Patent ID: 7696520

Claim:
An electronic device comprising an organic thin film transistor, the organic thin film transistor comprising: a source electrode; a drain electrode spaced apart from the source electrode; an organic semiconductor layer that contacts the source and drain electrodes, the organic semiconductor layer comprising a channel portion positioned between the source and drain electrodes and a non-channel portion outside the channel portion; a gate electrode insulated from the source electrode, the drain electrode, and the organic semiconductor layer; and a gate insulating film that insulates the gate electrode from the source electrode, the drain electrode, and the organic semiconductor layer, wherein the non-channel portion of the organic semiconductor layer comprises a first semiconductor layer and a second semiconductor layer, wherein the channel portion of the organic semiconductor layer comprises the first semiconductor layer, wherein the first semiconductor layer directly contacts the source and drain electrodes, wherein the first semiconductor layer comprises a first material, and wherein the second semiconductor layer comprises a second material which is substantially different from the first material, wherein the second semiconductor layer does not extend into the channel portion of the organic semiconductor layer between the source and drain electrodes.