JP5661523B2 - 成膜方法及び成膜装置 - Google Patents
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- C23C16/45523—Pulsed gas flow or change of composition over time
- C23C16/45525—Atomic layer deposition [ALD]
- C23C16/45544—Atomic layer deposition [ALD] characterized by the apparatus
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- H01L21/3105—After-treatment
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Description
図1は、本発明の第1の実施形態によるALD装置を模式的に示す縦断面図であり、図2は、図1のALD装置の横断面図である。
図1に示すように、成膜装置80は、下端が開口された有天井の円筒体状を有する、たとえば石英により形成される処理容器1を有している。処理容器1内の上方には、石英製の天井板2が設けられている。また、処理容器1の下端開口部には、例えばステンレススチールにより円筒体状に成形されたマニホールド3がOリング等のシール部材4を介して連結されている。
次に、図3及び図4Aを参照しながら、本発明の第2の実施形態による成膜方法を、上述の成膜装置80を用いて実施する場合を例にとり説明する。図3は、本実施形態の成膜方法を示すタイムチャートであり、図4Aは、本実施形態の成膜方法により酸化シリコン膜が成膜されるウエハWの断面図を主要ステップごとに模式的に示す断面図である。図4A(a)を参照すると、ウエハWには、例えば約30nmの幅を有する複数のラインLが形成され、隣り合う2つのラインLの間には、例えば約30nmの幅を有するスペースSが形成されている。このようなライン・スペース・パターンは、例えばダブルパターニング(DP)技術により形成することができる。なお、ラインLは、図示の例では、シリコンにより形成されているが、これに限らず、金属で形成されていても良い。
次に、図5Aを参照しながら、本発明の第3の実施形態による成膜方法を説明する。本実施形態による成膜方法おいても上述の成膜装置80が用いられる。また、本実施形態による成膜方法においては、第3の実施形態による成膜方法と同様に、図3に示す成膜ステップS1、条件変更ステップS2、CORステップS3、及び条件変更ステップS4がこの順に繰り返される。また、成膜ステップS1においてSi含有ガスとしてのビスターシャリブチルアミノシラン(BTBAS)ガスと、酸素含有ガスとしての酸素(O2)ガスとが用いられ、いわゆる原子層堆積(ALD)法により酸化シリコンが成膜される。以下、相違点を中心に説明する。
例えば、DCSガスとN2Oガスを用いたHTOと、BTBASガスとO2プラズマとを用いてALD−oxideとを例示したが、成膜ステップS1において利用できる成膜法は、これらに限られない。例えば、モノシランガスとN2Oガスとを用いた成膜法を利用しても良く、テトラエトキシシラン(TEOS)とオゾン(O3)を用いた酸化シリコン膜の成膜法を利用しても良い。この場合、例えば成膜装置18の酸素含有ガス配管17Lにオゾナイザを設けることにより、O3ガスを供給することができる。
Claims (6)
- 凹部を含むパターンが形成された複数の基板を多段にして反応管に搭載するステップと、
シリコン含有ガス及び酸素含有ガスを前記反応管へ供給することにより、前記複数の基板上に酸化シリコン膜を成膜する成膜ステップと、
フッ酸ガス及びアンモニアガスを前記反応管へ供給することにより、前記成膜ステップにおいて成膜された前記酸化シリコン膜をエッチングするエッチングステップと、
前記成膜ステップから前記エッチングステップへ切り替える際に、前記基板の温度を変更し、安定化させる条件変更ステップと
を含み、
前記エッチングステップは、前記酸化シリコン膜の表層部を変性させることで変性層を形成する工程を含み、
前記成膜ステップにおける前記基板の温度は、前記変性層の昇華温度よりも高く、前記エッチングステップにおける前記基板の温度は、前記変性層の昇華温度よりも低く、
前記成膜ステップと前記エッチングステップとが同一の前記反応管内において交互に繰り返される成膜方法。 - 前記エッチングステップにおいて、前記成膜ステップにおいて前記凹部の側壁の上端部に成膜された前記酸化シリコン膜に対するエッチング速度が、前記凹部の底部に成膜された前記酸化シリコン膜に対するエッチング速度よりも速くなるようにエッチングされる、請求項1に記載の成膜方法。
- 前記成膜ステップから前記エッチングステップへ切り替える際に、エッチングステップに適したエッチング条件を設定するための条件変更ステップを更に含む、請求項1又は2に記載の成膜方法。
- 前記エッチングステップから前記成膜ステップへ切り替える際に、成膜ステップに適した成膜条件を設定するための他の条件変更ステップを更に含む、請求項1から3のいずれか一項に記載の成膜方法。
- 凹部を含むパターンが形成される複数の基板を多段に支持するウエハ支持部と、
前記基板を加熱する加熱部と、
下部に開口部を有する有蓋形状を有し、前記ウエハ支持部が前記開口部から挿入可能な反応管と、
前記反応管内において前記ウエハ支持部により支持される前記複数の基板に対し、
シリコン含有ガスを供給するシリコン含有ガス供給部、
酸素含有ガスを供給する酸素ガス供給部、
フッ酸ガスを供給するフッ酸ガス供給部、及び
アンモニアガスを供給するアンモニアガス供給部と、
前記複数の基板に対してシリコン含有ガス及び酸素含有ガスを供給することにより、前記複数の基板上に酸化シリコン膜を成膜し、前記酸化シリコン膜が成膜された前記複数の基板に対してフッ酸ガス及びアンモニアガスを供給することにより、前記酸化シリコン膜の表層部を変性させることで変性層を形成し、前記酸化シリコン膜をエッチングするように、前記シリコン含有ガス供給部、前記酸素ガス供給部、前記フッ酸ガス供給部、及びアンモニアガス供給部を制御し、
前記酸化シリコン膜の成膜のときの前記基板の温度は、前記変性層の昇華温度よりも高く、前記酸化シリコン膜のエッチングのときの前記基板の温度は、前記変性層の昇華温度よりも低く、前記酸化シリコン膜の成膜から前記酸化シリコン膜のエッチングへ切り替える際に、前記基板の温度を変更し、安定化させるように、前記加熱部を制御する制御部と
を備える成膜装置。 - 前記凹部の側壁の上端部に成膜された前記酸化シリコン膜に対するエッチング速度が、前記凹部の底部に成膜された前記酸化シリコン膜に対するエッチング速度よりも速くなるようにエッチングされる、請求項5に記載の成膜装置。
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JP2011061216A JP5661523B2 (ja) | 2011-03-18 | 2011-03-18 | 成膜方法及び成膜装置 |
TW101108695A TWI547586B (zh) | 2011-03-18 | 2012-03-14 | 膜沉積方法與膜沉積設備 |
US13/420,723 US9005459B2 (en) | 2011-03-18 | 2012-03-15 | Film deposition method and film deposition apparatus |
KR1020120027233A KR101514867B1 (ko) | 2011-03-18 | 2012-03-16 | 성막 방법 및 성막 장치 |
CN201210073108.4A CN102691048B (zh) | 2011-03-18 | 2012-03-19 | 成膜方法及成膜装置 |
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JP5661523B2 true JP5661523B2 (ja) | 2015-01-28 |
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