Patent ID: 7410889

Claim:
A method of fabricating a polysilicon (poly-Si) thin film, comprising the steps of: forming a silicon layer on a substrate; forming a heat-retaining layer directly on the silicon layer, wherein the entire bottom surface of the heat-retaining layer is in direct contact with the entire top surface of the silicon layer; patterning at least one laser beam to produce a patterned laser beam with an energy density gradient occurring at the edges of the patterned laser beam, wherein the range of the energy density gradient is between 400 J/cm 3 and 3000 J/cm 3 ; irradiating the patterned laser beam with the energy density gradient to the heat-retaining layer so as to perform a laser heating process for inducing super lateral growth crystallization occurred in part of the silicon layer; and repeatedly moving the patterned laser beam to irradiate different positions of the substrate until the crystallization process for the full substrate is finished.