JP6821291B2 - 光電変換装置、撮像システムおよび光電変換装置の製造方法 - Google Patents
光電変換装置、撮像システムおよび光電変換装置の製造方法 Download PDFInfo
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 317
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 12
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- MROCJMGDEKINLD-UHFFFAOYSA-N dichlorosilane Chemical compound Cl[SiH2]Cl MROCJMGDEKINLD-UHFFFAOYSA-N 0.000 description 1
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Description
まず、図1(a)を用いて光電変換装置ISの概要を説明する。光電変換装置ISはその全体または一部を成す光電変換デバイスICを含む。光電変換デバイスICは集積回路を有する半導体デバイスであり、光電変換装置は半導体装置である。半導体デバイスは半導体ウエハをダイシングすることで得られる半導体チップでありうる。光電変換デバイスは基板上に画素回路部PXAと周辺回路部PRAとを有することができる。画素回路部PXAには複数の画素回路が配され、周辺部PRAには駆動回路や信号処理回路などの周辺回路が配される。光電変換装置ISは光電変換デバイスICを収容するパッケージPKGをさらに備えることもできる。光電変換装置ISを用いて撮像システムSYSを構築できる。撮像システムSYSは、カメラや撮影機能を有する情報端末である。撮像システムSYSは、光電変換装置ISに結像する光学系OUを備えうる。撮像システムSYSは、制御装置CU、処理装置PU、表示装置DUおよび記憶装置MUの少なくともいずれかを備えうる。制御装置CUは光電変換装置ISを制御し、処理装置PUは光電変換装置ISから得られた信号を処理し、表示装置DUは光電変換装置ISから得られた画像を表示し、記憶装置MUは光電変換装置ISから得られた画像を記憶する。
図2〜4を用いて、光電変換装置の製造方法の一例を説明する。図2〜4は図1(b)に示した断面構造に対応する。
以下、光電変換装置の変形例を説明する。
11 シリコン層
17 絶縁体膜
21、25 酸化シリコン膜
171、211、251 重複部
19、23 導電部材
20、24 酸化シリコン層
Claims (16)
- 光電変換領域を有するシリコン層の上に、前記光電変換領域に重なる部分を有するように配された酸化シリコンを含む絶縁体膜と、
前記絶縁体膜の上に、前記光電変換領域に重なる部分を有するように配された酸化シリコン膜と、
前記絶縁体膜と前記酸化シリコン膜との間に配された導電部材と、
前記導電部材と前記酸化シリコン膜との間に配された酸化シリコン層と、を備え、
前記酸化シリコン膜の前記光電変換領域に重なる前記部分は前記絶縁体膜の前記光電変換領域に重なる前記部分に接しており、
前記酸化シリコン膜の水素濃度は前記酸化シリコン層の水素濃度よりも高く、
前記酸化シリコン膜の水素濃度は前記絶縁体膜の水素濃度よりも高く、
前記酸化シリコン膜の密度は前記酸化シリコン層の密度よりも低く、
前記絶縁体膜の密度は前記酸化シリコン層の密度よりも高いことを特徴とする光電変換装置。 - 前記酸化シリコン層は前記導電部材の上面に接する、請求項1に記載の光電変換装置。
- 前記導電部材は導電部とバリアメタル部とを有し、前記酸化シリコン層は前記導電部材の前記導電部の側面に接しない、請求項1又は2に記載の光電変換装置。
- 前記導電部材はチタン層を含む、請求項1乃至3のいずれか1項に記載の光電変換装置。
- 前記酸化シリコン膜の上に、前記光電変換領域に重なる部分を有するように配された、水素を含む第2絶縁体膜と、
前記第2絶縁体膜と前記酸化シリコン膜との間に配された第2導電部材と、をさらに備え、
前記第2導電部材の上面が前記第2絶縁体膜に接している、請求項1乃至4のいずれか1項に記載の光電変換装置。 - 前記第2絶縁体膜の上には、水素を含む誘電体膜が配されており、前記第2絶縁体膜の密度は、前記酸化シリコン層の密度および前記誘電体膜の密度よりも低い、請求項5に記載の光電変換装置。
- 請求項1乃至6のいずれか1項に記載の光電変換装置と、
前記光電変換装置に結像する光学系、前記光電変換装置を制御する制御装置、前記光電変換装置から得られた信号を処理する処理装置、前記光電変換装置から得られた画像を表示する表示装置および光電変換装置から得られた画像を記憶する記憶装置の少なくともいずれかと、を備える撮像システム。 - 光電変換領域を有するシリコン層の上に、プラズマCVD法を用いて酸化シリコンを含む絶縁体膜を形成する工程と、
前記絶縁体膜の上に導電体膜を形成する工程と、
前記導電体膜の上に、プラズマCVD法によって第1酸化シリコン膜を形成する工程と、
前記第1酸化シリコン膜をパターニングすることにより前記第1酸化シリコン膜からマスクパターンを形成する工程と、
前記マスクパターンを用いて前記導電体膜をパターニングすることにより前記導電体膜から導電部材を形成する工程と、
前記導電部材を覆うように、プラズマCVD法によって第2酸化シリコン膜を形成する工程と、
前記第2酸化シリコン膜が形成された前記シリコン層を熱処理する工程と、を有し、
前記第2酸化シリコン膜の成膜温度は、前記絶縁体膜の成膜温度よりも低く、
前記第2酸化シリコン膜の成膜時のプラズマ密度は前記第1酸化シリコン膜の成膜時のプラズマ密度よりも高く、
前記第1酸化シリコン膜の成膜時の水素濃度は、前記絶縁体膜の成膜時の水素濃度よりも高く、
前記絶縁体膜の密度は前記第1酸化シリコン膜の密度よりも高く、前記第2酸化シリコン膜の密度は前記第1酸化シリコン膜の密度よりも低いことを特徴とする光電変換装置の製造方法。 - 前記第2酸化シリコン膜の成膜時の成膜温度は前記第1酸化シリコン膜の成膜時の成膜温度よりも低い、請求項8に記載の光電変換装置の製造方法。
- 前記第2酸化シリコン膜の応力は前記第1酸化シリコン膜の応力よりも低い、請求項8または9に記載の光電変換装置の製造方法。
- 前記第1酸化シリコン膜の成膜時の原料ガスはTEOSガスであり、前記第2酸化シリコン膜の成膜時の原料ガスはシラン系ガスである、請求項8乃至10のいずれか1項に記載の光電変換装置の製造方法。
- 前記第2酸化シリコン膜は前記マスクパターンを覆うように形成され、
前記第2酸化シリコン膜の上に第3酸化シリコン膜を形成する工程を有する、請求項8乃至11のいずれか1項に記載の光電変換装置の製造方法。 - 前記第3酸化シリコン膜の前記光電変換領域に重なる部分が前記第2酸化シリコン膜の上に残存しないように、前記第3酸化シリコン膜および前記第2酸化シリコン膜を平坦化する工程を有する、請求項12に記載の光電変換装置の製造方法。
- 前記第3酸化シリコン膜の成膜時のプラズマ密度は前記第2酸化シリコン膜の成膜時のプラズマ密度よりも低いこと、請求項12または13に記載の光電変換装置の製造方法。
- 前記第2酸化シリコン膜の成膜時の原料ガスはシラン系ガスであり、前記第3酸化シリコン膜の成膜時の原料ガスはTEOSガスである、請求項12乃至14のいずれか1項に記載の光電変換装置の製造方法。
- 前記第2酸化シリコン膜を形成する工程の後に、シリコン化合物からなるマスクパターンをマスクとして用いずに、前記第2酸化シリコン膜の上に形成された導電体膜をパターニングする工程を有する、請求項8乃至15のいずれか1項に記載の光電変換装置の製造方法。
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