Patent ID: 6635581
Filing Date: 2003-10-21
Classification: H01L

Abstract:
A method for forming a thin film transistor (TFT), comprising the steps of:(a) forming a gate electrode on a substrate; (b) forming an insulating layer on the gate electrode; (c) forming a semiconductor layer on the insulating layer; (d) forming a doped silicon layer on the semiconductor layer; (e) forming a metal layer on the doped silicon layer; (f) forming a first photoresist layer on the metal layer; (g) forming a second photoresist layer on the first photoresist layer; (h) performing an exposure process and a development process to form a first pattern on the first photoresist layer and a second pattern on the second photoresist layer at the same time; (i) performing an etching process to transfer the first pattern into the semiconductor layer, the doped silicon layer and the metal layer, and transfer the second pattern into the doped silicon layer and the metal layer; and (j) removing the first photoresist layer and the second photoresist layer.