Patent ID: 6372039
Filing Date: 2002-04-16
Classification: B23K,C30B,H01L

Abstract:
A method of irradiating a pulse laser beam onto a non-single crystal semiconductor thin film, comprising the steps of:irradiating the semiconductor thin film with a pulse laser beam comprising a first, second, and third beam profile regions, said first beam profile region having a first energy density that is lower than a micro-crystallization threshold value Ea of an amorphous semiconductor, said first beam profile region forming a polycrystallization region, said second beam profile region having a second energy density which is greater than or equal to the micro-crystallization threshold value Ea and is lower than a micro-crystallization threshold value Ep of a polycrystalline semiconductor, said second beam profile region forming a first micro-polycrystallization region from an amorphous semiconductor region; and said third beam profile region having a third energy density which is greater than or equal to the micro-crystallization threshold value Ep, said third beam profile region forming a second micro-polycrystallization region from a polycrystalline semiconductor region; and scanning said pulse laser beam so that a first beam spot and a second beam spot partially overlap.