SEMICONDUCTOR DEVICE AND MANUFACTURING METHOD THEREOF
First Claim
1. A semiconductor device comprising:
- a gate electrode layer;
a gate insulating layer over the gate electrode layer;
a first oxide semiconductor layer over the gate insulating layer;
a source electrode layer and a drain electrode layer over the first oxide semiconductor layer; and
a second oxide semiconductor layer over the source electrode layer, the drain electrode layer and the first oxide semiconductor layer,wherein the first oxide semiconductor layer and the second oxide semiconductor layer comprise insulating oxide comprising Zn, andwherein the second oxide semiconductor layer is in contact with the first oxide semiconductor layer at a portion between the source electrode layer and the drain electrode layer.
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Accused Products
Abstract
An object is to provide a transistor including an oxide layer which includes Zn and does not include a rare metal such as In or Ga. Another object is to reduce an off current and stabilize electric characteristics in the transistor including an oxide layer which includes Zn. A transistor including an oxide layer including Zn is formed by stacking an oxide semiconductor layer including insulating oxide over an oxide layer so that the oxide layer is in contact with a source electrode layer or a drain electrode layer with the oxide semiconductor layer including insulating oxide interposed therebetween, whereby variation in the threshold voltage of the transistor can be reduced and electric characteristics can be stabilized.
13 Citations
18 Claims
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1. A semiconductor device comprising:
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a gate electrode layer; a gate insulating layer over the gate electrode layer; a first oxide semiconductor layer over the gate insulating layer; a source electrode layer and a drain electrode layer over the first oxide semiconductor layer; and a second oxide semiconductor layer over the source electrode layer, the drain electrode layer and the first oxide semiconductor layer, wherein the first oxide semiconductor layer and the second oxide semiconductor layer comprise insulating oxide comprising Zn, and wherein the second oxide semiconductor layer is in contact with the first oxide semiconductor layer at a portion between the source electrode layer and the drain electrode layer. - View Dependent Claims (2, 3, 4)
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5. A semiconductor device comprising:
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a gate electrode layer; a gate insulating layer over the gate electrode layer; a first oxide semiconductor layer over the gate insulating layer; a source electrode layer and a drain electrode layer over the first oxide semiconductor layer; a second oxide semiconductor layer over the source electrode layer, the drain electrode layer and the first oxide semiconductor layer; a pixel electrode in electrical contact with one of the source electrode layer and the drain electrode layer; and a light emitting layer over the pixel electrode, wherein the first oxide semiconductor layer and the second oxide semiconductor layer comprise insulating oxide comprising Zn, and wherein the second oxide semiconductor layer is in contact with the first oxide semiconductor layer at a portion between the source electrode layer and the drain electrode layer. - View Dependent Claims (6, 7, 8)
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9. A semiconductor device comprising:
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a gate electrode layer; a gate insulating layer over the gate electrode layer; a first oxide semiconductor layer over the gate insulating layer; a first n-type buffer layer and a second n-type buffer layer over the first oxide semiconductor layer; a source electrode layer over the first n-type buffer layer, and a drain electrode layer over the second n-type buffer layer; and a second oxide semiconductor layer over the source electrode layer, the drain electrode layer and the first oxide semiconductor layer, wherein the first oxide semiconductor layer and the second oxide semiconductor layer comprise insulating oxide comprising Zn, and wherein the second oxide semiconductor layer is in contact with the first oxide semiconductor layer at a portion between the source electrode layer and the drain electrode layer. - View Dependent Claims (10, 11, 12, 13)
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14. A semiconductor device comprising:
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a gate electrode layer; a gate insulating layer over the gate electrode layer; a first oxide semiconductor layer over the gate insulating layer; a first n-type buffer layer and a second n-type buffer layer over the first oxide semiconductor layer; a source electrode layer over the first n-type buffer layer, and a drain electrode layer over the second n-type buffer layer; a second oxide semiconductor layer over the source electrode layer, the drain electrode layer and the first oxide semiconductor layer; a pixel electrode in electrical contact with one of the source electrode layer and the drain electrode layer; and a light emitting layer over the pixel electrode, wherein the first oxide semiconductor layer and the second oxide semiconductor layer comprise insulating oxide comprising Zn, and wherein the second oxide semiconductor layer is in contact with the first oxide semiconductor layer at a portion between the source electrode layer and the drain electrode layer. - View Dependent Claims (15, 16, 17, 18)
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Specification