TRANSISTOR AND DISPLAY DEVICE
First Claim
1. A transistor comprising:
- a gate electrode layer;
a gate insulating layer adjacent to the gate electrode layer;
an oxide semiconductor layer adjacent to the gate electrode layer with the gate insulating layer therebetween, the oxide semiconductor layer including a channel region; and
an oxide insulating layer in contact with the oxide semiconductor layer, wherein the oxide semiconductor layer is located between the gate insulating layer and the oxide insulating layer,wherein the oxide semiconductor layer includes a first metal, a second metal, and a third metal,wherein the first metal is indium, the second metal is zinc, and the third metal is a different metal from indium and zinc, andwherein at least part of the channel region includes crystals which are c-axis-oriented in a direction perpendicular to a surface of the oxide semiconductor layer.
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Accused Products
Abstract
To provide a transistor having a favorable electric characteristics and high reliability and a display device including the transistor. The transistor is a bottom-gate transistor formed using an oxide semiconductor for a channel region. An oxide semiconductor layer subjected to dehydration or dehydrogenation through heat treatment is used as an active layer. The active layer includes a first region of a superficial portion microcrystallized and a second region of the rest portion. By using the oxide semiconductor layer having such a structure, a change to an n-type, which is attributed to entry of moisture to the superficial portion or elimination of oxygen from the superficial portion, and generation of a parasitic channel can be suppressed. In addition, contact resistance between the oxide semiconductor layer and source and drain electrodes can be reduced.
114 Citations
32 Claims
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1. A transistor comprising:
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a gate electrode layer; a gate insulating layer adjacent to the gate electrode layer; an oxide semiconductor layer adjacent to the gate electrode layer with the gate insulating layer therebetween, the oxide semiconductor layer including a channel region; and an oxide insulating layer in contact with the oxide semiconductor layer, wherein the oxide semiconductor layer is located between the gate insulating layer and the oxide insulating layer, wherein the oxide semiconductor layer includes a first metal, a second metal, and a third metal, wherein the first metal is indium, the second metal is zinc, and the third metal is a different metal from indium and zinc, and wherein at least part of the channel region includes crystals which are c-axis-oriented in a direction perpendicular to a surface of the oxide semiconductor layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A transistor comprising:
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a gate electrode layer; a gate insulating layer over the gate electrode layer; an oxide semiconductor layer over the gate electrode layer with the gate insulating layer therebetween, the oxide semiconductor layer including a channel region; a source electrode over the oxide semiconductor layer; a drain electrode over the oxide semiconductor layer; an oxide insulating layer in contact with the oxide semiconductor layer, wherein the oxide semiconductor layer is located between the gate insulating layer and the oxide insulating layer, wherein the oxide semiconductor layer includes a first metal, a second metal, and a third metal, wherein the first metal is indium, the second metal is zinc, and the third metal is a different metal from indium and zinc, and wherein at least part of the channel region includes crystals which are c-axis-oriented in a direction perpendicular to a surface of the oxide semiconductor layer. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A transistor comprising:
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a gate electrode layer; a gate insulating layer over the gate electrode layer; an oxide semiconductor layer over the gate electrode layer with the gate insulating layer therebetween, the oxide semiconductor layer including a channel region; a source electrode over the oxide semiconductor layer; a drain electrode over the oxide semiconductor layer; an oxide insulating layer in contact with the oxide semiconductor layer, wherein the oxide semiconductor layer is located between the gate insulating layer and the oxide insulating layer, wherein the oxide semiconductor layer includes a first metal, a second metal, and a third metal, wherein the first metal is indium, the second metal is zinc, and the third metal is a different metal from indium and zinc, and wherein at least part of the channel region includes crystals which are c-axis-oriented in a direction perpendicular to a surface of the oxide semiconductor layer, wherein an entirety of the oxide semiconductor layer overlaps with the gate electrode layer. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification