JP2020033625A - 成膜装置及び成膜方法 - Google Patents
成膜装置及び成膜方法 Download PDFInfo
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Abstract
Description
前記真空容器内にて基板を載置すると共に加熱する載置部と、
前記載置部に対向する対向部と、当該対向部に開口した複数のガス吐出口と、を備え、前記ガス吐出孔から加熱された前記基板に成膜ガスを供給して当該基板に成膜するシャワーヘッドと、
複数の前記基板へ前記成膜ガスを各々供給する合間で、当該基板が前記真空容器に格納されていないときに、当該真空容器内をクリーニングするクリーニングガスを供給するクリーニングガス供給部と、
前記各基板に前記成膜ガスを供給するときの前記シャワーヘッドにおける熱の反射率の変動を緩和するために、少なくとも前記対向部にて前記シャワーヘッドを構成する基材を被覆して当該シャワーヘッドの表面を形成する無孔質の被覆膜と、
を備える。
なお、実際にはクリーニングの終了後、ウエハWへの成膜前及び初めて成膜処理を行う前には、処理容器11内にウエハWが格納されていない状態でウエハWの成膜処理時と同様に各ガスが供給され、TiN膜の形成(プリコート)が行われる。ウエハWへの成膜処理と同様の処理のため、当該プリコートの図示は省略している。
続いて、既述した本開示の成膜装置に関連して行われた試験について、以下に説明する。
評価試験1
評価試験1−1においては、実施形態で説明したJIS規格のA5052の基材53と、被覆膜54とを備えたシャワーヘッド5について、当該シャワーヘッド5に照射される赤外線の波長と、当該赤外線の反射率との関係を示すスペクトルを取得した。評価試験1−2においては、JIS規格のA5052の基材53が剥き出しのシャワーヘッド、即ち既述の比較例のシャワーヘッドをクリーニングガス(ClF3ガス)に曝した。そして、評価試験1−1と同様に、照射される赤外線の波長と当該赤外線の反射率との関係を示すスペクトルを取得した。
評価試験2−1としてシャワーヘッド5を備えた成膜装置1を用いて、1000枚のウエハWに対して、成膜される膜厚が各々同じとなるように同じ処理条件を設定して成膜処理を行った。ウエハWを複数処理する合間には、適宜クリーニングを行った。成膜処理された各ウエハWについては面内の複数箇所の膜厚を計測し、膜厚の平均値及び膜厚のレンジ(最大値と最小値との差)を算出した。評価試験2−2として、評価試験2−1と略同様の試験を行った。ただしこの評価試験2−2では、シャワーヘッド5の代わりに比較例のシャワーヘッドを備えた成膜装置1を用いてウエハWに処理を行った。評価試験2−1、2−2共に使用したシャワーヘッドは新品であり、従って試験開始時にはクリーニングガスに曝されていない。
10 制御部
11 真空容器
21 載置台
64G、64H、33 クリーニングガス供給源
5 シャワーヘッド
52 ガス吐出口
53 基材
54 被覆膜
57 対向部
Claims (8)
- 内部に真空雰囲気を形成する真空容器と、
前記真空容器内にて基板を載置すると共に加熱する載置部と、
前記載置部に対向する対向部と、当該対向部に開口した複数のガス吐出口と、を備え、前記複数のガス吐出口から加熱された前記基板に成膜ガスを供給して当該基板に成膜するシャワーヘッドと、
複数の前記基板へ前記成膜ガスを各々供給する合間で、当該基板が前記真空容器に格納されていないときに、当該真空容器内をクリーニングするクリーニングガスを供給するクリーニングガス供給部と、
前記各基板に前記成膜ガスを供給するときの前記シャワーヘッドにおける熱の反射率の変動を緩和するために、少なくとも前記対向部にて前記シャワーヘッドを構成する基材を被覆して当該シャワーヘッドの表面を形成する無孔質の被覆膜と、
を備える成膜装置。 - 前記基材はアルミニウムを含む金属により構成され、前記被覆膜はアルマイト膜である請求項1記載の成膜装置。
- 前記基材は、JIS規格のA5052である請求項2記載の成膜装置。
- 前記成膜ガスが供給されるときに、前記基板は400℃以上に加熱される請求項1ないし3のいずれか一つに記載の成膜装置。
- 前記クリーニングガスは三フッ化塩素ガスである請求項1ないし4のいずれか一つに記載の成膜装置。
- 波長が3μm〜7μmの赤外線の前記被覆膜における反射率が、80%〜92%である請求項1ないし5のいずれか一つに記載の成膜装置。
- 3μm〜7μmの範囲内における任意の波長の赤外線に対する前記被覆膜の反射率を第1の反射率とし、
前記任意の波長の赤外線に対する前記クリーニングガスに曝された前記基材の反射率を第2の反射率とすると、
第1の反射率/第2の反射率=0.8〜1.2である請求項1ないし6のいずれか一つに記載の成膜装置。 - 真空容器の内部に真空雰囲気を形成する工程と、
前記真空容器内の載置部に基板を載置して加熱する工程と、
前記載置部に対向する対向部と、当該対向部に開口した複数のガス吐出口とを備えるシャワーヘッドの前記複数のガス吐出口から加熱された前記基板に成膜ガスを供給して前記基板に成膜する工程と、
前記複数の基板へ成膜ガスを各々供給する合間で、当該基板が前記真空容器に格納されていないときに、クリーニングガス供給部からクリーニングガスを供給して当該真空容器内をクリーニングする工程と、
を備え、
前記各基板に前記成膜ガスを供給するときの前記シャワーヘッドにおける熱の反射率の変動を緩和するために、少なくとも前記対向部にて前記シャワーヘッドを構成する基材を被覆して当該シャワーヘッドの表面を形成する無孔質の被覆膜が設けられる成膜方法。
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