JP7004589B2 - 昇降機構、載置台及びプラズマ処理装置 - Google Patents
昇降機構、載置台及びプラズマ処理装置 Download PDFInfo
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- 238000012546 transfer Methods 0.000 claims description 144
- 238000003780 insertion Methods 0.000 claims description 81
- 230000037431 insertion Effects 0.000 claims description 81
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
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- 239000010703 silicon Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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Description
まず、本発明の一実施形態に係るプラズマ処理装置1の全体構成の一例について、図1を参照しながら説明する。図1は、一実施形態に係るプラズマ処理装置1の一例を示す図である。プラズマ処理装置1は、プラズマを用いて高アスペクト比のホールや溝を、被処理体としての半導体ウエハW(以下、ウエハWと称呼する)にエッチングすることが可能な半導体製造装置の一例である。
次に、従来の載置台112の一例について、図2を参照して説明した後、図3を参照して本実施形態に係る昇降機構を有する載置台12について詳述する。図2は、従来の載置台112の一例を示す図である。従来の載置台112では、伝熱ガス供給源105から出力された伝熱ガスは、伝熱ガス供給管101を介して載置台112に基台23内を水平方向に延びる伝熱ガス供給経路102に通される。そして、伝熱ガスは、伝熱ガス供給経路102に連通し、載置台112内を垂直方向に延びる伝熱ガス供給経路104を通って、伝熱ガス供給孔104aから静電チャック21の上面に導出される。
次に、本実施形態に係る載置台12及びウエハWの昇降機構について図3及び図4を参照しながら説明する。図3及び図4は、一実施形態に係るウエハWの昇降機構を含む載置台12の一例を示す図である。図3では、リフターピン103が下がった状態の載置台12の一例を示し、図4は、リフターピン103が上がった状態の載置台12の一例を示す。
本実施形態では、伝熱ガスが載置台12を貫通するピン挿通孔120から載置台12の上面に供給される。このため、リフターピン103のピン挿通孔120から伝熱ガスとともにパーティクルとなる潤滑剤がウエハW上のプラズマ側に導出され、処理容器10内が汚染されることが懸念される。
加えて、潤滑部108を伝熱ガス供給経路102よりも下側に配置する。より好ましくは、潤滑部108をリフターピン103の昇降量だけ伝熱ガス供給経路102から離して設置する。これにより、リフターピン103の先端部103aを静電チャック21の上面の位置T1からストローク分だけ上昇させ、最上位置T2に移動したときにも、リフターピン103の潤滑剤が塗布されている部分が伝熱ガス供給経路102に達しない。これにより、リフターピン103の表面に塗布された潤滑剤を伝熱ガスと接触させないようにすることができる。
最後に、図5を参照しながら本実施形態の変形例に係る載置台12について説明する。図5は、一実施形態に係る載置台12の変形例を示す図である。本実施形態の変形例に係る載置台12では、排気装置が接続される排気管140が部材109のピン挿通孔120の部分120bに連通し、ピン挿通孔120内の伝熱ガス及び伝熱ガス供給経路102内の伝熱ガスをピン挿通孔120の部分120bから排気する点が、本実施形態に係る載置台12の構成と異なる。本変形例に係る載置台12の他の構成については、本実施形態に係る載置台12と同一であるため、上記の異なる構成部分のみ説明する。
10 処理容器
12 載置台
21 静電チャック
23 基台
25 フォーカスリング
30 ガス供給源
32 第1高周波電源
34 第2高周波電源
40 ガスシャワーヘッド
100 伝熱ガス供給部
102 伝熱ガス供給経路
103 リフターピン
103a 先端部
105 伝熱ガス供給源
106、107 Oリング
108 潤滑部
108c 潤滑空間
109 部材
113 直流電源
120 ピン挿通孔
140 排気管
141 オリフィス
200 制御部
Claims (14)
- 処理容器内にて処理される被処理体を載置する載置台に上下方向に貫設されたピン挿通孔に挿通され、上下方向に昇降するリフターピンと、
前記リフターピンの所定の高さにて前記リフターピンと前記ピン挿通孔の内面との間に設けられ、前記リフターピンに潤滑剤を供給する潤滑部と、
前記リフターピンを上下方向に駆動する駆動部と、
前記潤滑部より上部にて前記ピン挿通孔に連通する伝熱ガス供給経路を有し、前記ピン挿通孔に伝熱ガスを供給する伝熱ガス供給部と、を有し、
前記伝熱ガス供給経路は、前記潤滑部から前記リフターピンの昇降量よりも離間した上部にて前記ピン挿通孔に連通する、
被処理体の昇降機構。 - 前記リフターピンの昇降量は、被処理体が前記載置台に載置されているときの最下位置から被処理体が前記リフターピンにより最も持ち上げられたときの最上位置までのリフターピンの移動量である、
請求項1に記載の被処理体の昇降機構。 - 処理容器内にて処理される被処理体を載置する載置台に上下方向に貫設されたピン挿通孔に挿通され、上下方向に昇降するリフターピンと、
前記リフターピンの所定の高さにて前記リフターピンと前記ピン挿通孔の内面との間に設けられ、前記リフターピンに潤滑剤を供給する潤滑部と、
前記リフターピンを上下方向に駆動する駆動部と、
前記潤滑部より上部にて前記ピン挿通孔に連通する伝熱ガス供給経路を有し、前記ピン挿通孔に伝熱ガスを供給する伝熱ガス供給部と、
前記ピン挿通孔に挿通され、伝熱ガスを排気する排気管と、を有し、
前記排気管は、前記伝熱ガス供給経路と前記ピン挿通孔とが連通した部分と前記潤滑部との間に配置されている、
被処理体の昇降機構。 - 前記伝熱ガス供給部は、前記伝熱ガス供給経路を経由して前記ピン挿通孔に前記伝熱ガスを通し、前記載置台の上面に供給する、
請求項1~3のいずれか一項に記載の被処理体の昇降機構。 - 前記伝熱ガス供給経路の前記ピン挿通孔に連通する部分には、溝が形成されている、
請求項1~4のいずれか一項に記載の被処理体の昇降機構。 - 処理容器内にて処理される被処理体を載置する載置台であって、
前記載置台に上下方向に貫設されたピン挿通孔に挿通され、上下方向に昇降するリフターピンと、
前記リフターピンの所定の高さにて前記リフターピンと前記ピン挿通孔の内面との間に設けられ、前記リフターピンに潤滑剤を供給する潤滑部と、
前記リフターピンを上下方向に駆動する駆動部と、
前記潤滑部より上部にて前記ピン挿通孔に連通する伝熱ガス供給経路を有し、前記ピン挿通孔に伝熱ガスを供給する伝熱ガス供給部と、を有する昇降機構を備え、
前記伝熱ガス供給経路は、前記潤滑部から前記リフターピンの昇降量よりも離間した上部にて前記ピン挿通孔に連通する、載置台。 - 前記リフターピンの昇降量は、被処理体が前記載置台に載置されているときの最下位置から被処理体が前記リフターピンにより最も持ち上げられたときの最上位置までのリフターピンの移動量である、
請求項6に記載の載置台。 - 処理容器内にて処理される被処理体を載置する載置台であって、
前記載置台に上下方向に貫設されたピン挿通孔に挿通され、上下方向に昇降するリフターピンと、
前記リフターピンの所定の高さにて前記リフターピンと前記ピン挿通孔の内面との間に設けられ、前記リフターピンに潤滑剤を供給する潤滑部と、
前記リフターピンを上下方向に駆動する駆動部と、
前記潤滑部より上部にて前記ピン挿通孔に連通する伝熱ガス供給経路を有し、前記ピン挿通孔に伝熱ガスを供給する伝熱ガス供給部と、
前記ピン挿通孔に挿通され、伝熱ガスを排気する排気管と、を有する昇降機構を備え、
前記排気管は、前記伝熱ガス供給経路と前記ピン挿通孔とが連通した部分と前記潤滑部との間に配置されている、載置台。 - 処理容器内にて処理される被処理体を載置する載置台であって、
前記載置台を構成する基台に上下方向に貫設されたピン挿通孔に挿通され、上下方向に昇降するリフターピンと、
前記リフターピンの所定の高さにて前記リフターピンと前記ピン挿通孔の内面との間に設けられ、前記リフターピンに潤滑剤を供給する潤滑部と、
前記リフターピンを上下方向に駆動する駆動部と、
前記ピン挿通孔に伝熱ガスを供給する伝熱ガス供給部と、を備え、
前記基台の内部であって前記潤滑部より上部において前記ピン挿通孔に連通し水平方向に伝熱ガスを供給する伝熱ガス供給経路が形成され、前記伝熱ガス供給部は前記ピン挿通孔よりも径方向外側において伝熱ガスを下方から前記伝熱ガス供給経路に供給することにより前記ピン挿通孔に伝熱ガスを供給する、載置台。 - 前記伝熱ガス供給経路は、前記基台とリング状部材とで形成される、
請求項9に記載の載置台。 - 前記リング状部材は、前記基台の内部であって被処理体の載置面よりも外周側に設けられ、前記伝熱ガス供給経路を前記処理容器内の処理空間から仕切り、前記処理空間に伝熱ガスが漏れないように構成される、
請求項10に記載の載置台。 - 前記伝熱ガス供給部は、前記伝熱ガス供給経路を経由して前記ピン挿通孔に前記伝熱ガスを通し、前記載置台の上面に供給する、
請求項6~11のいずれか一項に記載の載置台。 - 前記伝熱ガス供給経路の前記ピン挿通孔に連通する部分には、溝が形成されている、
請求項6~12のいずれか一項に記載の載置台。 - 処理容器と、
前記処理容器にガスを供給するガス供給部と、
前記処理容器内に設けられる、請求項6~13のいずれか一項に記載の載置台と、
前記処理容器内にプラズマを生成する高周波電力を供給する第1高周波電源と、
前記載置台にプラズマ中のイオンを引き込む高周波電力を供給する第2高周波電源と、
を有する、プラズマ処理装置。
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