Patent ID: 6713323
Filing Date: 2004-03-30
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device having a pixel portion and a driver circuit provided on an insulating surface, comprising the steps of:adding a metal element to a semiconductor film comprising amorphous silicon over a substrate; crystallizing the semiconductor film added with the metal element; forming an insulating film on the semiconductor film; forming an electrode having a tapered portion on the insulating film so that the electrode overlaps the semiconductor film; forming a first impurity region by selectively adding an impurity element imparting one conductivity type to the semiconductor film through the tapered portion of the electrode; selectively forming a second impurity region containing the impurity element imparting one conductivity type and a rare gas element in the semiconductor film in the pixel portion by providing a mask, and simultaneously forming the second impurity region in the driver circuit by using the electrode as a mask in a self-alignment manner; and selectively removing or reducing the metal element in the semiconductor film having the crystalline structure by gettering the metal element into the second impurity region.