Patent ID: 7790521
Filing Date: 2010-09-07
Classification: H01L

Abstract:
1. A method of manufacturing a thin film semiconductor device comprising the steps of: forming a light reflection and absorption layer for reflecting and absorbing light on a substrate; patterning the light reflection and absorption layer in a prescribed shape; forming an insulating film covering the patterned light reflection and absorption layer; forming a semiconductor thin film containing a polycrystalline grain on the insulating film; and laser annealing the entire surface of the semiconductor thin film by irradiating a pulse oscillated laser light to crystallize the semiconductor thin film, wherein an external region of the semiconductor thin film located outside the pattern of the light reflection and absorption layer is not melted by the laser annealing and an internal region of the semiconductor thin film located inside the pattern of the light reflection and absorption layer is melted by the laser annealing, and after the internal region has been melted, lateral growth proceeds inwardly from a boundary between the external region and the internal region while making a polycrystalline grain in the external region act as a nucleus.