JP7073098B2 - ウエハ処理方法およびウエハ処理装置 - Google Patents
ウエハ処理方法およびウエハ処理装置 Download PDFInfo
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Description
すなわち、内電極22および外電極23へ供給される電圧(1301,1302)の値の低減が開始されて時間t7の後に、プラズマガスの供給(1308)が停止されると共にプラズマ電力(1309)の供給が停止される。時間t7の間にプラズマを用いたウエハ8の除電が行われる。プラズマ電力(1309)が停止されて時間t8の後に、内電極22及び外電極23への静電気力形成のための電圧(1301,1302)の印加が停止される。これにより、ウエハ8の除電が行われ、試料台7上部の静電チャック21上面からのウエハ8を脱離させることが可能となる。
〔変形例1〕
次に、本発明の第2の実施例の第1の変形例を、図20乃至図22を用いて説明する。図20は、本変形例に係る試料台7bの構成の概略を模式的に示す縦断面図である。本変形例におけるウエハ処理装置は、実施例2で説明したウエハ処理装置1501における試料台7aを、図20に示した試料台7bに置き換えたものであり、ウエハ処理装置のその他の部分の構成は、第2の実施例において図15乃至図17を用いて説明したウエハ処理装置1501の構成と同じであるので、説明を省略する。また、図20に示す試料台7bの構成は、実施例1で説明した図1に示すウエハ処理装置100の試料台7と置き換えて、実施例1のウエハ処理装置100にも適用可能である。
〔変形例2〕
第1の実施例で、図2に示した試料台7と同様の構成を備えた伝熱ガス排出路28を、図15乃至21に示した第2の実施例または第1の変形例に係るウエハ処理装置1501に用いることで、処理室内への伝熱ガスの流出が低減され、ウエハ8の処理の結果に対する伝熱ガスの影響が抑制され処理の歩留まりが向上する。この第2の変形例について、図22に示したタイムチャートを用いて説明する。
ウエハ8が第1の温度Te31に達したことが図示しない温度センサからの出力を受信した制御装置320(実際には、本変形例における制御装置は、実施例2で説明した制御装置320とは異なるが、便宜上、本変形例においても制御装置320として表記する)において検出されると、制御装置320からの指令信号に応じてプラズマ生成用の高周波電力(プラズマ電力:2208)が誘導コイル71に供給されプラズマ生成室66内の処理ガスの原子または分子からプラズマが生成される。
2 排気装置、
3 アース電極、
4 誘導コイル、
5 高周波電源、
6 アーム、
7,7a 試料台、
8 ウエハ、
9 冷媒供給装置、
10 高周波電源、
11 直流電源、
12 伝熱ガス供給装置、
20 電極ブロック、
21 静電チャック、
22 内電極、
23 外電極、
24 冷媒流路、
25 伝熱ガス供給路、
26 供給孔、
27 リング溝、
28 伝熱ガス排出路、
29 ガス排出装置、
30 検出孔、
31 圧力センサ、
32,320,321 制御装置、
35 流量調整弁、
61 処理容器、
62 圧力調整弁、
63 真空排気装置、
64 天板、
65 プラズマ輸送路、
66 プラズマ生成室、
67、69 弁、
68 処理ガス源、
70 クリーニングガス源、
71 誘導コイル、
72 高周波電源、
73 加熱ランプ、
74 反射板、
100,1501 ウエハ処理装置、
111,112 伝熱ガス供給装置、
113 ガス溜め、
114 圧力制御装置、
1502 加熱装置、
1575 反射部材、
1576 加熱ランプ、
1577 石英窓。
Claims (7)
- 内部に処理室を備えた真空容器と、
前記処理室内に配置された試料台と、
前記処理室の内部に処理ガスを供給する処理ガス供給部と、
前記処理ガス供給部により前記処理室の内部に導入された処理ガスを用いてプラズマを
形成する電界を供給するための高周波電源と、
前記試料台上に配置されて上面から熱伝達性を有する伝熱ガスを流出させる複数の開口
部が形成され、中央部が周辺部に対して凹状に形成されて前記周辺部に処理対象のウエハ
を載置して前記ウエハを静電気力により吸着する静電チャック部と、
前記静電チャック部の前記複数の開口部から流出させる前記伝熱ガスを供給する伝熱ガ
ス供給部と、
前記試料台の内部に形成された冷媒が通流する冷媒流路と接続して前記冷媒流路に冷媒
を供給する冷媒供給部と、
前記処理ガス供給部と前記高周波電源と前記静電チャック部と前記冷媒供給部とを制御す
る制御部と
を備えたプラズマ処理装置であって、
前記制御部は前記伝熱ガス供給部を制御して、前記静電チャック部の前記凹状に形成され
た中央部と前記静電チャック部に吸着された前記ウエハとの間に前記複数の開口部から流
出させて前記ウエハを前記静電チャック部から浮上させる前記伝熱ガスの流量または前記
伝熱ガスの種類を切替えることにより前記ウエハを処理する複数の工程に応じて前記ウエ
ハの温度を制御し、
前記制御部は、前記伝熱ガス供給部を制御して、前記静電チャック部の前記凹状に形成
された前記中央部と前記静電チャック部に載置された前記ウエハとの間に前記複数の開口
部から流出させて前記ウエハを前記静電チャック部から浮上させる前記伝熱ガスの流量を
切替えて前記ウエハの前記静電チャック部からの浮上量を前記ウエハを処理する前記複数
の工程に応じて変えることにより前記ウエハの温度を制御することを特徴とするウエハ処
理装置。 - 請求項1記載のウエハ処理装置において、
前記制御部は、前記伝熱ガス供給部を制御して、前記静電チャック部の前記凹状に形成
された前記中央部と前記静電チャック部に載置された前記ウエハとの間に前記複数の開口
部から流出させる前記伝熱ガスの種類を前記ウエハを処理する前記複数の工程に応じて切
替えることにより前記ウエハの温度を制御することを特徴とするウエハ処理装置。 - 真空容器内部の処理室内に配置された試料台に処理対象のウエハを載せて、高周波電源
から前記真空容器内に電界を供給して処理ガス供給部から前記真空容器内に導入された処
理ガスを用いてプラズマを形成し、前記試料台の内部に配置された冷媒流路に冷媒供給装
置から供給された冷媒を通流させつつ、前記試料台の上部に配置されて中央部が周辺部に
対して凹状に形成されて前記ウエハを静電気力により吸着する静電チャック部に前記ウエ
ハを載置し保持して前記静電チャック部の上面に配置された複数の開口部から前記ウエハ
と前記静電チャック部の前記凹状に形成された前記中央部との間に伝熱ガス供給部から熱
伝導性を有する伝熱ガスを供給しつつ複数の工程により前記ウエハを処理するウエハ処理
方法であって、
前記複数の工程において、制御部で前記伝熱ガス供給部を制御して、前記ウエハが静電
チャック部上に配置された状態で前記開口部から導入される前記伝熱ガスの量または圧力
を調節して前記ウエハの前記静電チャック部の上面との間の高さを前記複数の工程各々の
所定の値に調節することにより前記ウエハを処理する前記複数の工程に応じて前記ウエハ
の温度を制御しながら前記ウエハを処理し、
前記制御部で前記ウエハの温度を制御しながら前記ウエハを処理する前記複数の工程は
、前記高周波電源により前記電界を形成して前記処理室の内部に発生させた前記プラズマ
を用いて前記ウエハの表面に反応層を形成する工程と、加熱部で前記ウエハを加熱して前
記反応層を脱離させる工程であることを特徴とするウエハ処理方法。 - 請求項3記載のウエハ処理方法であって、
前記加熱部で前記ウエハを加熱して前記反応層を脱離させる工程において、前記加熱部
の第1の加熱ランプ部で前記静電チャック部に載置された前記ウエハを前記ウエハの上方
から加熱し、前記加熱部の第2の加熱ランプ部で前記静電チャック部に載置された前記ウ
エハを前記ウエハの外周部近傍を加熱することを特徴とするウエハ処理方法。 - 請求項3記載のウエハ処理方法であって、
前記制御部で前記伝熱ガス供給部を制御することが、前記制御部で前記伝熱ガス供給部の
流量調節器を制御して前記複数の工程の少なくとも一つの工程において前記ウエハが前記
静電チャック部の上面上方に浮上させ非接触に保持されるように前記伝熱ガスの量または
圧力を調節することを特徴とするウエハ処理方法。 - 請求項3記載のウエハ処理方法であって、
前記制御部で前記伝熱ガス供給部を制御して、前記静電チャック部の前記凹状に形成さ
れた前記中央部と前記静電チャック部に載置された前記ウエハとの間に前記複数の開口部
から流出させて前記ウエハを前記静電チャック部から浮上させる前記伝熱ガスの流量を切
替えて前記ウエハの前記静電チャック部からの浮上量を前記ウエハを処理する複数の工程
に応じて変えることにより前記ウエハの温度を制御することを特徴とするウエハ処理方法
。 - 請求項3に記載のウエハ処理方法であって、
前記制御部で前記伝熱ガス供給部を制御して、前記静電チャック部の前記凹状に形成さ
れた前記中央部と前記静電チャック部に載置された前記ウエハとの間に前記複数の開口部
から流出させる前記伝熱ガスの種類を前記ウエハを処理する前記複数の工程に応じて切替
えることにより前記ウエハの温度を制御することを特徴とするウエハ処理方法。
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