Patent ID: 8853017

Claim:
An organic thin film transistor, comprising: a substrate; a gate electrode on the substrate; an organic insulating layer on the substrate, the organic insulating layer comprising an organic polymer material; source and drain electrodes, each including (a) a first layer comprising at least one of nickel (Ni) and copper (Cu) formed as a single layer by electroless plating directly on only a surface of the organic insulating layer, and (b) a second layer comprising a metal material, the second layer being formed by electroless plating as a separate layer over the first layer such that all top and side surfaces of the first layer are covered by the metal material of the second layer; and an organic semiconductor layer comprising an organic semiconductor material in a region between the source electrode and the drain electrode, wherein, the gate electrode underlies at least the region extending between the source and drain electrodes, the second layers have respective ohmic contacts with the organic semiconductor layer that are lower in resistance than those which would be had with the first layer alone, a surface of the organic insulating layer contains aminosilane mixed therein at least at portions of the organic polymer material on which the source and drain electrodes are disposed, and the organic insulating layer is without damage that would otherwise result from a sputtering or firing process.