Patent ID: 7148093
Filing Date: 2006-12-12
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising the steps of: providing an amorphous semiconductor film including a catalyst element in at least a portion thereof, the catalyst element being capable of promoting crystallization of the amorphous semiconductor film; performing a first heat treatment on the amorphous semiconductor film so as to crystallize at least a portion of the amorphous semiconductor film, thereby obtaining a semiconductor film including a crystalline region; patterning the semiconductor film to form an island-shaped semiconductor layer including the crystalline region; forming a gate insulating film on the island-shaped semiconductor layer; selectively thinning or selectively removing only a portion of the gate insulating film that is located outside a region of the island-shaped semiconductor layer where a channel region, a source region and a drain region are formed; forming a gettering region capable of attracting the catalyst element in a region outside the region of the island-shaped semiconductor layer where the channel region, the source region, and the drain region are formed; doping the crystalline region of the island-shaped semiconductor layer with an impurity for forming the source region and the drain region; and performing a second heat treatment so as to move at least a portion of the catalyst element in the island-shaped semiconductor layer to the gettering region.