Thin film transistor and display device
First Claim
1. A thin film transistor comprising;
- a gate electrode,an oxide semiconductor layer, anda gate insulator film,wherein;
the oxide semiconductor layer is configured as a channel layer, and the oxide semiconductor layer comprises at least one metal selected from the group consisting of In, Ga, Zn, and Sn, with the proviso that an oxide semiconductor consisting of Sn and at least one of In and Zn is excluded,the gate insulator film is interposed between the gate electrode and the channel layer,the gate insulator film is a laminate structure comprising a first layer, which is in direct contact with the oxide semiconductor layer, and one or more other layers,the first layer of the gate insulator film has a hydrogen concentration of 4 atomic % or lower, andthe one or more other layers of the gate insulator film have a hydrogen concentration higher than the first layer.
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Accused Products
Abstract
Provided is a thin film transistor comprising an oxide semiconductor thin film layer and has a threshold voltage that does not change much due to light, a bias stress or the like, thereby exhibiting excellent stress stability. A thin film transistor of the present invention is provided with: a gate electrode; an oxide semiconductor layer that is used as a channel layer; and a gate insulator film that is arranged between the gate electrode and the channel layer. The oxide semiconductor layer is configured of at least one metal element that is selected from the group consisting of In, Ga, Zn and Sn (excluding the cases where the oxide semiconductor layer is constituted of metal elements Sn, and at least one of In and Zn). The hydrogen concentration in the gate insulator film, which is in direct contact with the oxide semiconductor layer, is controlled to 4 atomic % or less.
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Citations
14 Claims
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1. A thin film transistor comprising;
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a gate electrode, an oxide semiconductor layer, and a gate insulator film, wherein; the oxide semiconductor layer is configured as a channel layer, and the oxide semiconductor layer comprises at least one metal selected from the group consisting of In, Ga, Zn, and Sn, with the proviso that an oxide semiconductor consisting of Sn and at least one of In and Zn is excluded, the gate insulator film is interposed between the gate electrode and the channel layer, the gate insulator film is a laminate structure comprising a first layer, which is in direct contact with the oxide semiconductor layer, and one or more other layers, the first layer of the gate insulator film has a hydrogen concentration of 4 atomic % or lower, and the one or more other layers of the gate insulator film have a hydrogen concentration higher than the first layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification