Patent ID: 6653179
Filing Date: 2003-11-25
Classification: H01L

Abstract:
A method for manufacturing a thin film semiconductor device comprising:a film-making step for forming a semiconductor thin film of a non-single crystal on one surface of an insulating substrate; and an annealing step for irradiating laser light and changing-said semiconductor thin film of the non-single crystal into a polycrystal, said annealing step irradiating laser light with a pulse width not shorter than 50 ns onto said semiconductor thin film by using an excimer laser source, wherein said annealing step shaped the laser light to have a rectangular cross-sectional area whose each side is not smaller than a predetermined dimension, and then sequentially irradiates the surface of the semiconductor thin film while moving laser light step by step so that the rectangular cross-sectional areas partly overlap along their sides.