JP7200880B2 - 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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- JP7200880B2 JP7200880B2 JP2019149953A JP2019149953A JP7200880B2 JP 7200880 B2 JP7200880 B2 JP 7200880B2 JP 2019149953 A JP2019149953 A JP 2019149953A JP 2019149953 A JP2019149953 A JP 2019149953A JP 7200880 B2 JP7200880 B2 JP 7200880B2
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45523—Pulsed gas flow or change of composition over time
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/34—Nitrides
- C23C16/345—Silicon nitride
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Description
前記基板にプラズマ化した水素ガスを供給する工程と、
前記基板にハロゲン化シリコンにより構成される処理ガスを供給する工程と、
前記プラズマ化した水素ガスを供給する工程と前記処理ガスを供給する工程とを交互に繰り返し行い、前記第1の膜及び前記第2の膜を被覆するシリコンの薄層を形成する工程と、
前記シリコンの薄層を窒化する第2の窒化ガスを前記基板に供給して、窒化シリコンの薄層を形成する工程と、
前記原料ガスと、前記第1の窒化ガスとを前記基板に供給して、前記窒化シリコンの薄層上に前記窒化シリコン膜を成膜する工程と、
を備える。
(評価試験1)
評価試験1として、Siにより構成されると共に表面が剥き出しの状態のウエハ(ベアウエハ)と、Siにより構成されると共に表面にSiO2膜が形成されたウエハ(SiO2ウエハとする)と、を複数枚ずつ用意した。そして、上記の実施形態で説明したステップS1~S3からなる一連の処理(前処理及びSiN膜68の成膜処理)を、ベアウエハ、SiO2ウエハに夫々行った。この一連の処理におけるステップS3のSiN膜68の成膜処理の時間は、180秒または360秒に設定した。一連の処理の終了後は、形成されたSiN膜68の膜厚を測定した。
評価試験2として、評価試験1と同様にベアウエハ、SiO2ウエハに各々上記のステップS1~S3からなる処理を行い、SiN膜68の膜厚を取得した。そして、図12で説明したようにSiN膜68の膜厚をグラフにプロットし、各プロットを結ぶ直線の延長線より、インキュベーションタイムを取得した。また、膜厚差(ベアウエハのSiN膜68の膜厚-SiO2ウエハのSiN膜68の膜厚)を算出した。
1 成膜装置
10 制御部
12 回転テーブル
2 シャワーヘッド
3A~3C プラズマ形成ユニット
61 Si膜
62、64 SiO2膜、SiO2膜
63 W膜
66 Siの薄層
67 SiNの薄層
68 SiN膜
Claims (8)
- シリコンを含む原料ガスと前記シリコンを窒化する第1の窒化ガスとを供給したときに、窒化シリコン膜の成長が開始されるまでに要するインキュベーションタイムが互いに異なる第1の膜及び第2の膜を表面に備える基板に、当該窒化シリコン膜を成膜する成膜方法において、
前記基板にプラズマ化した水素ガスを供給する工程と、
前記基板にハロゲン化シリコンにより構成される処理ガスを供給する工程と、
前記プラズマ化した水素ガスを供給する工程と前記処理ガスを供給する工程とを交互に繰り返し行い、前記第1の膜及び前記第2の膜を被覆するシリコンの薄層を形成する工程と、
前記シリコンの薄層を窒化する第2の窒化ガスを前記基板に供給して、窒化シリコンの薄層を形成する工程と、
前記原料ガスと、前記第1の窒化ガスとを前記基板に供給して、前記窒化シリコンの薄層上に前記窒化シリコン膜を成膜する工程と、
を備える成膜方法。 - 前記処理ガスを構成するハロゲン化シリコンは、シリコンの塩化物である請求項1記載の成膜方法。
- 前記シリコンの塩化物は、六塩化二シリコンである請求項2記載の成膜方法。
- 前記第2の窒化ガスは、プラズマ化したアンモニアガスである請求項1ないし3のいずれか一つに記載の成膜方法。
- 前記第1の膜はシリコン膜であり、前記第2の膜は酸化シリコン膜あるいは金属膜を含む請求項1ないし4のいずれか一つに記載の成膜方法。
- 前記第2の膜は金属膜を含み、当該金属膜はタングステン膜である請求項5記載の成膜方法。
- シリコンを含む原料ガスと前記シリコンを窒化する第1の窒化ガスとを供給したときに、窒化シリコン膜の成長が開始されるまでに要するインキュベーションタイムが互いに異なる第1の膜及び第2の膜を表面に備える基板に、当該窒化シリコン膜を成膜する成膜装置において、
前記基板を載置して公転させる回転テーブルと、
前記回転テーブル上にプラズマ化した水素ガスを供給する水素ガス供給部と、
前記回転テーブル上にハロゲン化シリコンにより構成される処理ガスを供給する処理ガス供給部と、
前記回転テーブル上に第1の窒化ガス、第2の窒化ガスを各々供給する窒化ガス供給部と、
前記回転テーブル上に前記原料ガスを供給する原料ガス供給部と、
前記第1の膜及び前記第2の膜を被覆するシリコンの薄層を形成するために、公転する前記基板に前記プラズマ化した水素ガスと前記処理ガスとを交互に繰り返し供給するステップと、前記シリコンの薄層を窒化して窒化シリコンの薄層を形成するために、公転する前記基板に前記第2の窒化ガスを供給するステップと、前記窒化シリコンの薄層上に前記窒化シリコン膜を成膜するために、公転する前記基板に前記原料ガスと前記第1の窒化ガスとを交互に繰り返し供給するステップと、を行うように構成された制御部と、
を備える成膜装置。 - 前記回転テーブル上の第1の領域にガスを供給する第1のガス供給部と、
前記回転テーブル上の前記第1の領域に対して当該回転テーブルの回転方向に離れ、且つ雰囲気が分離された第2の領域にガスを供給すると共に当該ガスをプラズマ化する第2のガス供給部と、
が設けられ、
前記原料ガス供給部及び前記処理ガス供給部は前記第1のガス供給部であり、
前記第1の窒化ガス及び前記第2の窒化ガスはプラズマ化された窒化ガスであり、前記窒化ガス供給部及び前記水素ガス供給部は前記第2のガス供給部である請求項7記載の成膜装置。
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