JP6919350B2 - 基板処理方法及び基板処理装置 - Google Patents
基板処理方法及び基板処理装置 Download PDFInfo
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- JP6919350B2 JP6919350B2 JP2017114467A JP2017114467A JP6919350B2 JP 6919350 B2 JP6919350 B2 JP 6919350B2 JP 2017114467 A JP2017114467 A JP 2017114467A JP 2017114467 A JP2017114467 A JP 2017114467A JP 6919350 B2 JP6919350 B2 JP 6919350B2
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Description
前記窒化シリコン膜の表面を酸化して酸化層を形成するための酸化ガスを前記基板に供給する酸化工程と、
前記被エッチング膜及び前記酸化層が前記基板の表面に露出した状態でハロゲンを含むエッチングガスを前記基板に供給し、当該被エッチング膜をエッチングするエッチング工程と、を備え、
前記酸化層を積層して形成するために、前記成膜工程及び酸化工程は繰り返し複数回行われることを特徴とする。
真空容器内に設けられ、前記基板を載置して公転させるための回転テーブルと、
前記回転テーブル上における第1の領域に、前記成膜用のガスでありシリコンを含む原料ガスを供給する原料ガス供給部と、
前記回転テーブル上において前記第1の領域に対して当該回転テーブルの回転方向に離れた第2の領域に、前記原料ガスを窒化して窒化シリコンを生成するための窒化ガスを供給する窒化ガス供給部と、
前記第1の領域の雰囲気と第2の領域の雰囲気とを分離するための分離機構と、
前記回転テーブル上に前記酸化ガスを供給する酸化ガス供給部と、
前記原料ガス及び前記窒化ガスが前記回転テーブル上に供給された状態で前記基板が前記第1の領域と前記第2の領域とを繰り返し複数回通過した後に、前記酸化ガスが前記回転テーブル上に供給されるステップが繰り返し行われ、前記酸化層が積層して形成されるように制御信号を出力する制御部と、
を備えることを特徴とする。
ところで、SiN膜13としては、例えばホウ素や炭素など、Si及びN以外の元素が添加されたものであってもよい。従って、当該SiN膜13を酸化して形成される酸化層14についても、これらホウ素や炭素を含んでいてもよい。
以下、本発明に関連して行われた評価試験について説明する。
・評価試験1
評価試験1として上記の成膜装置2を用いて、図9で説明したように各ガスの供給及びプラズマの形成を行い、ウエハWにSiN膜13を形成した。然る後、図10で説明したように各ガスの供給及びプラズマの形成を行い、SiN膜13の表面を酸化処理した。そして、SiMS(二次イオン質量分析法)により、ウエハWの表面からの各深さにおける酸素濃度を測定した。また比較試験1として、評価試験1と同様にSiN膜13を形成し、図10で説明した酸化処理を行わずに評価試験1と同様にSIMSを行い、酸素濃度を測定した。
評価試験2としてTiN膜12が表面に形成されたウエハWに、TiN膜12の一部のみが被覆されるように複数の試験片を置き、図11に示したものと同様のエッチング装置を用いて、TiN膜12が10nmエッチングされるようにプラズマエッチング処理を行い、各試験片のエッチング量を測定した。さらに、各試験片について、エッチング選択比を測定した。このエッチング選択比は、試験片のエッチング量/TiN膜12のエッチング量(=10nm)である。
評価試験3として、ウエハWにSiN膜13、酸化層14の形成を行い、評価試験2で説明したエッチングを行った。このエッチングを行う前、行った後で夫々TEM(透過型電子顕微鏡)により、ウエハWの縦断側面を撮像した。また、比較試験3として、ウエハWにSiN膜13の形成を行い、酸化層14を形成せずに評価試験2で説明したエッチングを行った。この比較試験3においてもエッチングの前後で夫々TEMによりウエハWの縦断側面を撮像した。
12 TiN膜
13 SiN膜
14 酸化層
2 成膜装置
20 制御部
21 真空容器
22 回転テーブル
3 ガス給排気ユニット
4A〜4C プラズマ形成ユニット
51〜53 ガスインジェクター
Claims (7)
- 基板に成膜用のガスを供給し、被エッチング膜に対して積層される窒化シリコン膜を形成する成膜工程と、
前記窒化シリコン膜の表面を酸化して酸化層を形成するための酸化ガスを前記基板に供給する酸化工程と、
前記被エッチング膜及び前記酸化層が前記基板の表面に露出した状態でハロゲンを含むエッチングガスを前記基板に供給し、当該被エッチング膜をエッチングするエッチング工程と、を備え、
前記酸化層を積層して形成するために、前記成膜工程及び酸化工程は繰り返し複数回行われることを特徴とする基板処理方法。 - 前記窒化シリコン膜は、前記被エッチング膜をエッチングするためのマスクであることを特徴とする請求項1記載の基板処理方法。
- 前記エッチングガスは、塩素系ガスであることを特徴とする請求項1または2記載の基板処理方法。
- 前記被エッチング膜は窒化チタン膜であることを特徴とする請求項1ないし3のいずれか一つに記載の基板処理方法。
- 前記酸化ガスは酸素ガスであり、
前記酸化工程は、プラズマ化した前記酸素ガスを前記基板に供給する工程を含むことを特徴とする請求項1ないし4のいずれか一つに記載の基板処理方法。 - 請求項1ないし5のいずれか一つに記載の基板処理方法を実行するために前記成膜工程、前記酸化工程、前記エッチング工程のうち、前記成膜工程及び前記酸化工程のみ行う基板処理装置において、
真空容器内に設けられ、前記基板を載置して公転させるための回転テーブルと、
前記回転テーブル上における第1の領域に、前記成膜用のガスでありシリコンを含む原料ガスを供給する原料ガス供給部と、
前記回転テーブル上において前記第1の領域に対して当該回転テーブルの回転方向に離れた第2の領域に、前記原料ガスを窒化して窒化シリコンを生成するための窒化ガスを供給する窒化ガス供給部と、
前記第1の領域の雰囲気と第2の領域の雰囲気とを分離するための分離機構と、
前記回転テーブル上に前記酸化ガスを供給する酸化ガス供給部と、
前記原料ガス及び前記窒化ガスが前記回転テーブル上に供給された状態で前記基板が前記第1の領域と前記第2の領域とを繰り返し複数回通過した後に、前記酸化ガスが前記回転テーブル上に供給されるステップが繰り返し行われ、前記酸化層が積層して形成されるように制御信号を出力する制御部と、
を備えることを特徴とする基板処理装置。 - 前記回転テーブル上に供給された前記酸化ガスをプラズマ化して前記基板に供給するためのプラズマ化機構が設けられていることを特徴とする請求項6記載の基板処理装置。
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