Patent ID: 7795611

Claim:
A field effect organic transistor comprising a source electrode, a drain electrode, a gate electrode, a gate insulating layer and an organic semiconductive layer, the organic semiconductive layer comprising a first organic semiconductive layer and a second organic semiconductive layer, wherein the source electrode and the drain electrode are arranged on the same surface of the gate insulating layer; the first organic semiconductive layer and the second organic semiconductive layer are laminated in a channel region between the source electrode and the drain electrode; the first organic semiconductive layer is arranged at a position nearer than the second organic semiconductive layer to the gate electrode; the mobility in the first organic semiconductive layer is higher than the mobility in the second organic semiconductive layer; the first organic semiconductive layer comprises pentacene; the second organic semiconductive layer comprises copper phthalocyanine; and the first organic semiconductive layer comes into contact with only side portions of the source electrode and the drain electrode; a portion of the second organic semiconductive layer is arranged in the channel region; and the second organic semiconductive layer comes into contact with a top surface of each of the source electrode and the drain electrode.