JP5182603B2 - 有機トランジスタ及び有機トランジスタの製造方法 - Google Patents
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Description
図1は、本発明の有機トランジスタの一実施形態であるトップゲート構造の有機トランジスタ1の概略構成図である。有機トランジスタ1は、有機半導体からなる半導体層13と、該半導体層13と対向して設けられたゲート電極15と、半導体層13とゲート電極15とを絶縁するゲート絶縁膜14と、ゲート電極15と部分的に対向して設けられたソース電極11及びドレイン電極12と、ソース電極11及びドレイン電極12のゲート電極15と対向する部分に設けられたキャップ層16,17とを備えている。
図4は、有機トランジスタ1の製造方法の第2実施形態の説明図である。本実施形態ではまず、図4(a)に示すように、基板10上に導電膜21及び絶縁膜23が順に積層され、絶縁膜23上にマスク材24及び25が形成される。マスク材としては、上述したポリメタクリル酸メチル等のレジストが用いられる。マスク材24,25は、絶縁膜23上にレジストを形成し、該レジストを露光処理及び現像処理することにより形成される。絶縁膜23は、後述のエッチング工程でキャップ層16,17となるものである。そのため、絶縁膜23の材料としては、絶縁性の高い無機絶縁材料が用いられる。
Claims (7)
- 有機半導体からなる半導体層と、
前記半導体層とゲート絶縁膜を介して設けられたゲート電極と、
前記半導体層を介して対向配置されたソース電極及びドレイン電極と、
を有し、
前記ソース電極と前記ゲート電極及び前記ドレイン電極と前記ゲート電極とはそれぞれ前記ゲート絶縁膜を介して部分的に対向すると共に、
前記ソース電極と前記ゲート絶縁膜との間及び前記ドレイン電極と前記ゲート絶縁膜との間に前記ゲート絶縁膜とは異なる絶縁材料からなるキャップ層が設けられ、
前記ソース電極と前記ゲート電極との対向部分及び前記ドレイン電極と前記ゲート電極との対向部分において前記キャップ層と前記ゲート電極との対向部分には前記半導体層が設けられておらず、
前記半導体層は、前記ソース電極と前記ドレイン電極との間に設けられており、
前記半導体層と前記ゲート絶縁膜との界面は、前記ソース電極と前記キャップ層との境界部及び前記ドレイン電極と前記キャップ層との境界部に配置されていることを特徴とする有機トランジスタ。 - 前記キャップ層は、前記ゲート絶縁膜よりも抵抗の高い材料によって形成されていることを特徴とする請求項1に記載の有機トランジスタ。
- 前記キャップ層は、有機絶縁材料又は酸化シリコンによって形成されていることを特徴とする請求項1又は2に記載の有機トランジスタ。
- 基板上に導電膜を形成する工程と、
前記導電膜上に絶縁材料からなるキャップ層を形成する工程と、
前記キャップ層をマスクとして前記導電膜をエッチングし、前記キャップ層の配置された領域にソース電極及びドレイン電極を形成する工程と、
前記ソース電極と前記ドレイン電極との間に有機半導体からなる半導体層を形成する工程と、
前記ソース電極、前記ドレイン電極、前記半導体層及び前記キャップ層を覆ってゲート絶縁膜を形成する工程と、
前記ゲート絶縁膜上にゲート電極を形成する工程と、を備え、
前記ソース電極と前記ゲート電極との対向部分及び前記ドレイン電極と前記ゲート電極との対向部分において前記キャップ層と前記ゲート電極との対向部分には前記半導体層が設けられておらず、
前記半導体層は、前記ソース電極と前記ドレイン電極との間に設けられており、
前記半導体層と前記ゲート絶縁膜との界面は、前記ソース電極と前記キャップ層との境界部及び前記ドレイン電極と前記キャップ層との境界部に配置されていることを特徴とする有機トランジスタの製造方法。 - 前記キャップ層は、前記導電膜上に絶縁膜を形成し、前記絶縁膜上にレジストを形成した後、前記レジストをマスクとして前記絶縁膜をエッチングすることにより形成されることを特徴とする請求項4に記載の有機トランジスタの製造方法。
- 前記半導体層は、前記ソース電極と前記ドレイン電極との間に前記有機半導体を含む溶液を配置することにより形成され、
前記キャップ層は、前記溶液に対して撥液性を有する材料によって形成されることを特徴とする請求項4又は5に記載の有機トランジスタの製造方法。 - 前記半導体層は、前記ソース電極と前記ドレイン電極との間に前記有機半導体を含む溶液を配置することにより形成され、
前記半導体層を形成する前に、前記キャップ層の表面に前記溶液に対して撥液性を付与するための表面処理が施されることを特徴とする請求項4又は5に記載の有機トランジスタの製造方法。
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