Patent ID: 6972221
Filing Date: 2005-12-06
Classification: H01L

Abstract:
1. A thin film semiconductor device manufacturing method comprising the steps of: depositing amorphous silicon having a predetermined film thickness on an insulation substrate via a protection film or directly on said insulation substrate; polycrystallizing said amorphous silicon by using a laser to hereby form a polycrystal silicon layer; patterning said polycrystal silicon layer into a plurality of islands to hereby form an N-channel MOS transistor forming region and a P-channel MOS transistor forming region; injecting a second or first conductivity type of an impurity into said N-channel MOS transistor forming region to hereby form a P-type or an N-type of first region; injecting a first or a second conductivity type of an impurity into said P-channel MOS transistor forming region to hereby form an N-type or a P-type of second region; forming a first gate insulating film on said first region in said N-channel MOS transistor forming region and a second gate insulating film on said second region in said P-channel MOS transistor forming region; depositing polysilicon on said first and second gate insulating films; injecting a first conductivity type of an impurity into said polysilicon on said first gate insulating film in said N-channel MOS transistor forming region to hereby make an N-type of said polysilicon on said first gate insulating film; injecting a second conductivity type of an impurity into said polysilicon on said second gate insulating film in said P-channel MOS transistor forming region to hereby make a P-type of said polysilicon on said second gate insulating film; forming a metal film or a silicide film on each of said N-type and P-type of said polysilicons and patterning said metal film or said silicide film to hereby form a first gate electrode on said N-type of said polysilicon and form a second gate electrode on said P-type of said polysilicon; and injecting a first conductivity type of an impurity in said N-channel MOS transistor forming region and a second conductivity type of an impurity in said P-channel MOS transistor forming region to hereby form source and drain regions respectively.