Patent ID: 6599791
Filing Date: 2003-07-29
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device comprising at least one first P-channel thin film transistor for switching a pixel electrode, and a driver circuit including at least two second P-channel thin film transistors for driving said first P-channel thin film transistor, said method comprising the steps of:forming a semiconductor film comprising silicon on an insulating surface; forming an insulating film on said semiconductor film; selectively introducing an impurity comprising boron into a selected portion of said semiconductor film through said insulating film by ion doping; removing said insulating film after the introduction of said impurity; crystallizing said semiconductor film after the introduction of said impurity; patterning said semiconductor film into at least one first semiconductor island to form said first P-channel thin film transistor and at least two second semiconductor islands to form said second P-channel thin film transistor, wherein only one of said two second semiconductor islands is included in said portion of the semiconductor film so that a channel region of said only one of the two second thin film transistor is doped with said boron while a channel region of the other one of the two second thin film transistors is not doped with said boron.