Patent ID: 7704890
Filing Date: 2010-04-27
Classification: H01L

Abstract:
1. A method for fabricating a thin film transistor (TFT), comprising: forming a poly-silicon layer over a substrate; forming a photoresist layer on the poly-silicon layer, wherein the photoresist layer has a pattern for exposing a part of the poly-silicon layer, and the pattern has a varied thickness; patterning the poly-silicon layer by using the photoresist layer as an etching mask to define a poly-silicon island; removing a part of the thickness of the photoresist layer for exposing a part of the poly- silicon island, wherein a portion of the photoresist layer is remained; performing a first ion implanting on the exposed part of the poly-silicon island by using the remained portion of photoresist layer as an implanting mask to form a source and a drain, wherein a channel is defined between the source and drain; removing the residue photoresist layer; forming a gate insulating layer over the substrate and the poly-silicon island; forming a gate on the gate insulating layer; forming a patterned dielectric layer over the gate, wherein the patterned dielectric layer exposes parts of the source and drain; and forming a conductive layer on the patterned dielectric layer, wherein the conductive layer is electrically connected with the source and drain.