Patent ID: 8183559

Claim:
An organic field effect transistor comprising: a first gate electrode over and in contact with an insulating surface over a substrate; a first gate insulating film over and in contact with the first gate electrode; a first source electrode and first drain electrode over and in contact with the first gate insulating film; an organic semiconductor film over and in contact with the first source electrode, the first drain electrode, and the first gate insulating film; a floating electrode in the organic semiconductor film; a second source electrode and a second drain electrode over and in contact with the organic semiconductor film; a second gate insulating film over and in contact with the organic semiconductor film; and a second gate electrode over and in contact with the second gate insulating film, wherein the floating electrode comprises: a negative pole side buffer layer which is an organic thin film layer comprising an alkali metal ion or an alkali earth metal ion; and a positive pole side buffer layer containing an acceptor type inorganic semiconductor material.