Patent ID: 6455874
Filing Date: 2002-09-24
Classification: H01L

Abstract:
A thin film transistor (â€œTFTâ€ ) for a liquid crystal display device, comprising:a substrate; a buffer layer on the substrate; an amorphous silicon layer having a pure amorphous silicon area and doped amorphous silicon areas, the pure amorphous silicon area having vertical offsets in both sides thereof, the doped amorphous silicon areas having source and drain areas, the doped amorphous silicon areas doped by a dopant, the source and drain areas positioned on both sides of the pure amorphous silicon area and etched to expose the vertical offsets; an oxidized layer on the pure amorphous silicon area; a polycrystalline silicon layer on the oxidized layer; a gate insulating layer on the polycrystalline silicon layer; a gate electrode on the gate insulating layer; an interlayer insulator having first and second contact holes, the interlayer insulator covering the amorphous silicon layer, the oxidized layer, the polycrystalline silicon layer, the gate insulating layer, and the gate electrode; and source and drain electrodes contacting the source area through the first contact hole and the drain area through the second contact hole, respectively.