JP6661283B2 - クリーニング方法及びプラズマ処理方法 - Google Patents
クリーニング方法及びプラズマ処理方法 Download PDFInfo
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- JP6661283B2 JP6661283B2 JP2015098867A JP2015098867A JP6661283B2 JP 6661283 B2 JP6661283 B2 JP 6661283B2 JP 2015098867 A JP2015098867 A JP 2015098867A JP 2015098867 A JP2015098867 A JP 2015098867A JP 6661283 B2 JP6661283 B2 JP 6661283B2
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Description
まず、本発明の一実施形態に係るエッチング装置1について、図1を参照して説明する。図1は、本実施形態に係るエッチング装置1の縦断面の一例を示す。本実施形態に係るエッチング装置1は、処理容器10内に載置台20とガスシャワーヘッド25とを対向配置した平行平板型のプラズマ処理装置(容量結合型プラズマ処理装置)である。載置台20は、半導体ウェハ(以下、単に「ウェハW」という。)を保持する機能を有するとともに下部電極として機能する。ガスシャワーヘッド25は、ガスを処理容器10内にシャワー状に供給する機能を有するとともに上部電極として機能する。
本実施形態に係るエッチング装置1は、ウェハW上のMRAM素子をエッチングした後のクリーニングを複数のクリーニング工程に分けて順に実行することでエッチング時に処理容器10の内部に堆積した金属、カーボン、シリコンの反応生成物を効率よく除去する。
本実施形態にかかるクリーニング方法について、図4のフローチャートを参照しながら説明する。前提として本クリーニングの前にステップS10〜S14においてMRAMのエッチングが実行される。具体的には、ステップS10において製品用のウェハWが搬入され、ステップS12において炭化水素ガスを含むエッチングガスによりプラズマエッチングが実行され、ステップS14においてエッチング後のウェハWが搬出される。本実施形態にかかるクリーニング方法は、1枚又は複数枚の製品用のウェハWのエッチングが実行された後のエッチング装置1のクリーニングに使用される。
クリーニング工程では、まず、ステップS16にてダミーウェハが搬入される。次に、ステップS18にて、処理容器10内にN2(N2)ガス及びH2(H2)ガスを含むガスを供給し、窒素ガス及び水素ガスのプラズマを生成する。生成したプラズマのうちの主に水素ラジカルの作用によりカーボン含有堆積物を除去することができる。なお、本工程は、水素含有ガスを含むガスを供給し、水素含有ガスを含むガスから生成されたプラズマによりカーボン含有堆積物を除去する第1のクリーニング工程の一例である。
図4に戻り、ステップS20において制御部100が第1の終点を検出した場合、ステップS22に進み、第2のクリーニング工程が実行される。第2のクリーニング工程において処理容器10内にはアルゴンガスが供給され、アルゴンガスのプラズマの主にイオンのスパッタの作用により金属含有堆積物がたたき出され、処理容器10外に除去される。なお、本工程は、第1のクリーニング工程後に、不活性ガスを供給し、不活性ガスから生成されたプラズマにより金属含有堆積物を除去する第2のクリーニング工程の一例である。
図4に戻り、ステップS30に進み、第3のクリーニング工程が実行される。第3のクリーニング工程では、処理容器10内に四フッ化炭素(CF4)ガス及び酸素ガスを含むガスが供給され、四フッ化炭素ガス及び酸素ガスのプラズマが生成される。生成したプラズマのうちの主にフッ素系ラジカルの作用によりシリコン(シリコン酸化膜を含む)の堆積物が除去される。なお、本工程は、第2のクリーニング工程後に、フッ素含有ガス及び酸素含有ガスを含むガスを供給し、フッ素含有ガス及び酸素含有ガスを含むガスから生成されたプラズマによりシリコン含有堆積物を除去する第3のクリーニング工程の一例である。
図4に戻り、ステップS32において制御部100が第3の終点を検出した場合、ステップS34に進み、窒素ガス及び水素ガスを含むガスを供給し、第3のクリーニング工程で発生したフッ素系ガス及び酸素系ガスを処理容器外に除去する(シーズニング工程)。これにより、処理容器内の雰囲気を整え、本処理を終了する。
2:MRAM素子
3:下部電極層
4:ピン止め層
5:第2磁性層
6:絶縁層
7:第1磁性層
8:上部電極層
9:マスク
10:処理容器
12:金属積層膜
15:ガス供給源
20:載置台
25:ガスシャワーヘッド
32:第2高周波電源
34:第1高周波電源
100:制御部
103:フォーカスリング
106:静電チャック
108:発光センサ
Dp:堆積物
W:シリコン基板
Claims (10)
- 金属を含む膜をエッチングする基板処理装置をクリーニングする方法であって、
水素含有ガスを含むガスを供給し、該水素含有ガスを含むガスから生成されたプラズマによりカーボン含有堆積物を除去する第1のクリーニング工程と、
前記第1のクリーニング工程後に、不活性ガスを供給し、該不活性ガスから生成されたプラズマにより金属含有堆積物を除去する第2のクリーニング工程と、
前記第2のクリーニング工程後に、フッ素含有ガス及び酸素含有ガスを含むガスを供給し、該フッ素含有ガス及び酸素含有ガスを含むガスから生成されたプラズマによりシリコン含有堆積物を除去する第3のクリーニング工程と、
を有するクリーニング方法。 - 前記第3のクリーニング工程後に、水素含有ガスを含むガスを供給し、該水素含有ガスを含むガスから生成されたプラズマによりフッ素含有ガス及び酸素含有ガスを除去する第4のクリーニング工程を有する、
請求項1に記載のクリーニング方法。 - 前記第1のクリーニング工程においてCN(炭化窒素)の発光強度に基づき第1の終点検出を行った後に前記第2のクリーニング工程を開始する、
請求項1又は2に記載のクリーニング方法。 - 前記第2のクリーニング工程においてPt(白金)、Mg(マグネシウム)、Ta(タンタル)、Co(コバルト)及びRu(ルテニウム)の少なくともいずれかの発光強度に基づき第2の終点検出を行った後に前記第3のクリーニング工程を開始する、
請求項1〜3のいずれか一項に記載のクリーニング方法。 - 前記第3のクリーニング工程においてSi(シリコン)の発光強度に基づき第3の終点検出を行った後に前記第4のクリーニング工程を開始する、
請求項2に記載のクリーニング方法。 - 前記第1のクリーニング工程においてCN(炭化窒素)の発光強度に基づき第1の終点検出を行った後に前記第2のクリーニング工程を開始し、
前記第2のクリーニング工程においてPt(白金)、Mg(マグネシウム)、Ta(タンタル)、Co(コバルト)及びRu(ルテニウム)の少なくともいずれかの発光強度に基づき第2の終点検出を行った後に前記第3のクリーニング工程を開始し、
前記第3のクリーニング工程においてSi(シリコン)の発光強度に基づき第3の終点検出を行った後に前記第4のクリーニング工程を開始し、
前記第1の終点検出の時間、前記第2の終点検出の時間及び前記第3の終点検出の時間に基づき、クリーニング時間の自動制御を行う、
請求項2に記載のクリーニング方法。 - 前記第1のクリーニング工程前にダミーウェハを搬入し、
前記第2のクリーニング工程後に該ダミーウェハを搬出して新たなダミーウェハを搬入する、
請求項1〜6のいずれか一項に記載のクリーニング方法。 - 金属を含む膜をエッチングする基板処理装置をクリーニングする方法であって、
水素含有ガスを含むガスを供給し、該水素含有ガスを含むガスから生成されたプラズマによりカーボン含有堆積物をクリーニングする第1のクリーニング工程と、
前記第1のクリーニング工程後に、不活性ガスを供給し、該不活性ガスから生成されたプラズマにより金属含有堆積物をクリーニングする第2のクリーニング工程と、
を有するクリーニング方法。 - 前記第1のクリーニング工程においてCN(窒化炭素)の発光強度に基づき該第1のクリーニングの終点検出を行った後に前記第2のクリーニング工程を開始する、
請求項8に記載のクリーニング方法。 - 基板処理装置内にてエッチングガスにより金属を含む膜をエッチングする工程と、
前記基板処理装置内に水素含有ガスを含むガスを供給し、該水素含有ガスを含むガスから生成されたプラズマによりカーボン含有堆積物を除去し、前記基板処理装置の内部をクリーニングする第1のクリーニング工程と、
前記第1のクリーニング工程後に前記基板処理装置内に不活性ガスを供給し、該不活性ガスから生成されたプラズマにより金属含有堆積物を除去し、前記基板処理装置の内部をクリーニングする第2のクリーニング工程と、
前記第2のクリーニング工程後に前記基板処理装置内にフッ素含有ガス及び酸素含有ガスを含むガスを供給し、該フッ素含有ガス及び酸素含有ガスを含むガスから生成されたプラズマによりシリコン含有堆積物を除去し、前記基板処理装置の内部をクリーニングする第3のクリーニング工程と、
を有するプラズマ処理方法。
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| KR1020177029144A KR102366893B1 (ko) | 2015-05-14 | 2016-05-02 | 클리닝 방법 및 플라즈마 처리 방법 |
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| CN201680021741.5A CN107533970B (zh) | 2015-05-14 | 2016-05-02 | 清洁方法和等离子体处理方法 |
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