構造体。
- 前記回転剪断応力は時計回り方向である、請求項1に記載の半導体構造体。
- 前記回転剪断応力は反時計周り方向である、請求項1に記載の半導体構造体。
- 前記活性領域メサの上に配置された半導体デバイスをさらに含む、請求項1に記載の半導体構造体。
- 前記半導体デバイスは電界効果トランジスタである、請求項7に記載の半導体構造体。
- 分離トレンチにより取り囲まれた活性領域メサを有する半導体基板と、
第1応力を有し、前記分離トレンチに配置された少なくとも1つの第1分離領域と、
前記第1応力とは異なる第2応力を有し、同様に前記分離トレンチに配置された少なくとも1つの第2分離領域と
を含み、
前記第1分離領域及び前記第2分離領域は前記活性領域メサに回転剪断応力をかけるような大きさにされ、そのように位置決めされており、
前記第1分離領域及び前記第2分離領域は、同じ化学組成で構成される、
半導体構造体。 - 前記第1分離領域及び前記第2分離領域はシリコン酸化物を含む、請求項9に記載の半導体構造体。
- 前記回転剪断応力は時計回り方向である、請求項9に記載の半導体構造体。
- 前記回転剪断応力は反時計回り方向である、請求項9に記載の半導体構造体。
- 半導体構造体を形成するための方法であって、
分離トレンチにより取り囲まれた活性領域メサを有する半導体基板を準備するステップと、
第1応力を有する第1分離領域を前記分離トレンチに形成するステップと、
前記第1応力とは異なる第2応力を有する第2分離領域を前記分離トレンチに形成するステップであって、前記第1分離領域及び前記第2分離領域は、前記活性領域メサに回転剪断応力をかけるような大きさにされ、そのように位置決めされる、ステップと、
を含む方法。 - 前記第1分離領域及び前記第2分離領域の一方だけが前記活性領域メサに接触する、請求項13に記載の方法。
- 前記第1分離領域及び前記第2分離領域の両方が前記活性領域メサに接触する、請求項13に記載の半導体構造体。
- 前記回転剪断応力は時計回り方向である、請求項13に記載の半導体構造体。
- 前記回転剪断応力は反時計回り方向である、請求項13に記載の半導体構造体。
- 前記第1分離領域及び前記第2分離領域を形成するときに、
前記分離トレンチは完全に第1分離材料により充填され、
前記第1分離材料の一部は、ボイド及び第1分離領域を形成するように除去され、
前記第2分離領域が前記ボイドに形成される
請求項13に記載の方法。 - 前記第2分離領域は、
前記ボイドをシリコン材料により充填するステップと、
シリコン酸化物材料を形成するように前記シリコン材料を酸化させるステップと
により形成される、請求項18に記載の方法。 - 前記シリコン材料は、アモルファス・シリコン材料及びポリシリコン材料からなる群から選択される、請求項19に記載の方法。
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US11/164,179 US7348638B2 (en) | 2005-11-14 | 2005-11-14 | Rotational shear stress for charge carrier mobility modification |
PCT/EP2006/066992 WO2007054405A1 (en) | 2005-11-14 | 2006-10-03 | Rotational shear stress for charge carrier mobility modification |
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EP (1) | EP1949429B1 (ja) |
JP (1) | JP4629781B2 (ja) |
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ATE453927T1 (de) | 2010-01-15 |
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US7504697B2 (en) | 2009-03-17 |
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