JP2021136445A - 成膜用霧化装置及びこれを用いた成膜装置並びに半導体膜 - Google Patents
成膜用霧化装置及びこれを用いた成膜装置並びに半導体膜 Download PDFInfo
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- JP2021136445A JP2021136445A JP2021016959A JP2021016959A JP2021136445A JP 2021136445 A JP2021136445 A JP 2021136445A JP 2021016959 A JP2021016959 A JP 2021016959A JP 2021016959 A JP2021016959 A JP 2021016959A JP 2021136445 A JP2021136445 A JP 2021136445A
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Abstract
Description
図1に、本発明に係る成膜用霧化装置100を示す。成膜用霧化装置100は、原料溶液114を収容する原料容器111と、原料容器111の内部と外部を空間的に接続し、且つその下端が原料容器111内において原料溶液114の液面に触れないように設置された筒状部材113と、超音波を照射する超音波発生源(超音波振動板)121を一つ以上有する超音波発生器120と、超音波を原料溶液114に中間液123を介して伝播させる液槽122とを具備する。
本発明は、さらに図1および図2で説明した成膜用霧化装置を用いた成膜装置を提供する。
本発明に係る半導体膜は、Gaを含みコランダム型結晶構造を有する半導体膜であり、半導体膜の表面における直径0.3μm以上のパーティクル密度が50個/cm2以下のものである。直径0.3μm以上のパーティクルは、半導体膜をもとに半導体装置としたときに、特性に大きな影響を与えるものである。上記のような、直径0.3μm以上のパーティクル密度を有する半導体膜は、半導体装置製造に適した高品質なものとなる。
図1および図2に示した成膜用霧化装置と、図3に示した成膜装置を用いて、α−酸化ガリウムの成膜を行った。
窒素ガス流量を10L/minとした以外は実施例1と同様に成膜を行った。
成膜装置に図4で示した成膜装置を用いた他は、実施例1と同様の装置および原料溶液を使用してα−酸化ガリウムの成膜を行った。ミスト吐出ノズルには石英製のものを使用した。サセプターにはアルミ製ホットプレートを使用し、基板を450℃に加熱した。次にサセプターを10mm/sの速度でミスト吐出ノズルの下を水平方向に往復駆動させ、さらにミスト吐出ノズルからサセプター上の基板へ混合気を5L/min供給して60分間成膜を行った。
超音波を、筒状部材の筒内に向けて超音波発生器から直上に照射した他は、実施例1と同様に成膜を行った。
超音波を、筒状部材の筒内に向けて超音波発生器から直上に照射した以外は実施例2と同様に成膜を行った。
成膜時間、すなわち、成膜室にミストと窒素ガスの混合気を供給する時間を120分間としたこと以外は実施例1と同じ条件で成膜を行い、膜厚1μm以上の半導体膜の成膜を行った。そして、成膜して得た膜の表面のパーティクル(直径0.3μm以上)密度を、基板検査機(KLA candela−CS10)で評価した。
成膜時間を120分間としたこと以外は実施例2と同条件で成膜し、実施例4と同条件で評価を行った。
成膜時間を120分間としたこと以外は実施例3と同条件で成膜し、実施例4と同条件で評価を行った。
成膜時間を120分間としたこと以外は比較例1と同条件で成膜し、実施例4と同条件で評価を行った。
成膜時間を120分間としたこと以外は比較例2と同条件で成膜し、実施例4と同条件で評価を行った。
113…筒状部材、 114…原料溶液、 120…超音波発生器、
121…超音波発生源、 121a…角度調節機構、 122…液槽、
123…中間液、 131…キャリアガス、 132…ミスト、 133…混合気、
201…原料溶液、 202…液柱、 210…原料容器、 220…筒状部材、
300…成膜装置、 311…キャリアガス供給部、 313、324…配管、
320…成膜用霧化装置(霧化手段)、 321…原料溶液、 322…ミスト、
330…成膜手段、 331…成膜室、 332…サセプター、 333…加熱手段、
334…基体、 340…排気手段、 351…キャリアガス、 352…混合気、
400…成膜装置、 422…ミスト、 430…成膜手段、 431…ノズル、
432…サセプター、 433…加熱手段、 434…基体、 435…排気手段、
452…混合気。
Claims (9)
- 原料溶液を収容する原料容器と、前記原料容器の内部と外部を空間的に接続し、且つその下端が前記原料容器内において前記原料溶液の液面に触れないように設置された筒状部材と、超音波を照射する超音波発生源を一つ以上有する超音波発生器と、前記超音波を前記原料溶液に中間液を介して伝播させる液槽とを有する成膜用霧化装置であって、
前記超音波発生源の超音波射出面の中心線をuとし、
前記中心線uと、前記筒状部材の側壁面の延長を含む、前記筒状部材の側壁面がなす面との交点Pが、前記筒状部材の下端点Bより下になるように超音波発生源が設けられていることを特徴とする成膜用霧化装置。 - 前記中心線uが前記原料容器側壁を通るように超音波発生源が設けられていることを特徴とする請求項1に記載の成膜用霧化装置。
- 前記交点Pと前記下端点Bの距離が10mm以上となるように超音波発生源が設けられていることを特徴とする請求項1又は請求項2に記載の成膜用霧化装置。
- 前記交点Pと前記下端点Bの距離が25mm以上となるように超音波発生源が設けられていることを特徴とする請求項1から請求項3のいずれか1項に記載の成膜用霧化装置。
- 原料溶液を霧化して原料ミストを形成する霧化手段と、前記ミストを基体に供給して前記基体上に膜を形成する成膜手段とを少なくとも具備する成膜装置であって、
前記霧化手段として請求項1から請求項4のいずれか1項に記載の成膜用霧化装置を具備することを特徴とする成膜装置。 - Gaを含みコランダム型結晶構造を有する半導体膜であって、
前記半導体膜の表面における直径0.3μm以上のパーティクル密度が50個/cm2以下であることを特徴とする半導体膜。 - 前記Gaを含みコランダム型結晶構造を有する半導体膜がα−Ga2O3であることを特徴とする請求項6に記載の半導体膜。
- 前記半導体膜の表面積が50cm2以上であることを特徴とする請求項6又は7に記載の半導体膜。
- 前記半導体膜の膜厚が1μm以上であることを特徴とする請求項6から8のいずれか一項に記載の半導体膜。
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