Patent ID: 7045817
Filing Date: 2006-05-16
Classification: H01L

Abstract:
1. A TFT electrode structure capable of preventing metal diffusion, the structure comprising: a first metal layer on a substrate, wherein the first metal layer after being etched forms a gate electrode of the TFT; a transparent conducting electrode in direct contact with, and being disposed on the first metal layer; a dielectric layer in direct contact with, and being disposed on the transparent conducting electrode, wherein the dielectric layer is an insulating layer; an amorphous silicon layer on the dielectric layer; and a N+ amorphous silicon layer on the amorphous silicon layer, wherein the N+ amorphous silicon layer and amorphous silicon layer after being etched form a island and a channel of the TFT; a second metal layer on the amorphous silicon layer, wherein the second metal layer after being etched forms a source and a drain of the TFT; wherein the transparent conducting electrode is formed after the formation of the first metal layer, so that the transparent conducting electrode completely covers the first metal layer to prevent any contact between the first metal layer and the dielectric layer, thereby blocking metallic ion diffusion from the first metal layer during a fabrication of the TFT.