THIN FILM TRANSISTOR
First Claim
1. A semiconductor device comprising:
- a gate insulating layer over a gate electrode layer;
a microcrystalline semiconductor layer which is on and in direct contact with the gate insulating layer and overlaps the gate electrode layer;
a semiconductor layer over and in direct contact with the gate insulating layer so as to cover the microcrystalline semiconductor layer;
an amorphous semiconductor layer on and in direct contact with the semiconductor layer; and
a pair of impurity semiconductor layers forming a source region and a drain region, on and in direct contact with the amorphous semiconductor layer,wherein at least part of each of the pair of impurity semiconductor layers overlaps the gate electrode layer,wherein at least part of the microcrystalline semiconductor layer is provided in part of a channel, and wherein the semiconductor layer includes a plurality of crystalline regions existing in a dispersed manner in an amorphous structure.
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Accused Products
Abstract
A thin film transistor has a gate electrode; a gate insulating layer provided so as to cover the gate electrode layer; a pair of impurity semiconductor layers forming source and drain regions which is provided so that at least part of each of them overlaps the gate electrode layer and which are provided with a space therebetween; a microcrystalline semiconductor layer provided over the gate insulating layer in part of a channel length; a semiconductor layer provided over the gate insulating layer so as to cover at least the microcrystalline semiconductor layer; and an amorphous semiconductor layer provided between the semiconductor layer and the pair of impurity semiconductor layers. An impurity element which reduces the coordination number of silicon and generates dangling bonds is made to exist in the semiconductor layer.
42 Citations
28 Claims
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1. A semiconductor device comprising:
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a gate insulating layer over a gate electrode layer; a microcrystalline semiconductor layer which is on and in direct contact with the gate insulating layer and overlaps the gate electrode layer; a semiconductor layer over and in direct contact with the gate insulating layer so as to cover the microcrystalline semiconductor layer; an amorphous semiconductor layer on and in direct contact with the semiconductor layer; and a pair of impurity semiconductor layers forming a source region and a drain region, on and in direct contact with the amorphous semiconductor layer, wherein at least part of each of the pair of impurity semiconductor layers overlaps the gate electrode layer, wherein at least part of the microcrystalline semiconductor layer is provided in part of a channel, and wherein the semiconductor layer includes a plurality of crystalline regions existing in a dispersed manner in an amorphous structure. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A semiconductor device comprising:
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a gate insulating layer over a gate electrode layer; a microcrystalline semiconductor layer which is on and in direct contact with the gate insulating layer and overlaps the gate electrode layer; a semiconductor layer over and in direct contact with the gate insulating layer so as to cover the microcrystalline semiconductor layer; an amorphous semiconductor layer on and in direct contact with the semiconductor layer; and a pair of impurity semiconductor layers forming a source region and a drain region, on and in direct contact with the amorphous semiconductor layer, wherein at least part of each of the pair of impurity semiconductor layers overlaps the gate electrode layer, wherein at least part of the microcrystalline semiconductor layer is provided in part of a channel, wherein one of the pair of impurity semiconductor layers overlaps the microcrystalline semiconductor layer, and wherein the semiconductor layer includes a plurality of crystalline regions existing in a dispersed manner in an amorphous structure. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A semiconductor device comprising:
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a gate insulating layer over a gate electrode layer; microcrystalline semiconductor layers which are on and in direct contact with the gate insulating layer and overlap the gate electrode layer; a semiconductor layer over and in direct contact with the gate insulating layer so as to cover the microcrystalline semiconductor layers; an amorphous semiconductor layer on and in direct contact with the semiconductor layer; a pair of impurity semiconductor layers forming a source region and a drain region, on and in direct contact with the amorphous semiconductor layer, wherein at least part of each of the pair of impurity semiconductor layers overlaps the gate electrode layer, wherein at least parts of the microcrystalline semiconductor layers are provided in part of a channel, wherein the semiconductor layer includes a plurality of crystalline regions existing in a dispersed manner in an amorphous structure. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A semiconductor device comprising:
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a gate insulating layer over a gate electrode layer; a microcrystalline semiconductor layer which is on and in direct contact with the gate insulating layer and overlaps the gate electrode layer; a semiconductor layer over and in direct contact with the gate insulating layer so as to cover the microcrystalline semiconductor layer, an amorphous semiconductor layer on and in direct contact with the semiconductor layer; and a pair of impurity semiconductor layers forming a source region and a drain region, on and in direct contact with the amorphous semiconductor layer, wherein at least part of each of the pair of impurity semiconductor layers overlaps the gate electrode layer, wherein one of the pair of impurity semiconductor layers overlaps the microcrystalline semiconductor layer and the other impurity semiconductor layer does not overlap the microcrystalline semiconductor layer, wherein at least part of the microcrystalline semiconductor layer is provided in part of a channel, and wherein the semiconductor layer includes a plurality of crystalline regions existing in a dispersed manner in an amorphous structure. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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Specification