Patent ID: 7306980

Claim:
A method for fabricating an LDD thin film transistor, comprising: forming a semiconductor layer on the substrate; forming a metal film on the semiconductor layer; making a provisional gate electrode from the metal film by using a resist, which has been hardened and patterned by photolithography and postbaking; injecting a first concentration of impurities into the semiconductor layer by using, as a mask, the provisional gate electrode having the resist used to form the provisional gate electrode remaining on the provisional gate electrode; moving both ends of the resist on the provisional gate electrode in a channel direction toward the center of the resist by etching, thereby exposing surfaces of both ends of the provisional gate electrode in the channel direction; etching the exposed both ends of the provisional gate electrode while using the remaining resist as a mask; and injecting a lower concentration of impurities lower then the first concentration into the semiconductor layer while using, as a mask, a gate electrode completed by etching the both ends of the provisional gate electrode.