Patent ID: 7382040

Claim:
A field effect transistor comprising: a semiconductor layer containing an organic substance; a first electrode; a second electrode; a third electrode, and an insulating layer interposed between the first electrode and the third electrode, wherein the first electrode is arranged above the semiconductor layer, the second electrode is arranged below the semiconductor layer, the third electrode is arranged beside the semiconductor layer, the semiconductor layer is connected electrically to two electrodes selected from the first electrode, the second electrode, and the third electrode, the first electrode lies over the whole semiconductor layer and extends beyond a periphery of the semiconductor layer, the first electrode is a drain/source electrode and is connected electrically to the semiconductor layer, the second electrode is a gate electrode, the third electrode is a source/drain electrode and is connected electrically to the semiconductor layer, and L≧10d is satisfied where L is a length by which the first electrode extends beyond the periphery of the semiconductor layer and d is a thickness of the insulating layer.