Patent ID: 6388291
Filing Date: 2002-05-14
Classification: H01L

Abstract:
A semiconductor device comprising an n-channel type thin film transistor and a p-channel type thin film transistor, each comprising:a semiconductor film formed over a substrate having an insulating surface; a pair of source and drain regions in said semiconductor film; a channel region in said semiconductor film; and a gate insulating film adjacent to said channel region and a gate electrode adjacent to said channel region with said gate insulating film interposed therebetween, wherein said n-channel type thin film transistor has at least one lightly doped region between said channel region and at least one of said source and drain regions, wherein said p-channel type thin film transistor has no lightly doped region between said channel region and either of said source and drain regions in said semiconductor film, and wherein said lightly doped region has a dose amount between 1Ã—1013 and 5Ã—1014 atoms/cm2.