JP2017524268A - 半導体積層構造、これを用いた窒化物半導体層の分離方法及び装置 - Google Patents
半導体積層構造、これを用いた窒化物半導体層の分離方法及び装置 Download PDFInfo
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Abstract
Description
本発明による半導体積層構造、これを用いた窒化物半導体層の分離方法及び装置を用いれば、紫外線光検出器、弾性表面波素子、LED、LD、マイクロ波電子素子などを製造することができ、その素子を用いたモジュール、システムなどに拡張できる。さらに、自由起立の窒化物半導体基板を製造することもできる。その他の実施例の具体的事項は、詳細な説明及び図面に示されている。
図1の(a)を参照すれば、先ず基板10の上に犠牲層パターン20を形成する。犠牲層パターン20の厚さdは、0.01〜10μmであり、犠牲層パターン20の幅wは、0.01〜10μmにすることができる。犠牲層パターン20の厚さdと幅wは、最終的に形成しようとする空洞を考慮して決定する。図1の(a)を参照すれば、犠牲層パターン20は、基板10全体に同一のパターンで均一に形成されている。しかし、犠牲層パターン20は、基板10に局部的に他のパターンで形成され得る。
基板10に形成する犠牲層パターン20は、ラインアンドスペースタイプ(line and space type)であって、基板10の上でy軸方向またはx軸方向へ延びる形状を有することができ、図2では、犠牲層パターン20がy軸方向へ延びる場合を例に挙げている。
実施例によっては、窒化物半導体層50が合体する前、図1を参照して説明した(e)段階で成長を終了することができる。すると、窒化物半導体層50は、相互分離した複数個の窒化物半導体層に形成される。
本発明による窒化物半導体層の分離方法は、本発明による半導体積層構造100、または、本発明のように、空洞を含む界面層が基板と窒化物半導体層との間に形成されている他の半導体積層構造の上面と下面に垂直方向への力を加えて分離する第1の方法と、水平方向への力を加えて分離する第2の方法、相対的な円運動の力を加えて分離する第3の方法が可能である。
実験過程は次のようである。図1を参照して説明したように、サファイア基板の上にラインアンドスペースタイプのPRパターンを形成した後、110℃でALDによってアルミナ薄膜を形成した。その後、空気中で熱処理を施すことでPRパターンを除去して空洞を形成し、アルミナ薄膜は結晶化させた。図14の(a)は、このような方法でサファイア基板の上に形成された空洞とアルミナ薄膜を示すSEM写真である。
Claims (27)
- 窒化物半導体とは異種の単結晶基板と、
前記基板との間に空洞が定義されるよう前記基板の上に形成され、少なくとも一部が前記基板と同一の結晶構造に結晶化した無機物薄膜と、
前記空洞の上における前記結晶化した無機物薄膜の上から成長した窒化物半導体層と、を含む半導体積層構造。 - 前記窒化物半導体層は、合体しているか、または合体していないことを特徴とする請求項1に記載の半導体積層構造。
- 前記窒化物半導体層は、水平方向へ連続または不連続であることを特徴とする請求項1に記載の半導体積層構造。
- 前記窒化物半導体層は、前記空洞の間の領域にボイドを形成することを特徴とする請求項1に記載の半導体積層構造。
- 前記無機物薄膜は、基板と接触する脚部及び脚部から延びた上面部を含むことを特徴とする請求項1に記載の半導体積層構造。
- 前記上面部は、前記基板と平行する面または曲面を有し、前記脚部は、前記基板と垂直するか、所定の傾斜を有するか、または曲面を有することを特徴とする請求項5に記載の半導体積層構造。
- 前記窒化物半導体層は、互いに分離した複数個の窒化物半導体層に形成されることを特徴とする請求項1に記載の半導体積層構造。
- 窒化物半導体とは異種の単結晶基板の上に犠牲層パターンを形成する段階と、
前記犠牲層パターンの上に無機物薄膜を形成する段階と、
前記基板と無機物薄膜とで定義される空洞が形成されるよう、前記無機物薄膜が形成された前記基板から前記犠牲層パターンを除去する段階と、
前記無機物薄膜の少なくとも一部を、前記基板と同一の結晶構造に結晶化させる段階と、
前記空洞の上における前記結晶化した無機物薄膜の上から窒化物半導体層を成長させる段階と、を含んで半導体積層構造を形成した後、
前記基板と前記窒化物半導体層とを機械的に分離する段階を含む窒化物半導体層の分離方法。 - 請求項1に記載の半導体積層構造において、基板と窒化物半導体層とを機械的に分離する段階を含む窒化物半導体層の分離方法。
- 前記窒化物半導体層を成長させる段階において、前記窒化物半導体層は、互いに分離した複数個の窒化物半導体層に形成することを特徴とする請求項8に記載の窒化物半導体層の分離方法。
- 前記機械的に分離する段階は、前記基板と窒化物半導体層に垂直方向への力を加えて分離する方法、水平方向への力を加えて分離する方法、相対的な円運動の力を加えて分離する方法、及びその組合せによる方法で行うことを特徴とする請求項8または請求項9に記載の窒化物半導体層の分離方法。
- 前記基板及び窒化物半導体層が垂直方向へ押圧される厚さまたは圧力を感知することで終点を検出することを特徴とする請求項11に記載の窒化物半導体層の分離方法。
- 前記基板と窒化物半導体層との分離後、前記分離した窒化物半導体層を他の基板に転写またはパッケージングする段階をさらに含むことを特徴とする請求項11に記載の窒化物半導体層の分離方法。
- 請求項1に記載の半導体積層構造、または基板と窒化物半導体層との間に空洞を含む界面層が含まれた他の半導体積層構造において、前記基板と窒化物半導体層とを機械的に分離する段階を行うことを特徴とする窒化物半導体層の分離装置。
- 前記半導体積層構造の基板と窒化物半導体層にそれぞれ適用される治具として、一対の板状分離部材を含むことを特徴とする請求項14に記載の窒化物半導体層の分離装置。
- 前記分離部材と前記半導体積層構造とは、一時的な接着となることを特徴とする請求項15に記載の窒化物半導体層の分離装置。
- 前記一時的な接着は、接着層、接着コーティング、接着テープ、静電気的な力または真空による力のうちいずれか一つによって行われることを特徴とする請求項16に記載の窒化物半導体層の分離装置。
- 前記分離部材のうち少なくともいずれか一つには装着溝が形成され、前記装着溝を介して前記半導体積層構造を吸着するための真空力を提供するように真空供給孔がさらに形成されていることを特徴とする請求項15に記載の窒化物半導体層の分離装置。
- 前記半導体積層構造に外力を印加する駆動部と、
前記駆動部を制御する制御部と、を含むことを特徴とする請求項14に記載の窒化物半導体層の分離装置。 - 前記駆動部は、前記基板及び窒化物半導体層に、相対的な押圧、引張り、せん断、捻りまたはその組合せによる外力を印加することを特徴とする請求項19に記載の窒化物半導体層の分離装置。
- 前記半導体積層構造の基板及び窒化物半導体層にそれぞれ適用される治具としての一対の板状分離部材の少なくともいずれか一方が、前記半導体積層構造と一時的接着をなした状態で、前記外力を印加することを特徴とする請求項20に記載の窒化物半導体層の分離装置。
- 前記分離部材のいずれか一方は固定し、他方を、一方に対して垂直方向、水平方向、または回転駆動させることで発生する外力を印加することを特徴とする請求項21に記載の窒化物半導体層の分離装置。
- 前記分離部材のいずれか一方は固定し、他方を、一方に対して垂直方向へ駆動させることで押圧力を提供し、無機物薄膜または界面層の破壊により前記窒化物半導体層と基板とが分離した直後に押圧力を解除することを特徴とする請求項21に記載の窒化物半導体層の分離装置。
- 前記制御部は、前記窒化物半導体層と基板とが分離する終点検出によって前記駆動部を制御することで、前記分離部材の相対的移動を停止するか、または相互離隔させることを特徴とする請求項23に記載の窒化物半導体層の分離装置。
- 前記終点検出のための分離感知部をさらに含むことを特徴とする請求項24に記載の窒化物半導体層の分離装置。
- 前記分離感知部は、分離部材間の距離測定または圧力モニタリングするものであることを特徴とする請求項25に記載の窒化物半導体層の分離装置。
- 前記分離した窒化物半導体層を他の基板に転写またはパッケージングするための移送装置をさらに含むことを特徴とする請求項14に記載の窒化物半導体層の分離装置。
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