Patent ID: 7863600

Claim:
A field-effect transistor comprising: a gate electrode; a gate-insulating layer; source/drain electrodes; and an organic semiconductor layer constituting a channel region, wherein the source/drain electrodes each include a conductive portion composed of a metal, and an organic conductive material layer which is doped with a dopant, thereby increasing the conductivity of the organic conductive material layer, wherein the channel region includes the organic semiconductor layer located between the source/drain electrodes, wherein the channel region and each of the conductive portions is electrically connected through the organic conductive material layer, and wherein for each source/drain electrode the organic conductive material layer covers any one of: (a) a side surface of the conductive portion facing another source/drain electrode; (b) a bottom surface and the side surface of the conductive portion; and (c) a top surface and the bottom surface of the conductive portion, and wherein for each source/drain electrode at least one of the side surface and the top surface is not covered with the organic conductive material layer.