Patent ID: 7071083

Claim:
A method of fabricating a polysilicon film by an excimer laser crystallization process, the method comprising following steps: providing a substrate defined with a first region and a second region; forming an amorphous silicon film on the substrate; forming a mask layer on the amorphous silicon film; performing a first photo-etching process to remove the mask layer in the first region; forming a heat-retaining capping layer covering the mask layer in the second region and the amorphous silicon film in the fist region; and performing the excimer laser crystallization process to make the amorphous silicon film, covered by the heat-retaining capping layer, in the first region crystallize to a polysilicon film, using an excimer laser to irradiate the amorphous film to make the amorphous silicon film in the second region, which is covered with the mask layer, become partially melted and make the amorphous film in the first region, which is not covered with the mask layer, become completely melted, and grains are grown laterally toward the first region from the interface between the first region and the second region.