JP2016189295A - プラズマ処理装置、プラズマ処理方法及び記憶媒体 - Google Patents
プラズマ処理装置、プラズマ処理方法及び記憶媒体 Download PDFInfo
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Abstract
Description
前記回転テーブルの下方側に設けられ、基板を加熱するヒータと、
前記回転テーブルの上面側に処理ガスを供給する処理ガス供給部と、
前記処理ガスをプラズマ化して誘導結合プラズマを発生させるためのアンテナと、
前記プラズマの発生領域における光のカラー成分であるR成分、G成分及びB成分の各光強度を検出する光検出部と、
前記光検出部にて検出されたR成分、G成分及びB成分の各光強度のうち少なくとも一つの光強度について、前記アンテナに対する高周波電力の供給の前後における変化量に対応する評価値を求める算出部と、
前記算出部により求めた評価値と閾値とを比較し、評価値が閾値を越えていないときにはプラズマの着火が起こっていないと判断する着火判断部と、を備え、
前記回転テーブルは、前記ヒータが発する光を透過する材質により構成されていることを特徴とする。
前記回転テーブルの下方側に設けられたヒータにより基板を加熱する工程と、
前記回転テーブルの一面側に処理ガスを供給する工程と、
前記処理ガスをプラズマ化して誘導結合プラズマを発生させるために、アンテナに高周波電力を供給するための信号を出力する工程と、
前記プラズマの発生領域における光のカラー成分であるR成分、G成分及びB成分の各光強度を検出する工程と、
前記アンテナに高周波電力を供給する工程の前後において、検出されたR成分、G成分及びB成分の各光強度のうち少なくとも一つの光強度の変化量に対応する評価値を求める工程と、
求めた評価値と閾値とを比較し、評価値が閾値を越えていないときにはプラズマの着火が起こっていないと判断する工程と、を備え、
前記回転テーブルは、前記ヒータが発する光を透過する材質により構成されていることを特徴とする。
評価値=(Rの比率の変化率)2+(Gの比率の変化率)2+(Bの比率の変化率)2 … 式(1)
Rの比率の変化率=(t0前のRの比率−t0後のRの比率)2÷t0前のRの比率
Gの比率の変化率=(t0前のGの比率−t0後のGの比率)2÷t0前のGの比率
Bの比率の変化率=(t0前のBの比率−t0後のBの比率)2÷t0前のBの比率
図6(b)は、式(1)で決めた評価値について、時刻t1以降にプラズマの着火が行われた場合における時刻t0前後の推移を示している。そして評価値を用いてプラズマが着火しているか否かを判断するために、判断基準となる閾値を予め設定する。この閾値としては、例えばプラズマの発生を事前に複数回行い、各回におけるプラズマの着火時に得られるR、G、Bの比率の変化率に基づいて評価して決定することができる。プラズマ検出プログラム215は、式(1)の演算を行って評価値を求め、評価値と閾値とを比較して、評価値が閾値を越えていればプラズマの着火が行われたと判断し、評価値が閾値を越えていなければプラズマの着火が行われていないと判断するステップ群を備えている。
従ってプラズマ検出プログラム215は、評価値を算出する算出部及びプラズマの着火の有無を判断する着火判断部に相当する。
なお、図10は、回転テーブル2を400℃に加熱した状態で、透過窓300側から真空容器1内を撮像した写真であり、図10(a)はプラズマが発生していない状態、図10(b)はプラズマが発生している状態を示している。
1 真空容器
2 回転テーブル
P1、P2、P3 処理領域
31、32、34 ガスノズル
7 ヒータユニット
80 プラズマ処理部
83 アンテナ
83a スイッチ部
200 検出部
301 光検出部
Claims (7)
- 真空容器内に設けられた回転テーブルの上面側に基板を載置し、前記回転テーブルを回転させることにより基板を公転させながら当該基板に対してプラズマ処理するプラズマ処理装置において、
前記回転テーブルの下方側に設けられ、基板を加熱するヒータと、
前記回転テーブルの上面側に処理ガスを供給する処理ガス供給部と、
前記処理ガスをプラズマ化して誘導結合プラズマを発生させるためのアンテナと、
前記プラズマの発生領域における光のカラー成分であるR成分、G成分及びB成分の各光強度を検出する光検出部と、
前記光検出部にて検出されたR成分、G成分及びB成分の各光強度のうち少なくとも一つの光強度について、前記アンテナに対する高周波電力の供給の前後における変化量に対応する評価値を求める算出部と、
前記算出部により求めた評価値と閾値とを比較し、評価値が閾値を越えていないときにはプラズマの着火が起こっていない判断する着火判断部と、を備え、
前記回転テーブルは、前記ヒータが発する光を透過する材質により構成されていることを特徴とするプラズマ処理装置。 - 前記評価値は、R成分、G成分及びB成分の各光強度のうち少なくとも一つの光強度の比率の変化量に対応する値であることを特徴とする請求項1記載のプラズマ処理装置。
- 前記光強度の比率の変化量に対応する値は、光強度の比率の変化率に対応する値であることを特徴とする請求項2記載のプラズマ処理装置。
- 前記アンテナとプラズマ発生領域との間にはファラデーシールドが介在して設けられ、前記光検出部は、ファラデーシールドの開口部を通じてプラズマ発生領域の光を検出するように設けられていることを特徴とする請求項1ないし3のいずれか一つ記載のプラズマ処理装置。
- 前記着火判断部によりプラズマの着火が起こっていないと判断された時、前記アンテナへの給電を一旦中止して、その後当該給電を再開するように制御信号を出力する制御部を備えた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プラズマ処理装置。
- 真空容器内に設けられた回転テーブルの上面側に基板を載置し、前記回転テーブルを回転させることにより基板を公転させる工程と、
前記回転テーブルの下方側に設けられたヒータにより基板を加熱する工程と、
前記回転テーブルの一面側に処理ガスを供給する工程と、
前記処理ガスをプラズマ化して誘導結合プラズマを発生させるために、アンテナに高周波電力を供給する工程と、
前記プラズマの発生領域における光のカラー成分であるR成分、G成分及びB成分の各光強度を検出する工程と、
検出されたR成分、G成分及びB成分の各光強度のうち少なくとも一つの光強度について、前記アンテナに高周波電力を供給する工程の前後における変化量に対応する評価値を求める工程と、
求めた評価値と閾値とを比較し、評価値が閾値を越えていないときにはプラズマの着火が起こっていないと判断する工程と、を備え、
前記回転テーブルは、前記ヒータが発する光を透過する材質により構成されていることを特徴とするプラズマ処理方法。 - 真空容器内に設けられた回転テーブルの上面側に基板を載置し、前記回転テーブルを回転させることにより基板を公転させながら当該基板に対してプラズマ処理するプラズマ処理装置に用いられるコンピュータプログラムを記憶した記憶媒体であって、
前記コンピュータプログラムは、請求項6に記載のプラズマ処理方法を実行するようにステップ群が組まれていることを特徴とする記憶媒体。
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