JP2014527709A - エピタキシャル半導体構造の成長基板からエピタキシャル膜又はエピタキシャル膜層をレーザ分離する方法 - Google Patents
エピタキシャル半導体構造の成長基板からエピタキシャル膜又はエピタキシャル膜層をレーザ分離する方法 Download PDFInfo
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- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 claims description 66
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Abstract
Description
202 ホモエピタキシャル膜
203 レーザビーム
205、405、505 ホモエピタキシャル界面
402 上部層
406 下部層
Claims (20)
- エピタキシャル半導体構造の成長基板からエピタキシャル膜又はエピタキシャル膜層をレーザ分離する方法であって、
エピタキシャル膜又はエピタキシャル膜層を成長させる際に微小ドナー又はアクセプタ不純物でのエピタキシャル構造の一部領域の選択的ドーピングを用いて、結果として選択的にドープされた領域における微小不純物の濃度がドープされていない領域におけるバックグラウンド濃度を実質的に超えるようにするステップと、
集束レーザビームをエピタキシャル構造に向けて、レーザ放射の吸収が生じるエピタキシャル構造の選択的にドープされた領域にビーム焦点を位置付けるステップと、
エピタキシャル構造の選択的にドープされた領域をビーム焦点で走査するようにレーザビームを移動させて、選択的にドープされた領域を部分的に熱分解してその機械的強度を弱めるステップと、
レーザ走査後に、エピタキシャル構造を一時的な基板に貼り付けて、機械的又は熱機械的応力を印加することによって、成長基板から、又はエピタキシャル膜の一部を有する成長基板からエピタキシャル膜又はエピタキシャル膜層を分離するステップとを備えることを特徴とする方法。 - エピタキシャル膜又はエピタキシャル膜層をホモエピタキシ法によって成長させることを特徴とする請求項1に記載の方法。
- 選択的にドープされた領域が基板、又は基板の表面層であることを特徴とする請求項1に記載の方法。
- 選択的にドープされた領域がエピタキシャル膜、又はエピタキシャル膜の下部層であることを特徴とする請求項1に記載の方法。
- エピタキシャル半導体構造の物質が、周期表の第4族の元素の半導体であることを特徴とする請求項1に記載の方法。
- エピタキシャル半導体構造の物質が、周期表の第4族の元素の半導体化合物であることを特徴とする請求項1に記載の方法。
- エピタキシャル半導体構造の物質が、周期表の第3族及び第5族の元素の半導体化合物であることを特徴とする請求項1に記載の方法。
- エピタキシャル半導体構造の物質が、周期表の第2族及び第6族の元素の半導体化合物であることを特徴とする請求項1に記載の方法。
- 成長基板からホモエピタキシャル膜を分離するために、シリコン、ゲルマニウム、及びヒ化ガリウム半導体に対して6μm≦λ≦48μmの波長範囲内、窒化ガリウムに対して4μm≦λ≦32μmの波長範囲内、炭化シリコンに対して3μm≦λ≦24μmの波長範囲内、窒化アルミニウムに対して2.5μm≦λ≦20μmの波長範囲内、ダイヤモンドに対して2μm≦λ≦16μmの波長範囲内の波長を有するレーザを用いることを特徴とする請求項1に記載の方法。
- レーザとして赤外線ガスパルスポンプCO2又はCOレーザを用いることを特徴とする請求項1に記載の方法。
- エピタキシャル半導体構造の成長基板からエピタキシャル膜又はエピタキシャル膜層をレーザ分離する方法であって、
エピタキシャル膜又はエピタキシャル膜層を成長させる際に微小ドナー又はアクセプタ不純物でのエピタキシャル構造の一部領域の選択的ドーピングを用いて、結果としての選択的にドープされた領域における微小不純物の濃度がドープされていない領域のバックグラウンド濃度を超えるようにするステップと、
エピタキシャル構造を一時的な基板に貼り付けるステップと、
エピタキシャル構造に集束レーザビームを向けて、レーザ放射の吸収が生じるエピタキシャル構造の選択的にドープされた領域にビーム焦点を位置付けるステップと、
エピタキシャル構造の選択的にドープされた領域をビーム焦点で走査するようにレーザビームを移動させて、選択的にドープされた領域を部分的に熱分化してその機械的強度を弱めるステップと、
機械的又は熱機械的応力を印加することによって、成長基板から、又はエピタキシャル膜の一部を有する成長基板からエピタキシャル膜又はエピタキシャル膜層を分離するステップとを備えることを特徴とする方法。 - エピタキシャル膜又はエピタキシャル膜層をホモエピタキシ法によって成長させることを特徴とする請求項11に記載の方法。
- 選択的にドープされた領域が基板、又は基板の表面層であることを特徴とする請求項11に記載の方法。
- 選択的にドープされた領域がエピタキシャル膜、又はエピタキシャル膜の下部層であることを特徴とする請求項11に記載の方法。
- エピタキシャル構造の物質が、周期表の第4族の元素の半導体であることを特徴とする請求項11に記載の方法。
- エピタキシャル構造の物質が、周期表の第4族の元素の半導体化合物であることを特徴とする請求項11に記載の方法。
- エピタキシャル構造の物質が、周期表の第3族及び第5族の元素の半導体化合物であることを特徴とする請求項11に記載の方法。
- エピタキシャル構造の物質が、周期表の第2族及び第6族の元素の半導体化合物であることを特徴とする請求項11に記載の方法。
- 成長基板からホモエピタキシャル膜を分離するために、シリコン、ゲルマニウム、及びヒ化ガリウム半導体に対して6μm≦λ≦48μmの波長範囲内、窒化ガリウムに対して4μm≦λ≦32μmの波長範囲内、炭化シリコンに対して3μm≦λ≦24μmの波長範囲内、窒化アルミニウムに対して2.5μm≦λ≦20μmの波長範囲内、ダイヤモンドに対して2μm≦λ≦16μmの波長範囲内の波長を有するレーザを用いることを特徴とする請求項11に記載の方法。
- レーザとして赤外線ガスパルスポンプCO2又はCOレーザを用いることを特徴とする請求項11に記載の方法。
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EP2732461A1 (en) | 2014-05-21 |
US9337025B2 (en) | 2016-05-10 |
CN103703552B (zh) | 2018-04-24 |
RU2469433C1 (ru) | 2012-12-10 |
WO2013009222A1 (en) | 2013-01-17 |
US20160172228A1 (en) | 2016-06-16 |
JP6193228B2 (ja) | 2017-09-06 |
US9966296B2 (en) | 2018-05-08 |
EP2732461B1 (en) | 2019-02-20 |
CN103703552A (zh) | 2014-04-02 |
US20140206178A1 (en) | 2014-07-24 |
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