JP2012248788A - プラズマ処理装置及びそのガス供給方法 - Google Patents
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Abstract
【解決手段】ウエハのプラズマ処理中に少なくとも2種類以上の処理ガス(例えばC4F6ガスとC4F8ガス)を交互に切り換えて処理室内に供給する際に,切り換える処理ガスを供給する各ガス供給路については,そのガス供給路に設けられたマスフローコントローラ(MFC)の下流側の開閉バルブを開いたまま,マスフローコントローラに所定流量とゼロ流量を繰り返して設定することによって,各処理ガスの供給を交互にオンオフする。
【選択図】 図4
Description
先ず,本発明の実施形態にかかるプラズマ処理装置の構成例について説明する。ここでは処理室内に上部電極と下部電極(サセプタ)を対向配置して上部電極から処理ガスを処理室内に供給する平行平板型のプラズマ処理装置を例に挙げて説明する。図1は,本実施形態にかかるプラズマ処理装置100の概略構成を示す断面図である。
ここで,ガス供給系200の具体的構成例について説明する。ここでのガス供給系200は,処理室102内に4種の処理ガス(C4F8ガス,C4F6ガス,O2ガス,Arガス)を選択的に供給できるように構成した場合である。これらのガスのうち,C4F8ガス,C4F6ガスはともにエッチングガスとして交互に供給され,O2ガス,Arガスは必要に応じてこれらのガスとともに供給される。
処理室内圧力:40mTorr
ガス種及び流量比:C4F8/C4F6/Ar/O2=0/57/500/20sccm
第1高周波(40Hz):1200W
第2高周波(2Hz):5000W
エッチング時間:10秒
処理室内圧力:40mTorr
ガス種及び流量比:C4F8/C4F6/Ar/O2=57/0/500/40sccm
第1高周波(40Hz):1200W
第2高周波(2Hz):5000W
エッチング時間:10秒
次に,本実施形態の変形例として,このようにマスフローコントローラ230の下流側と上流側の両方の開閉バルブ220,240を開いたまま,処理ガスを交互に切り換えてプラズマエッチングを行うガス供給制御について,図面を参照しながら説明する。図8は本実施形態の変形例にかかるガス供給制御を示すタイミング図である。
102 処理室
110 下部電極
120 上部電極
122 シールドリング
124 ガス導入口
126 拡散室
128 ガス供給孔
130 電力供給装置
132 第1高周波電源
133 第1整合器
134 第2高周波電源
135 第2整合器
140 排気装置
142 排気口
150 制御部
152 操作部
154 記憶部
200 ガス供給系
210A〜210D ガス供給源
212A〜212D ガス供給路
214 共通ガス供給路
216 開閉バルブ
220A〜220D 上流側開閉バルブ
230A〜230D マスフローコントローラ(MFC)
231 本流路
232 側流路
233 上流側センサ
234 下流側センサ
235 流量調整弁(コントロールバルブ)
236 MFC制御回路
240A〜240D 下流側開閉バルブ
G ゲートバルブ
W ウエハ
Claims (7)
- 減圧可能な処理室内に所定のガスを供給しながらプラズマを生成することによって,前記処理室内の基板に所定のプラズマ処理を施すプラズマ処理装置のガス供給方法であって,
前記プラズマ処理装置は,
複数の処理ガス供給源にそれぞれガス供給路を接続し,これらガス供給路を介して前記処理室に所望の処理ガスを供給するガス供給系と,
前記各ガス供給路にそれぞれ設けられ,設定された流量に応じて流量調整弁の開度を調整することによって前記ガス供給路を流れるガスの流量を制御する流量制御器と,
前記各流量制御器の下流側にそれぞれ設けられた開閉バルブと,を備え,
前記基板のプラズマ処理中に少なくとも2種類以上の処理ガスを交互に切り換えて前記処理室内に供給する際に,前記切り換える処理ガスの各ガス供給路については,前記流量制御器の下流側の前記開閉バルブを開いたまま,前記流量制御器に所定流量とゼロ流量を繰り返して設定することによって,前記各処理ガスの供給を交互にオンオフすることを特徴とするプラズマ処理装置のガス供給方法。 - 前記各流量制御器の上流側にもそれぞれ開閉バルブを設け,
前記切り換える処理ガスの各ガス供給路については,前記流量制御器の下流側の前記開閉バルブのみならず上流側の前記開閉バルブも開いたまま,その流量制御器に対する所定流量とゼロ流量の設定制御を繰り返すことによって,前記各処理ガスの供給を交互にオンオフすることを特徴とする請求項1に記載のプラズマ処理装置のガス供給方法。 - 前記各処理ガスを交互に切り換えて前記処理室内に供給する際に,前記各処理ガスの切り換え時間が閾値以下か否かを判断し,
前記切り換え時間が閾値以下であると判断した場合,前記切り換える処理ガスの供給のオンオフは,前記開閉バルブを開いたまま,前記流量制御器に対する所定流量又はゼロ流量の設定によって行い,
前記切り換え時間が閾値以下でないと判断した場合,前記切り換える処理ガスの供給のオンオフは,前記開閉バルブの開閉によって行うことを特徴とする請求項1又は2に記載のプラズマ処理装置のガス供給方法。 - 前記切り換え時間の閾値は,1秒〜15秒の範囲で設定することを特徴とする請求項3に記載のプラズマ処理装置のガス供給方法。
- 前記切り換える処理ガスは,少なくとも2種類以上のエッチングガスであることを特徴とする請求項1〜4のいずれかに記載のプラズマ処理装置のガス供給方法。
- 前記切り換える処理ガスは,少なくともエッチングガスとクリーニングガスを含むことを特徴とする請求項1〜4のいずれかに記載のプラズマ処理装置のガス供給方法。
- 減圧可能な処理室内に所定のガスを供給しながらプラズマを生成することによって,前記処理室内の基板に所定のプラズマ処理を施すプラズマ処理装置であって,
複数の処理ガス供給源にそれぞれガス供給路を接続し,これらガス供給路を介して前記処理室に所望の処理ガスを供給するガス供給系と,
前記各ガス供給路にそれぞれ設けられ,設定された流量に応じて流量調整弁の開度を調整することによって前記ガス供給路を流れるガスの流量を制御する流量制御器と,
前記各流量制御器の下流側にそれぞれ設けられた開閉バルブと,
前記各流量制御器に流量を設定する制御部と,を備え,
前記制御部は,前記基板のプラズマ処理中に少なくとも2種類以上の処理ガスを交互に切り換えて前記処理室内に供給する際に,前記切り換える処理ガスの各ガス供給路については,前記流量制御器の下流側の前記開閉バルブを開いたまま,前記流量制御器に所定流量とゼロ流量を繰り返して設定することによって,前記各処理ガスの供給を交互にオンオフすることを特徴とするプラズマ処理装置。
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JP2011121475A JP5723678B2 (ja) | 2011-05-31 | 2011-05-31 | プラズマ処理装置及びそのガス供給方法 |
US13/483,843 US9236230B2 (en) | 2011-05-31 | 2012-05-30 | Plasma processing apparatus and gas supply method therefor |
CN201210174846.8A CN102810445B (zh) | 2011-05-31 | 2012-05-30 | 等离子体处理装置及其气体供给方法 |
TW101119237A TWI579885B (zh) | 2011-05-31 | 2012-05-30 | Plasma processing device and gas supply method thereof |
KR1020120057921A KR101934936B1 (ko) | 2011-05-31 | 2012-05-31 | 플라즈마 처리 장치 및 그 가스 공급 방법 |
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JP5723678B2 (ja) * | 2011-05-31 | 2015-05-27 | 東京エレクトロン株式会社 | プラズマ処理装置及びそのガス供給方法 |
JP5803552B2 (ja) * | 2011-10-14 | 2015-11-04 | 東京エレクトロン株式会社 | 処理装置 |
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US9236230B2 (en) | 2016-01-12 |
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