Patent ID: 7351619
Filing Date: 2008-04-01
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device comprising the steps of: forming a crystalline semiconductor film over a substrate; irradiating a first light to improve the crystallinity of said crystalline semiconductor film; patterning said crystalline semiconductor film to form a semiconductor island; introducing a first n-type impurity element into said semiconductor island to form a first impurity region; irradiating a second light to activate said first n-type impurity element in said first impurity region; forming a gate insulating film on said semiconductor island; forming a gate electrode on said gate insulating film after the introduction of said first n-type impurity element so that said gate electrode partially overlaps said first impurity region with said gate insulating film interposed therebetween; and introducing a second n-type impurity element into said semiconductor island to form a second impurity region by using said gate electrode as a mask.