Patent ID: 6740569
Filing Date: 2004-05-25
Classification: H01L,Y10S

Abstract:
A method of fabricating a polysilicon film by an excimer laser annealing (ELA) process, the method comprising the following steps:providing a substrate; forming an amorphous silicon film on the substrate; measuring the thickness of the amorphous silicon film to obtain a thickness profile of the amorphous silicon film and define the amorphous silicon film as a first region located in a center and a second region located in a periphery, the amorphous silicon film in the first region having a first thickness and the amorphous silicon film in the second region having a tilt sidewall; determining a position of a process boundary of the excimer laser annealing process according to the thickness profile of the tilt sidewall, the amorphous silicon film in the process boundary having a second thickness smaller than the first thickness; and performing the excimer laser annealing process to crystallize the amorphous silicon film inside the process boundary into a polysilicon film.