JP2018139256A - 成膜装置 - Google Patents
成膜装置 Download PDFInfo
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Abstract
Description
本発明の発明者は、より安定にプラズマを形成しつつ、プラズマ形成部を昇降させることが可能な技術を開発している。
分離領域を介して前記回転テーブルの周方向に互いに離間した第1の処理領域、第2の処理領域に、夫々第1の処理ガス、第2の処理ガスを供給するための第1の処理ガス供給部及び第2の処理ガス供給部と、
基板に対してプラズマ処理を行うために、前記真空容器内にプラズマ発生用ガスを供給するプラズマ発生用ガス供給部と、
前記プラズマ発生用ガスをプラズマ化するためのプラズマ形成部と、
前記真空容器の天井部側に設けられた開口部に挿入され、前記回転テーブルの上面と対向する底面部を備えると共に、前記底面部の上面側に前記プラズマ形成部を収容した収容容器と、
前記収容容器と前記真空容器の開口部の内周面との間に配置され、当該内周面の周方向に沿って環状に設けられた誘電体製のシールド部材と、
前記真空容器内に挿入された前記収容容器の底面部の配置高さ位置を調節するための高さ調節部と、
前記真空容器と前記開口部に挿入された収容容器との間を気密に塞ぐためのシール部と、を備えたことを特徴とする。
また、スリーブ141の上端部には、回転テーブル2の上面側から下面側への原料ガスや酸化ガスなどの回りこみを防ぐために、スリーブ141や容器本体13の開口部14と、回転軸21との隙間にN2(窒素)ガスを供給するガス供給管15が設けられている。
ヒーター32が配置された凹部31の上面は、例えば石英からなる円環状の板部材である蓋体33によって塞がれている。
なお本説明において、所定の基準位置から回転テーブル2の回転方向に沿った方向を回転方向の下流側、これと反対の方向を上流側という。
本実施の形態において、吸着領域R1は第1の処理領域に相当し、第1、酸化領域R2は、第2の処理領域に相当している。
カップ状に形成された収容容器42の底面部をプラズマ窓421と呼ぶと、図3や分解斜視図である図4に示すように、このプラズマ窓421の上面側には、上面側が開口する箱型のファラデーシールド92が配置されている。ファラデーシールド92は、収容容器42の上面に架け渡された枠状体91を介して収容容器42に支持されている。ファラデーシールド92の底面には、絶縁板93が配置され、その上面側にプラズマ形成部8が収容されている。
例えば図5は、回転テーブル2とプラズマ窓421との間の距離(図5中には「アンテナギャップ」と記してある)を変化させてSiO2膜を成膜し、希フッ酸(DHF)を用いて成膜後のSiO2膜をウェットエッチングしたときのエッチング速度の変化を示している。
また、ウエハWの表面に形成されたパターン上に成膜を行う場合、寿命の短いイオンは、上部側の領域で反応が進行しやすく、下部側の領域では上方領域と比較して反応が進行しにくいという傾向もみられる。この結果、パターンの上部側が緻密で硬く、下部側が柔らかい特性分布を持った膜が成膜される傾向がある。
またウエハWの表面に形成されたパターン上に成膜を行う場合、相対的に寿命が長いラジカルは、パターン内にも進入し易く、イオンが多い場合と比較して、パターンの上部側、下部側で均質なプラズマ処理が行われる傾向もある。
以下、図3、4等を参照しながらプラズマ窓421の配置高さ位置を変更する機能について説明する。
突出部411は、シールド部材41によって囲まれた空間(プラズマ形成領域R3に対応している)内に供給されたプラズマ発生用ガスの濃度低下を抑制すると共に、当該空間の外部に供給されたN2ガスやオゾンガスの進入を抑える役割を果たす。
初めに成膜装置1は、真空容器11内の圧力及びヒーター32の出力をウエハWの搬入時の状態に調節して、ウエハWの搬入を待つ。そして例えば隣接する真空搬送室に設けられた不図示の搬送機構により処理対象のウエハWが搬送されてくると、ゲートバルブ37を開放する。搬送機構は、開放された搬入出口36を介して真空容器11内に進入し、回転テーブル2の凹部23内にウエハWを載置する。そして、各凹部23内にウエハWが載置されるように、回転テーブル2を間欠的に回転させながら、この動作を繰り返す。
またこのとき、吸着領域R1と酸化領域R2との間、プラズマ形成領域R3と吸着領域R1との間は、分離領域Dによって分離されているので、不必要な場所では原料ガスと酸化ガスとの接触に起因する堆積物は発生しにくい。
しかる後、真空容器11内の圧力をウエハWの搬出時の状態に調節し、ゲートバルブ37を開き、搬入時とは反対の手順でウエハWを取り出し、成膜処理を終える。
しかしながらこの場合には、高周波電力の増減に応じて、プラズマの大きさも変化してしまう場合があるので、高周波電力の増減の前後で、プラズマ処理の面内均一性などが変化してしまうおそれもある。
但し当該例は、枠体部43とスペーサー44a、44bとが一体化された環状部材により高さ調節部を構成し、当該環状部材を交換することにより、プラズマ窓421の配置高さ位置を変更する手法の採用を否定するものではない。
例えば収容容器42とシールド部材41とが一体に構成されている場合には、プラズマギャップが大きくなるように収容容器42を配置すると、金属製の天板12の内周面が露出して、プラズマ窓421と当該内周面との間に異常放電が形成されてしまうおそれがある。
なお本例では、ベローズ46やベローズ46の設置のしやすさの観点から、金属製の枠体部43と天板12との間にベローズ46を設けた例を示した。但し、石英製の枠体部43、シールド部材41にベローズ46や昇降機構45を設けることが可能な場合には、枠体部43の設置を省略して、収容容器42とシールド部材41との間をベローズ46で塞ぎ、収容容器42に設けた昇降機構45によって収容容器42を昇降させる構成を採用してもよい。
但し、プラズマ形成領域R3にて実施されるプラズマ処理の内容は上述の例に限定されるものではない。例えば図2に示す酸化領域R2への酸化ガスノズル53の配置を省略する一方、現在、プラズマ用ガスノズル54が配置されている位置にオゾンガス供給用の酸化ガスノズル53を配置し、オゾンガス(酸化ガス)をプラズマ化してウエハWに吸着したBTBASとの反応を進行させてもよい。
1、1a 成膜装置
11 真空容器
14 開口部
2 回転テーブル
21 回転軸
23 凹部
34、35 排気口
400 O−リング
41 シールド部材
411 突出部
42 収容容器
421 プラズマ窓
422 被支持部
43 枠体部
44、44a、44b
スペーサー
45 昇降機構
46 ベローズ
8 プラズマ形成部
92 ファラデーシールド
Claims (8)
- 金属製の真空容器内に設けられた回転テーブルの上面側の基板載置領域に基板を載置し、前記回転テーブルを回転させることにより、当該回転テーブルの回転中心の周りで基板を公転させながら前記基板に対して第1の処理ガス及び第2の処理ガスを順番に供給して成膜処理を行う成膜装置において、
分離領域を介して前記回転テーブルの周方向に互いに離間した第1の処理領域、第2の処理領域に、夫々第1の処理ガス、第2の処理ガスを供給するための第1の処理ガス供給部及び第2の処理ガス供給部と、
基板に対してプラズマ処理を行うために、前記真空容器内にプラズマ発生用ガスを供給するプラズマ発生用ガス供給部と、
前記プラズマ発生用ガスをプラズマ化するためのプラズマ形成部と、
前記真空容器の天井部側に設けられた開口部に挿入され、前記回転テーブルの上面と対向する底面部を備えると共に、前記底面部の上面側に前記プラズマ形成部を収容した収容容器と、
前記収容容器と前記真空容器の開口部の内周面との間に配置され、当該内周面の周方向に沿って環状に設けられた誘電体製のシールド部材と、
前記真空容器内に挿入された前記収容容器の底面部の配置高さ位置を調節するための高さ調節部と、
前記真空容器と前記開口部に挿入された収容容器との間を気密に塞ぐためのシール部と、を備えたことを特徴とする成膜装置。 - 前記シールド部材は、前記真空容器の天井部側から回転テーブル側へ向けて突出する突出部を備え、
前記突出部と回転テーブルとの間には、前記回転テーブルの上面と前記収容容器の底面部との間の距離よりも狭い隙間が形成されていることを特徴とする請求項1に記載の成膜装置。 - 前記収容容器は、前記開口部から真空容器の外部に突出した収容容器の周方向に沿って形成されたフランジ状の被支持部を備えることと、
前記高さ調節部は、前記開口部の周囲の真空容器の上面と、前記収容容器の被支持部との間に配置され、当該被支持部を介して収容容器を真空容器上に支持する環状部材により構成され、互いに高さが異なる複数の環状部材を交換することによって前記底面部の配置高さ位置の調節が行われることと、
前記シール部は、前記真空容器と高さ調節部との間、及び高さ調節部と被支持部との間に設けられることと、を特徴とする請求項1または2に記載の成膜装置。 - 前記環状部材は、前記被支持部を支持する上部側環状部材と、この上部側環状部材と真空容器の上面との間に配置される下部側環状部材と、に上下に分割されていることと、
前記複数の環状部材の交換は、前記下部側環状部材の配置を省略して前記上部側環状部材を真空容器の上面に直接配置することか、または、互いに高さが異なる複数の下部側環状部材を交換して配置することにより行われることと、
前記真空容器の上面と被支持部との間に下部側環状部材及び上部側環状部材が配置されている場合に、前記シール部は、これら下部側環状部材と上部側環状部材との間にも設けられることと、を特徴とする請求項3に記載の成膜装置。 - 前記高さ調節部は、前記収容容器を支持して上下方向に移動させる昇降機構を備えることと、
前記シール部は、前記真空容器と前記開口部に挿入された収容容器との間を気密に塞ぎ、当該収容容器の上下移動に伴って伸縮自在なベローズを備えることと、を特徴とする請求項1または2に記載の成膜装置。 - 前記プラズマ形成部は、前記プラズマ発生用ガスを誘導結合によりプラズマ化するために、前記回転テーブルの上面側に対向して設けられたアンテナと、前記アンテナの周囲に発生した電磁界における電界成分の通過を阻止すると共に磁界を前記プラズマ発生用ガス側へ通過させるために、各々アンテナと直交する方向に伸びるスリットがアンテナの延伸方向に沿って多数配列され、且つ、接地された導電性の板状体からなるファラデーシールドとを備えることと、
前記収容容器は誘電体により構成されていることと、を特徴とする請求項1ないし5のいずれか一つに記載の成膜装置。 - 前記プラズマ処理は成膜処理の一部を構成し、前記プラズマ発生用ガスは、前記第2の処理ガスであり、前記プラズマ発生用ガス供給部は、前記第2の処理ガス供給部であることを特徴とする請求項1ないし6のいずれか一つに記載の成膜装置。
- 前記プラズマ発生用ガス供給部は、前記回転テーブルの回転方向の下流側の領域に前記プラズマ発生用ガスを供給し、前記プラズマ処理は、前記第1の処理ガスと第2の処理ガスとの反応により基板上に形成された膜を改質する処理であることを特徴とする請求項1ないし6のいずれか一つに記載の成膜装置。
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