JP7149890B2 - 成膜方法及び成膜装置 - Google Patents
成膜方法及び成膜装置 Download PDFInfo
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Description
一実施形態の成膜方法について説明する。図1は、一実施形態の成膜方法を示すフローチャートである。
基板を準備する工程S10では、非晶質シリコン膜を形成する基板を準備する。基板としては、表面が平滑な基板であってもよく、表面にトレンチ、ホール等の凹部が形成されている基板であってもよい。基板は、例えばシリコン基板等の半導体基板であってよい。また、基板の表面には、例えばシリコン酸化膜(SiO2膜)、シリコン窒化膜(SiN膜)等の絶縁膜が形成されていてもよい。
シード層を形成する工程S20では、基板にシード層用のシリコン原料ガスを供給して基板の上にシード層を形成する。図2は、シード層を形成する工程S20における温度制御の一例を示す図である。図2中、横軸は時間を示し、縦軸は設定温度を示す。図2に示されるように、シード層を形成する工程S20は、第1昇温ステップS21と、降温ステップS22と、第2昇温ステップS23と、定温ステップS24と、を有する。
第1の温度T1:430~530℃(中心温度:480℃)
第2の温度T2:390~490℃(中心温度:440℃)
第3の温度T3:420~520℃(中心温度:470℃)
(非晶質シリコン膜を形成する工程S30)
非晶質シリコン膜を形成する工程S30では、基板にシリコン原料ガスを供給してシード層の上に非晶質シリコン膜を形成する。一実施形態では、例えば化学気相堆積(CVD:Chemical Vapor Deposition)法により、基板を所定温度(例えば、400~550℃)に加熱した状態でシリコン原料ガスを供給してシード層の上に非晶質シリコン膜をコンフォーマルに成膜する。非晶質シリコン膜は、ノンドープシリコン膜であってもよく、不純物をドープしたシリコン膜であってもよい。不純物としては、例えばボロン(B)、リン(P)、ヒ素(As)、酸素(O)、炭素(C)が挙げられる。
上記の成膜方法を実施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。ただし、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。
次に、一実施形態の成膜方法の効果を確認するために行った実施例について説明する。
第1の温度T1:480℃
第2の温度T2:440℃
第3の温度T3:470℃
ハロゲン非含有シリコン原料ガス:SiH4ガス
ハロゲン含有シリコン原料ガス:DCSガス
34 処理容器
40 ガス供給部
42 加熱部
95 制御部
Claims (10)
- 処理容器内に収容された基板の温度を第1の温度から第2の温度に降温させながら、前記処理容器内にハロゲン非含有シリコン原料ガス及びハロゲン含有シリコン原料ガスを供給する降温ステップと、
前記降温ステップの後に行われ、前記基板の温度を第3の温度に維持しながら、前記処理容器内に前記ハロゲン非含有シリコン原料ガス及び前記ハロゲン含有シリコン原料ガスを供給する定温ステップと、
を有する、
成膜方法。 - 前記ハロゲン非含有シリコン原料ガス及び前記ハロゲン含有シリコン原料ガスは、前記基板の周囲から供給される、
請求項1に記載の成膜方法。 - 前記ハロゲン非含有シリコン原料ガス及び前記ハロゲン含有シリコン原料ガスは、前記基板の主面と略平行に供給される、
請求項1又は2に記載の成膜方法。 - 前記降温ステップでは、降温途中から前記処理容器内にハロゲン非含有シリコン原料ガス及びハロゲン含有シリコン原料ガスの供給を開始する、
請求項1乃至3のいずれか一項に記載の成膜方法。 - 前記降温ステップでは、降温開始と同時に前記処理容器内にハロゲン非含有シリコン原料ガス及びハロゲン含有シリコン原料ガスの供給を開始する、
請求項1乃至3のいずれか一項に記載の成膜方法。 - 前記第3の温度は、前記第2の温度以上、前記第1の温度以下である、
請求項1乃至5のいずれか一項に記載の成膜方法。 - 前記降温ステップの時間は、前記定温ステップの時間よりも短い、
請求項1乃至6のいずれか一項に記載の成膜方法。 - 前記基板の表面には、凹部が形成されている、
請求項1乃至7のいずれか一項に記載の成膜方法。 - 前記処理容器内には、複数の基板が上下方向に所定間隔を有して棚状に収容される、
請求項1乃至8のいずれか一項に記載の成膜方法。 - 基板を収容する処理容器と、
前記基板を加熱する加熱部と、
前記処理容器内にガスを供給するガス供給部と、
制御部と、
を備え、
前記制御部は、
前記基板の温度を第1の温度から第2の温度に降温させながら、前記処理容器内にハロゲン非含有シリコン原料ガス及びハロゲン含有シリコン原料ガスを供給する降温ステップと、
前記降温ステップの後に行われ、前記基板の温度を一定に制御しながら、前記処理容器内にハロゲン非含有シリコン原料ガス及びハロゲン含有シリコン原料ガスを供給する定温ステップと、
を実行するように前記加熱部及び前記ガス供給部を制御する、
成膜装置。
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