Patent ID: 7714324

Claim:
An organic thin film transistor (TFT) comprising: a substrate; a first insulating layer over the substrate; a source electrode and a drain electrode, each being disposed on an upper surface of the first insulating layer, the source and drain electrodes being spaced apart with a gap therebetween, each of the source and drain electrodes having a side surface facing the gap and an upper surface facing away from the substrate; an organic semiconductor layer overlying the source and drain electrodes, the organic semiconductor layer further comprising a portion filling the gap between the source and drain electrodes, the organic semiconductor layer consisting essentially of an organic semiconductor material; and a peel-off preventive layer comprising: a first portion interposed between the side surface of the source electrode and the portion of the organic semiconductor layer, a second portion interposed between the side surface of the drain electrode and the portion of the organic semiconductor layer, and a third portion interposed between the first insulating layer and the portion of the organic semiconductor layer, wherein the peel-off preventive layer is not disposed on the upper surfaces of the source and drain electrodes, and wherein the first to third portions of the peel-off preventive layer comprise the same material as one another, wherein at least one of the side surfaces of the source and drain electrodes is undercut such that a gap is formed between the at least one side surface and the first insulating layer, and wherein the peel-off preventive layer is within at least a portion of the gap.