Patent ID: 8178882

Claim:
A thin film transistor having a buffer layer for promoting electron mobility, comprising: a substrate; a buffer layer, comprising: an amorphous silicon layer, deposited on the substrate; and a buffer dielectric layer, deposited on the amorphous silicon layer; an active layer, deposited on the buffer dielectric layer, wherein the active layer is continuous, crystallized by excimer laser annealing (ELA) and includes a source region, a drain region and a region therebetween, the source and drain regions having higher doping concentration than that of the region therebetween; an insulating layer, covered conformally on the active layer, the amorphous silicon layer, the buffer dielectric layer and the side walls of the active layer; a conductive layer, deposited on the insulating layer above parts of the active layer; and a dielectric layer, completely covering the buffer dielectric layer and the conductive layer.