JP4584074B2 - 半導体装置の作製方法 - Google Patents
半導体装置の作製方法 Download PDFInfo
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- JP4584074B2 JP4584074B2 JP2005249293A JP2005249293A JP4584074B2 JP 4584074 B2 JP4584074 B2 JP 4584074B2 JP 2005249293 A JP2005249293 A JP 2005249293A JP 2005249293 A JP2005249293 A JP 2005249293A JP 4584074 B2 JP4584074 B2 JP 4584074B2
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- semiconductor film
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Description
本実施の形態においては、レーザ光(以下、レーザビームとも示す。)を照射して、所望の形状を有する半導体領域の形成工程を図1、図22、図24、及び図25を用いて説明する。
本実施の形態では、実施の形態1とは異なる工程により、所望の形状を有する半導体領域の形成する工程を、図2を用いて説明する。本実施の形態では、実施の形態1と比較して、第2の絶縁層の除去工程と、第3の絶縁層の形成工程との順序が異なる。
的には半導体酸化物層があげられる。第3の絶縁層141の膜厚は、後に半導体膜103をエッチングするマスクとして機能するため、第3の絶縁層141の膜厚は、第2の絶縁層104の膜厚の2倍以上であることが好ましい。また、第3の絶縁層141は、緻密な絶縁層であることが好ましく、第2の絶縁層と比較してエッチングレートが小さく、代表的にはエッチングレートが半分以下の絶縁層であることが好ましい。
本実施の形態では、実施の形態1又は実施の形態2とは結晶状態が異なる半導体領域を形成する工程を、図3を用いて説明する。なお、本実施の形態では、実施の形態1の工程順序を用いて説明するが、実施の形態2の工程順序を用いることも可能である。
本実施の形態では、半導体素子の作製方法について図4を用いて説明する。本実施の形態では、半導体素子の代表例として、逆スタガ型TFTのチャネルエッチ型TFTを用いて説明する。また、以下の実施の形態4乃至実施の形態7では、実施の形態2を用いて半導体素子を形成する工程を説明するが、これに限定させることなく実施の形態1又は実施の形態3を適宜用いることが可能である。
本実施の形態では、半導体素子としてボトムゲートTFTにおいて、チャネル保護型TFTを、図5を用いて説明する。
本実施の形態においては、トップゲートTFTの中でも順スタガ型TFTの作製方法について、図6を用いて説明する。
本実施の形態ではトップゲートTFTの中でもコプレナー型TFTの作製方法について、図7を用いて説明する。
ここでは、保護材を用いて半導体膜の一部を酸化する工程を図24を用いて説明する。
Claims (2)
- 基板上に半導体膜を形成し、前記半導体膜上に形成される第1の酸化物層の一部上に第2の酸化物層を形成した後、前記第1の酸化物層の露出部を除去し、前記第2の酸化物層をマスクとして前記半導体膜をエッチングして、半導体領域を形成し、
前記第2の酸化物層は、酸素雰囲気又は空気雰囲気で、透光部及び遮光部を有するマスクを介して前記半導体膜及び前記第1の酸化物層にレーザ光を照射して形成することを特徴とする半導体装置の作製方法。 - 基板上に半導体膜を形成し、前記半導体膜上に形成される第1の酸化物層の一部上に第2の酸化物層を形成した後、前記第1の酸化物層の露出部を除去し、前記第2の酸化物層をマスクとして前記半導体膜をエッチングして、半導体領域を形成し、
前記第2の酸化物層は、酸素雰囲気又は空気雰囲気で、透光部及び遮光部を有するマスクを介して前記半導体膜及び前記第1の酸化物層にレーザ光を照射して形成し、
前記レーザ光の照射によって、前記半導体膜は結晶化されることを特徴とする半導体装置の作製方法。
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