Patent ID: 7115455

Claim:
A method of fabricating a polysilicon film, comprising: providing a substrate; forming an insulating layer, a first amorphous silicon layer and a cap layer over the substrate; performing a first annealing to transform the first amorphous silicon layer into a first polysilicon layer with at least a hole; removing the cap layer; removing a portion of the insulating layer within the hole to form a first opening within the insulating layer, wherein the hole and the first opening constitute a second opening; forming a second amorphous silicon layer over the first polysilicon layer and filling the second opening, wherein a recess is formed over a portion of the second amorphous silicon layer over the second opening; and performing a second annealing and forming a second polysilicon layer by partially fusing the second amorphous silicon layer and the first polysilicon layer, and taking an unfused portion of the second amorphous silicon layer as seeds for crystallization.