Patent ID: 7393734
Filing Date: 2008-07-01
Classification: H01L

Abstract:
1. 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 dielectric layer over the first polysilicon layer, wherein the dielectric layer fills the second opening and a recess is formed over a portion of the dielectric layer above the second opening; forming a second amorphous silicon layer over the dielectric layer; and performing a second annealing to transform the second amorphous silicon layer into a second polysilicon layer, wherein the second opening induces a thermal difference so as to cause a crystallizing direction for the second amorphous silicon layer.