JP7008602B2 - 成膜装置および温度制御方法 - Google Patents
成膜装置および温度制御方法 Download PDFInfo
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Description
[成膜装置1の構成]
図1は、本開示の第1の実施形態における成膜装置1の一例を示す図である。本実施形態における成膜装置1は、蒸着重合により、被処理基板の一例であるウエハW上に重合体の膜を成膜する。成膜装置1は、装置本体10および制御装置100を備える。装置本体10は、略円筒形状の処理空間Sを有する処理容器11を備える。処理容器11内には、ウエハWが収容される。処理容器11によって形成される略円筒状の処理空間Sの中心軸を軸Xと定義する。
ここで、2種類の原料モノマーの混合ガスは、所定温度以下で重合反応を起こし、重合体を形成する。重合体は、温度が低いほど多く生成される。そのため、ウエハWの温度が低いほど、ウエハWに積層される重合体の膜のデポジションレート(D/R)は大きくなる。
図3は、ウエハWの温度分布の一例を示す図である。ステージヒータ14aの温度が例えば80℃に設定された場合、ステージヒータ14aによるステージ14の上面の温度分布は、例えば図3の点線で示される温度分布となる。
図4は、天板ヒータ13aの温度とウエハWの温度との関係の一例を示す図である。図4に示された実験では、ステージヒータ14aおよびチラーユニット40によるステージ温度が80℃に設定され、側壁ヒータ13bの温度が120℃に設定され、天板11aとステージ14との間のギャップが20mmに設定されている。
シリコン膜、誘電体膜、または金属膜等をCVD(Chemical Vapor Deposition)やALD(Atomic Layer Deposition)等により成膜する場合、成膜は表面吸着反応に律速されるため、ウエハWが載置されるステージ14の温度が支配的となる。しかし、本実施形態のように、2種類のモノマーを用いた重合反応では、ステージ14の温度だけでなく、処理空間Sの温度も反応に影響を与える。
図6は、第1の実施形態における温度制御方法の一例を示すフローチャートである。図6に例示された温度制御方法は、制御装置100が装置本体10の各部を制御することによって実現される。
第1の実施形態の成膜装置1では、温度測定用ウエハW’を用いて成膜処理時の各ヒータの温度設定等が決定される。これに対し、本実施形態の成膜装置1では、ウエハWの成膜処理中に、ウエハWの温度を測定し、ウエハWの温度が所定の温度となるように、各ヒータの温度等が制御される。
図9は、第2の実施形態における温度制御方法の一例を示すフローチャートである。図9に例示された温度制御方法は、制御装置100が装置本体10の各部を制御することによって実現される。
なお、本願に開示された技術は、上記した実施形態に限定されるものではなく、その要旨の範囲内で数々の変形が可能である。
W ウエハ
W’ 温度測定用ウエハ
X 軸
1 成膜装置
10 装置本体
100 制御装置
101 ユーザI/F
11 処理容器
110 領域
111 領域
11a 天板
11b 側壁
11c 底部
12 断熱部材
13a 天板ヒータ
13b 側壁ヒータ
14 ステージ
14a ステージヒータ
14b 流路
15 支持棒
16 排気口
17 ガス供給口
18 温度センサ
18a ケーブル
20a、20b 原料供給源
21a、21b 気化器
22a、22b 流量制御器
23a、23b バルブ
24a、24b 配管
30 昇降機構
40 チラーユニット
41a、41b 配管
50 排気装置
60 温度センサ
61 ケーブル
Claims (7)
- 蒸着重合により被処理基板に重合体の膜を成膜する成膜装置において、
前記被処理基板が収容される処理容器内に設けられ、前記被処理基板が載置されるステージと、
前記ステージ内に設けられ、前記ステージ上に載置された前記被処理基板を加熱するステージヒータと、
前記ステージに対向する前記処理容器の天板に設けられた天板ヒータと、
前記ステージヒータの温度を第1の温度単位で制御することにより、前記被処理基板の温度を前記第1の温度単位で制御し、前記天板ヒータの温度を第2の温度単位で制御することにより、前記天板を介して放射される輻射熱によって前記被処理基板の温度を前記第1の温度単位より細かい温度単位で制御する制御装置と
を備える成膜装置。 - 前記被処理基板は、略円板状であり、
前記天板ヒータは、前記被処理基板の中心軸を中心とする円の径方向および周方向の少なくともいずれかの方向に分割されており、
前記制御装置は、分割されたそれぞれの前記天板ヒータの温度を前記第2の温度単位でそれぞれ独立に制御する請求項1に記載の成膜装置。 - 前記処理容器の側壁に設けられた側壁ヒータをさらに備え、
前記制御装置は、
前記側壁ヒータの温度を前記第2の温度単位で制御することにより、前記側壁を介して放射される輻射熱により、前記被処理基板の温度を前記第1の温度単位より細かい温度単位で制御する請求項1または2に記載の成膜装置。 - 前記被処理基板は、略円板状であり、
前記側壁ヒータは、前記被処理基板の中心軸を中心とする円の周方向に分割されており、
前記制御装置は、分割されたそれぞれの前記側壁ヒータの温度を前記第2の温度単位でそれぞれ独立に制御する請求項3に記載の成膜装置。 - 前記ステージを昇降させることにより前記ステージと前記天板との間の距離を変更する昇降機構をさらに備え、
前記制御装置は、
前記昇降機構を制御して前記ステージと前記天板との間の距離を変更することにより前記天板および前記側壁から前記被処理基板へ放射される輻射熱の量を変更する請求項3または4に記載の成膜装置。 - 前記第1の温度単位および前記第2の温度単位は、1℃単位であり、
前記第1の温度単位より細かい温度単位は、0.1℃単位以下の温度単位である請求項1から5のいずれか一項に記載の成膜装置。 - 被処理基板が収容される処理容器内に設けられ、前記被処理基板が載置されるステージと、
前記ステージ内に設けられ、前記ステージ上に載置された前記被処理基板を加熱するステージヒータと、
前記ステージ内に設けられ、前記被処理基板の温度を測定するセンサと、
前記ステージに対向する前記処理容器の天板に設けられた天板ヒータと、
前記ステージヒータおよび前記天板ヒータの温度を制御する制御装置と
を備え、蒸着重合により前記被処理基板に重合体の膜を成膜する成膜装置において、
前記制御装置は、
前記ステージヒータの温度を第1の温度単位で制御する第1の制御工程と、
前記センサによって測定された前記被処理基板の温度を取得する取得工程と、
測定された前記被処理基板の温度と目標温度との差が所定値以下となるように、前記天板ヒータの温度を第2の温度単位で制御することにより、前記天板を介して放射される輻射熱によって前記被処理基板の温度を前記第1の温度単位より細かい温度単位で制御する第2の制御工程と
を実行する温度制御方法。
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