JP7138514B2 - 環状部材、プラズマ処理装置及びプラズマエッチング方法 - Google Patents
環状部材、プラズマ処理装置及びプラズマエッチング方法 Download PDFInfo
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- JP7138514B2 JP7138514B2 JP2018155796A JP2018155796A JP7138514B2 JP 7138514 B2 JP7138514 B2 JP 7138514B2 JP 2018155796 A JP2018155796 A JP 2018155796A JP 2018155796 A JP2018155796 A JP 2018155796A JP 7138514 B2 JP7138514 B2 JP 7138514B2
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- Plasma Technology (AREA)
Description
まず、一実施形態に係るプラズマ処理装置10の一例について、図1を参照しながら説明する。プラズマ処理装置10は、略円筒形状の処理容器12を有する。処理容器12は、例えばアルミニウムから形成されており、当該処理容器12の内壁面には陽極酸化処理が施されている。この処理容器12は接地されている。
かかる構成のプラズマ処理装置10内にてウエハWが載置される載置台PDの周囲に、ウエハWを囲むように設けられ、石英にシリコンが所定の割合(含有率)で含有されたエッジリング15について、図2を参照して説明する。
図3は、一実施形態にかかるエッジリング15を配置した効果の一例を示す。図3(a)の横軸は、300mmウエハの中心を0mmとして直径方向の位置を示し、縦軸は、各位置におけるスパッタレート(nm/min)を示す。
<一実施形態:プロセス条件>
・第1ステップ
圧力 20mT(2.67Pa)
HF 350(W)
LF 1500(W)
ガス種 CF4、O2、Ar
・第2ステップ
圧力 80mT(10.67Pa)
HF 300(W)
LF 4500(W)
ガス種 HBr、O2、NF3
・第3ステップ
圧力 80mT
HF 300(W)
LF 4500(W)
ガス種 HBr、O2、NF3
・第4ステップ
圧力 80mT
HF 300(W)
LF 4500(W)
ガス種 HBr、O2、NF3
<比較例:プロセス条件>
・第1ステップ
圧力 20mT(2.67Pa)
HF 350(W)
LF 1500(W)
ガス種 CF4、O2、Ar
・第2ステップ
圧力 80mT(10.67Pa)
HF 300(W)
LF 4500(W)
ガス種 HBr、O2、NF3
・第3ステップ
圧力 80mT
HF 300(W)
LF 4500(W)
ガス種 HBr、O2、NF3
・第4ステップ
圧力 80mT
HF 300(W)
LF 4500(W)
ガス種 HBr、O2、NF3
図3(a)の結果を検証すると、一実施形態の結果(X軸方向及びX軸に垂直なY軸方向のスパッタレート)と、比較例の結果(X軸方向及びY軸方向のスパッタレート)の間でスパッタレートはほぼ変わらなかった。よって、HF及びLFの高周波電力の効率及びウエハW及びエッジリング15へのイオンの衝突の物理的状態は変わっていないことを示す。言い換えれば、図3(b)に示すウエハWのマスクリメインは、化学的変動要素が大きいと言える。
最後に、一実施形態の変形例に係るエッジリング15又はカバーリング13の一例について、図5を参照して説明する。図5は、一実施形態の変形例に係るエッジリング15又はカバーリング13の一例を示す図である。
2 …マスク
10…プラズマ処理装置
12…処理容器
13…カバーリング
15…エッジリング
30…上部電極
34…天板
40…ガスソース群
50…排気装置
62…第1の高周波電源
64…第2の高周波電源
70…電源
80…制御部
PD…載置台
LE…下部電極
ESC…静電チャック
EL…被エッチング層
MK…マスク
DP…堆積物
Claims (6)
- プラズマ処理装置内にて被処理体が載置される載置台の周囲に、前記被処理体を囲むように設けられる環状部材であって、
所定の含有率で添加されたシリコンを含有し、シリコンと一体的に形成された石英を有し、石英及びシリコンに対するシリコンの含有率が重量比で2.5%以上10%以下であり、
前記添加されたシリコンは、前記環状部材の厚さ方向における全体に対して、内径から外径までであって、前記環状部材の上面から前記環状部材の上面を基準とした深さ方向の20~50%の位置までの領域に局所的に含有されている、環状部材。 - 前記環状部材は、エッジリング又はカバーリングの少なくともいずれかである、
請求項1に記載の環状部材。 - 前記被処理体に形成された被エッチング対象膜は、シリコン、タングステンシリコン又はタングステンナイトライドシリコンである、
請求項1又は2に記載の環状部材。 - 前記被処理体に形成された被エッチング対象膜の上のマスクは、酸化シリコン、タングステンシリコン又はタングステンナイトライドシリコンである、
請求項1~3のいずれか一項に記載の環状部材。 - 被処理体をプラズマ処理するための処理容器と、
前記処理容器内に設けられ、前記被処理体が載置される載置台と、
前記処理容器内にて前記載置台の周囲に前記被処理体を囲むように設けられる環状部材と、を有し、
前記環状部材は、
所定の含有率で添加されたシリコンを含有し、シリコンと一体的に形成された石英を有し、石英及びシリコンに対するシリコンの含有率が重量比で2.5%以上10%以下であり、
前記添加されたシリコンは、前記環状部材の厚さ方向における全体に対して、内径から外径までであって、前記環状部材の上面から前記環状部材の上面を基準とした深さ方向の20~50%の位置までの領域に局所的に含有されている、プラズマ処理装置。 - 被処理体に形成されたマスクを用いて、被処理体をプラズマエッチングする方法であって、
処理容器内にて前記被処理体が載置される載置台と、
前記処理容器内にて前記載置台の周囲に前記被処理体を囲むように設けられる環状部材と、を有するプラズマ処理装置において実行される方法であり、
前記環状部材は、
所定の含有率で添加されたシリコンを含有し、シリコンと一体的に形成された石英と、
石英及びシリコンに対するシリコンの含有率が重量比で2.5%以上10%以下であり、
前記添加されたシリコンは、前記環状部材の厚さ方向における全体に対して、内径から外径までであって、前記環状部材の上面から前記環状部材の上面を基準とした深さ方向の20~50%の位置までの領域に局所的に含有され、
前記環状部材から前記マスクにシリコンを供給する工程を有する、
プラズマエッチング方法。
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