Patent ID: 7098089
Filing Date: 2006-08-29
Classification: H01L

Abstract:
1. A method of fabricating a thin film transistor using a metal induced lateral crystallization (MILC), the thin film transistor fabrication method comprising the steps of: forming an amorphous silicon film on an insulation substrate; patterning the amorphous silicon film, to thereby form a semiconductor layer; sequentially forming a gate insulation film and a gate electrode material on the substrate including the semiconductor layer; forming a photosensitive film pattern for forming a gate electrode on the upper surface of the gate electrode material, and then over-patterning the gate electrode material by a wet etching process to thereby form the gate electrode; primarily etching the gate insulation film by a dry etching process by using the photosensitive film pattern as an etching mask, and then patterning the dry-etched gate insulation film in the same width as that of the photosensitive film pattern; secondarily etching the primarily etched gate insulation film by the wet etching process, to thereby pattern the secondarily etched gate insulation film in a manner that the width of the at least gate insulation film is larger than that of the gate electrode and smaller than that of the photosensitive film pattern; forming a metal film for MILC crystallization on the entire surface of the substrate; removing the photosensitive film pattern; and ion-injecting high-concentration impurities into the semiconductor layer to thus form a high-concentration source/drain region and a low-concentration lightly doped drain (LDD) structure in the lower side of the gate insulation film which is exposed out of the gate electrode.