Patent ID: 7754523
Filing Date: 2010-07-13
Classification: G02F,H01L

Abstract:
1. A method for fabricating an organic thin film transistor comprising: forming a gate electrode on a substrate; forming a gate insulating layer on the substrate including the gate electrode; forming an organic film and an inorganic film on the gate insulating layer; coating a first photoresist film on the inorganic film; exposing the first photoresist film by irradiating light through a rear surface of the substrate; developing the exposed first photoresist film to form a first photoresist pattern at a region corresponding to the gate electrode; and etching the organic film and the inorganic film by using the first photoresist pattern as a first mask to form an organic active pattern including a thin film transistor channel; ashing the first photoresist pattern to form a second photoresist pattern having a width smaller than that of the first photoreist pattern; etching a part of the etched inorganic film using the ashed second photoresist pattern so that the area of upper surface of the inorganic film is smaller than that of the etched organic active pattern to expose a part of upper surface of the etched organic active pattern at the both end sides of the inorganic film; forming source and drain electrodes on the inorganic film and the exposed part of the organic active pattern; forming a passivation film on the entire surface of the substrate including the source and drain electrodes; forming a contact hole in the passivation film, the contact hole exposing a portion of the drain electrode; and forming a pixel electrode on the passivation film, wherein the source and drain electrodes are respectively formed of a single layer made of an opaque metal selected from the group consisting of Cu, Mo, Ta, Al, Cr, Ti, Al alloy, the opaque metal being contacted directly with the side surfaces of organic active pattern and the exposed part of the organic active pattern and the pixel electrode is electrically connected to the opaque metal to be directly contacted with the side surface of the organic active pattern through the contact hole.