Patent ID: 6340830
Filing Date: 2002-01-22
Classification: H01L

Abstract:
A semiconductor device comprising:at least a p-channel thin film transistor and an n-channel thin film transistor provided over a substrate having an insulating surface, wherein each of said p-channel thin film transistor and said n-channel thin film transistor comprises a pair of impurity regions, a channel region provided between said impurity regions, and a gate electrode provided over said channel region with a first gate insulating film therebetween, wherein only said n-channel thin film transistor further comprises a conductive layer below said channel region with a second insulating film therebetween, and wherein said conductive layer is overlapped with one of said pair of impurity regions of said n-channel thin film transistor and said conductive layer is not overlapped with the other of said pair of impurity regions of said n-channel thin film transistor.