<p>The thin film field effect transistor according to the invention includes a gate electrode (11); a gate insulator film (12) on gate electrode (11); a first organic electronic material film (13) containing a first organic electronic material on gate insulator film (12); a source electrode (15) and a drain electrode (14) spaced apart from each other on first organic electronic material film (13); first organic electronic material film (13) including a portion (16) between source electrode (15) and drain electrode (14), portion (16) being in contact with gate insulator film (12); portion (16) providing a current with a path, the current being controlled by the potential of gate electrode (11); a second organic electronic material film (30) in contact with the surface of first organic electronic material film (13) opposite to portion (16); and second organic electronic material film (30) containing a second organic electronic material and an electron acceptor or an electron donor. The thin film field effect transistor according to the invention facilitates accumulating electric charges in the channel on the gate insulator film and realizing a high response frequency.
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