Patent ID: 8039842
Filing Date: 2011-10-18
Classification: H01L

Abstract:
1. A thin film transistor comprising: a gate electrode layer; a first insulating layer which is provided so as to cover the gate electrode layer; a pair of impurity semiconductor layers forming a source region and a drain region, which are provided with a distance therebetween and which at least partly overlap with the gate electrode layer; a microcrystalline semiconductor layer which is provided over the first insulating layer in part of a channel formation region and which at least partly overlaps with the gate electrode layer and does not overlap with the pair of impurity semiconductor layers; a second insulating layer which is provided between and in contact with the first insulating layer and the microcrystalline semiconductor layer; and an amorphous semiconductor layer which is provided over the first insulating layer so as to cover the second insulating layer and the microcrystalline semiconductor layer, wherein the first insulating layer is a silicon nitride layer and the second insulating layer is a silicon oxynitride layer.