JP2020188129A - 載置台および基板処理装置 - Google Patents
載置台および基板処理装置 Download PDFInfo
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Abstract
Description
第1実施形態に係る載置台は、図1に示されているように、第1実施形態に係る基板処理装置100に設けられている。図1は、第1実施形態に係る基板処理装置100の構成の一例を示す概略断面図である。基板処理装置100は、気密に構成され、電気的に接地電位とされた処理容器1を有している。処理容器1は、円筒状であり、例えばアルミニウム等から構成されている。処理容器1は、プラズマが生成される処理空間を画成する。処理容器1内には、被処理体(work-piece)の一例であるウエハWを支持する載置台本体2が設けられている。載置台本体2は、基台2a及び静電チャック(ESC:Electrostatic chuck)6を有する。基台2aは、導電性の金属、例えばアルミニウム等で構成されており、下部電極としての機能を有する。静電チャック6は、セラミックス、例えばアルミナ等で構成されており、ウエハWを静電吸着するための機能を有する。載置台本体2は、支持台4に支持されている。支持台4は、導体で形成されている。支持台4は、例えば石英等からなる支持部材3に支持されている。載置台本体2の上方の外周には、例えばシリコンで形成されたエッジリング5が設けられている。処理容器1内には、載置台本体2及び支持台4の周囲を囲むように、例えば石英等からなる円筒状の内壁部材3aが設けられている。
次に、図2を参照して、載置台本体2の構成の一例について説明する。図2は、第1実施形態に係る基板処理装置100の載置台本体2の一例を示す概略断面図である。載置台本体2には、載置面21が形成されている。載置面21は、静電チャック6の上面から形成され、ドット状に形成されている。複数のピン用貫通孔200のうちの1つのピン用貫通孔22は、載置面21に沿う平面に垂直である回転軸23を囲むように、回転軸23に沿って形成されている。尚、図2において載置面21はドット状に形成されているが、平坦に形成されていてもよい。
制御部90は、ウエハWが載置台本体2に載置されていない場合で、複数のリフターピン61が受渡位置に配置されていないときに、昇降機構62を制御することにより、複数のリフターピン61を受渡位置に配置する。すなわち、制御部90は、複数のリフターピン61が収容位置に配置されているときに、昇降機構62を制御することにより、複数のリフターピン61を所定の回転速度で順回転させる。おねじ68は、複数のリフターピン61が所定の順回転速度で順回転することにより、めねじ26を滑り、複数のリフターピン61を所定の低速度で上昇させる。おねじ68は、複数のリフターピン61が収容位置から所定の高さ以上に上昇することにより、めねじ26から外れる。制御部90は、おねじ68がめねじ26から外れた後に、複数のリフターピン61を回転させることなく、高速度で複数のリフターピン61を上昇させ、複数のリフターピン61を受渡位置に配置する。
pd1=50×3=150
比較例の基板処理装置における最小放電電圧Vは、パッシェンカーブ41において値pd1に対応する値V1に等しく、約2000Vを示している。
pd2=50×9=450
第1実施形態に係る基板処理装置100における最小放電電圧Vは、パッシェンカーブ41において値pd2に対応する値V2に等しく、約5000Vを示している。パッシェンカーブ41は、さらに、値V2が値V1より大きいことを示している。
ところで、第1実施形態に係る載置台のリフターピン63は、基端部分65と先端部分67とにおねじ68が形成されていないが、基端部分65と先端部分67とにおねじが形成されていてもよい。第2実施形態に係る載置台は、図6に示されているように、既述の第1実施形態に係る載置台のリフターピン63が他のリフターピン401に置換され、他の部分は、既述の第1実施形態に係る載置台と同じである。図6は、第2実施形態に係る載置台の一例を示す概略断面図である。
1 :処理容器
2 :載置台本体
2a :基台
6 :静電チャック
10a :第1のRF電源
10b :第2のRF電源
12 :直流電源
21 :載置面
22 :ピン用貫通孔
26 :めねじ
27 :内壁
62 :昇降機構
63 :リフターピン
68 :おねじ
69 :上端
401 :リフターピン
402 :上端
403 :おねじ
Claims (6)
- プラズマを用いて処理される被処理体が載置される載置台本体と、
前記載置台本体に形成されるピン用貫通孔に挿入されるリフターピンと、
前記リフターピンを前記載置台本体に対して昇降させることにより前記被処理体を昇降させる昇降機構とを備え、
前記リフターピンのうちの前記ピン用貫通孔の内壁に対向する部分には、おねじが形成され、
前記内壁には、前記おねじに嵌合するめねじが形成される
載置台。 - 前記リフターピンは、前記被処理体が前記リフターピンにより前記載置台本体から持ち上げられているときに、前記おねじが前記めねじから外れるように、形成される
請求項1に記載の載置台。 - 前記昇降機構は、
前記おねじが前記めねじに嵌合しているときに、前記リフターピンを回転させることにより前記リフターピンを第1の速さで昇降させ、
前記おねじが前記めねじから外れているときに、前記第1の速さと異なる第2の速さで前記リフターピンを昇降させる
請求項2に記載の載置台。 - 前記リフターピンのうちの前記被処理体に接触する部分は、前記被処理体を形成する第1の材料より摩耗しにくい第2の材料により被覆される
請求項1から請求項3のいずれか一項に記載の載置台。 - 前記載置台本体は、
前記ピン用貫通孔が形成される基台と、
クーロン力により前記被処理体を前記基台に固定する静電チャックとを有する
請求項1から請求項4のいずれか一項に記載の載置台。 - 被処理体が載置される載置台本体と、
プラズマを用いて前記被処理体を処理する処理部と、
前記載置台本体に形成されるピン用貫通孔に挿入されるリフターピンと、
前記リフターピンを前記載置台本体に対して昇降させることにより、前記被処理体を昇降させる昇降機構とを備え、
前記リフターピンのうちの前記ピン用貫通孔の内壁に対向する部分には、おねじが形成され、
前記内壁には、前記おねじに嵌合するめねじが形成される
基板処理装置。
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