Patent ID: 7534670
Filing Date: 2009-05-19
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device comprising: forming a first semiconductor film comprising an amorphous silicon over a substrate having an insulating surface; adding a material comprising a metal for promoting crystallization to the first semiconductor film; performing a first heating process to the first semiconductor film, thereby forming the first semiconductor film having a crystal structure; forming a barrier layer on a surface of the first semiconductor film having the crystal structure; forming a second semiconductor film containing a rare gas element by using a mixed gas of the rare gas and hydrogen on the barrier layer, whereby the second semiconductor film has low density to enhance etching selectivity with the first semiconductor film having the crystal structure; performing gettering through. a second heating process, thereby moving the metal for promoting crystallization to the second semiconductor film; removing the second semiconductor film; and irradiating the first semiconductor film having the crystal structure with laser light.