JP7190875B2 - ポリシリコン膜の形成方法及び成膜装置 - Google Patents
ポリシリコン膜の形成方法及び成膜装置 Download PDFInfo
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- JP7190875B2 JP7190875B2 JP2018215345A JP2018215345A JP7190875B2 JP 7190875 B2 JP7190875 B2 JP 7190875B2 JP 2018215345 A JP2018215345 A JP 2018215345A JP 2018215345 A JP2018215345 A JP 2018215345A JP 7190875 B2 JP7190875 B2 JP 7190875B2
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Description
一実施形態のポリシリコン膜の形成方法について説明する。図1は、ポリシリコン膜の形成方法の一例を示す工程断面図である。
上記のポリシリコン膜の形成方法を実施することができる成膜装置について、多数枚の基板に対して一括で熱処理を行うバッチ式の縦型熱処理装置を例に挙げて説明する。但し、成膜装置は、バッチ式の装置に限定されるものではなく、例えば基板を1枚ずつ処理する枚葉式の装置であってもよい。
実施例1では、基板の上に形成されたアモルファスシリコン膜上にアモルファスゲルマニウム膜を形成し、基板を450℃、550℃で4時間熱処理した試料を作製した。また、比較のために、基板の上に形成されたアモルファスシリコン膜上にアモルファスゲルマニウム膜を形成することなく、基板を450℃、550℃で4時間熱処理した試料を作製した。そして、作製したそれぞれの試料について、斜入射X線回折(GIXRD:Grazing Incident X-ray Diffraction)法により、結晶状態を評価した。評価結果を図4及び図5に示す。
実施例2では、基板の上にアモルファスシリコン膜を形成し、その上にアモルファスゲルマニウム膜を形成し、525℃で4時間熱処理した後、アモルファスゲルマニウム膜を除去し、750℃で4時間熱処理した試料を作製した。また、比較のために、基板の上にアモルファスシリコン膜を形成した後、アモルファスゲルマニウム膜を形成することなく、750℃で4時間熱処理した試料を作製した。そして、作製したそれぞれの試料について、GIXRD法により、結晶状態を評価した。評価結果を図6に示す。
34 反応管
40 ガス供給手段
41 排気手段
42 加熱手段
95 制御手段
Claims (7)
- 基板の上にアモルファスシリコン膜を形成する工程と、
前記アモルファスシリコン膜上にアモルファスゲルマニウム膜又はアモルファスシリコンゲルマニウム膜により形成されたキャップ層を形成する工程と、
前記基板を第1の温度で熱処理して前記アモルファスシリコン膜中にシリコンの結晶核を形成する工程と、
前記結晶核を形成した後、前記キャップ層を除去する工程と、
前記キャップ層が除去された前記基板を前記第1の温度以上の第2の温度で熱処理して前記結晶核を成長させる工程と、
を有し、
前記結晶核を形成する工程において、前記アモルファスシリコン膜の大部分はアモルファス(非晶質)の状態を維持したまま前記アモルファスシリコン膜の一部を結晶化して結晶核を形成し、
前記結晶核を成長させる工程において、前記結晶核を起点として前記アモルファスシリコン膜の大部分を結晶化する、
ポリシリコン膜の形成方法。 - 前記キャップ層を形成する工程は、前記アモルファスシリコン膜を形成する工程の後、前記基板を大気に曝露することなく連続して行われる、
請求項1に記載のポリシリコン膜の形成方法。 - 前記第2の温度は、前記第1の温度よりも高い、
請求項1又は2に記載のポリシリコン膜の形成方法。 - 前記第1の温度は、450℃~550℃である、
請求項1乃至3のいずれか一項に記載のポリシリコン膜の形成方法。 - 前記キャップ層を除去する工程は、前記キャップ層を希フッ酸でエッチングした後、前記キャップ層を過酸化水素水でエッチングする工程である、
請求項1乃至4のいずれか一項に記載のポリシリコン膜の形成方法。 - 前記アモルファスシリコン膜を形成する工程の前に、前記基板の上にシード層を形成する工程を有する、
請求項1乃至5のいずれか一項に記載のポリシリコン膜の形成方法。 - 基板を収容する処理容器と、
前記処理容器内にシリコン原料ガス、ゲルマニウム原料ガス及びエッチングガスを供給する供給部と、
前記処理容器内を排気する排気部と、
前記基板を加熱する加熱部と、
制御部と、
を有し、
前記制御部は、
前記処理容器内に前記シリコン原料ガスを供給して前記基板の上にアモルファスシリコン膜を形成する工程と、
前記処理容器内に前記ゲルマニウム原料ガスを供給して前記アモルファスシリコン膜上にアモルファスゲルマニウム膜を形成する、又は前記処理容器内に前記シリコン原料ガス及び前記ゲルマニウム原料ガスを供給して前記アモルファスシリコン膜上にアモルファスシリコンゲルマニウム膜を形成することによりキャップ層を形成する工程と、
前記アモルファスシリコン膜を第1の温度で熱処理して前記アモルファスシリコン膜中にシリコンの結晶核を形成する工程と、
前記結晶核を形成した後、前記キャップ層を除去する工程と、
前記キャップ層が除去された前記基板を前記第1の温度以上の第2の温度で熱処理して前記結晶核を成長させる工程と、
を実行するように前記供給部、前記排気部及び前記加熱部を制御するよう構成され、
前記結晶核を形成する工程において、前記アモルファスシリコン膜の大部分はアモルファス(非晶質)の状態を維持したまま前記アモルファスシリコン膜の一部を結晶化して結晶核を形成し、
前記結晶核を成長させる工程において、前記結晶核を起点として前記アモルファスシリコン膜の大部分を結晶化する、
成膜装置。
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