SEMICONDUCTOR DEVICE AND MANUFACTURING METHOD THEREOF
First Claim
1. A semiconductor device comprising:
- an oxide semiconductor layer including indium, gallium, and zinc;
a first conductive layer including aluminum;
a second conductive layer including a high-melting-point metal material over the first conductive layer; and
a barrier layer including aluminum oxide,wherein the barrier layer is formed in an edge portion of the first conductive layer, andwherein the oxide semiconductor layer is provided in contact with the second conductive layer and the barrier layer.
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Accused Products
Abstract
Electric characteristics and reliability of a thin film transistor are impaired by diffusion of an impurity element into a channel region. The present invention provides a thin film transistor in which aluminum atoms are unlikely to be diffused to an oxide semiconductor layer. A thin film transistor including an oxide semiconductor layer including indium, gallium, and zinc includes source or drain electrode layers in which first conductive layers including aluminum as a main component and second conductive layers including a high-melting-point metal material are stacked. An oxide semiconductor layer 113 is in contact with the second conductive layers and barrier layers including aluminum oxide as a main component, whereby diffusion of aluminum atoms to the oxide semiconductor layer is suppressed.
184 Citations
16 Claims
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1. A semiconductor device comprising:
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an oxide semiconductor layer including indium, gallium, and zinc; a first conductive layer including aluminum; a second conductive layer including a high-melting-point metal material over the first conductive layer; and a barrier layer including aluminum oxide, wherein the barrier layer is formed in an edge portion of the first conductive layer, and wherein the oxide semiconductor layer is provided in contact with the second conductive layer and the barrier layer. - View Dependent Claims (2, 3, 4)
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5. A semiconductor device comprising:
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a gate insulating layer; a gate electrode layer provided on one side of the gate insulating layer; an oxide semiconductor layer provided on the other side of the gate insulating layer; and a source electrode layer and a drain electrode layer, each comprising a first conductive layer including aluminum in contact with the gate insulating layer, a second conductive layer including a high-melting-point metal material over the first conductive layer, and a barrier layer a barrier layer including aluminum oxide at an edge portion of the first conductive layer, wherein the oxide semiconductor layer is in contact with the second conductive layer and the barrier layer. - View Dependent Claims (6, 7, 8)
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9. A semiconductor device comprising:
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a source electrode layer and a drain electrode layer, each comprising a first conductive layer including aluminum, a second conductive layer including a high-melting-point metal material over the first conductive layer, and a barrier layer a barrier layer including aluminum oxide at an edge portion of the first conductive layer; an oxide semiconductor layer covering end portions of the source electrode layer and the drain electrode layer; a gate insulating layer covering the oxide semiconductor layer; and a gate electrode layer overlapping the end portions of the source electrode layer and the drain electrode layer with the oxide semiconductor layer and the gate insulating layer interposed therebetween, wherein the oxide semiconductor layer is in contact with the second conductive layer and the barrier layer. - View Dependent Claims (10, 11, 12)
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13. A manufacturing method of a thin film transistor, comprising:
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forming a source electrode layer and a drain electrode layer, each comprising a first conductive layer including aluminum, and a second conductive layer including a high-melting-point metal material over the first conductive layer; forming a barrier layer including aluminum oxide by performing an oxidation treatment on an exposed edge portion of the first conductive layer; and stacking an oxide semiconductor layer including indium, gallium, and zinc so that the oxide semiconductor layer is in contact with the second conductive layer and the barrier layer. - View Dependent Claims (14, 15, 16)
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Specification