Thin film transistor, method of manufacturing the same, and display device
First Claim
1. A thin film transistor comprising:
- a gate electrode;
a channel layer whose main component is oxide semiconductor;
a gate insulating film provided between the gate electrode and the channel layer;
a sealing layer provided on the side opposite to the gate electrode, of the channel layer;
a pair of electrodes formed over a portion of the sealing layer and over a portion of the gate electrode which are in contact with the channel layer and serve as a source and a drain; and
a channel protection film formed on the sealing layer such that the sealing layer is formed between the channel layer and the channel protection film,wherein the sealing layer includes at leasta first insulating film made of a first insulating material, anda second insulating film made of a second insulting material having etching selectivity to each of the oxide semiconductor and the first insulating material and provided between the first insulating film and the channel layer, andwherein the first insulating material is selected from the group consisting of Al2O3, Ga2O3 and ZrO2 and the second insulating material is at least one of SiOX, SiNX, Y2O3, TaO, HfO and oxynitrides thereof,wherein the first insulating layer and the second insulating layer are etched during a single photolithographic process, andwherein the channel protection film is formed on the sealing layer only in areas corresponding to the gate electrode.
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Accused Products
Abstract
The present application provides a thin film transistor and a method of manufacturing same capable of suppressing diffusion of aluminum to oxide semiconductor and selectively etching oxide semiconductor and aluminum oxide. The thin film transistor includes: a gate electrode; a channel layer whose main component is oxide semiconductor; a gate insulating film provided between the gate electrode and the channel layer; a sealing layer provided on the side opposite to the gate electrode, of the channel layer; and a pair of electrodes which are in contact with the channel layer and serve as a source and a drain. The sealing layer includes at least a first insulating film made of a first insulating material, and a second insulating film made of a second insulting material having etching selectivity to each of the oxide semiconductor and the first insulating material and provided between the first insulating film and the channel layer.
35 Citations
32 Claims
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1. A thin film transistor comprising:
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a gate electrode; a channel layer whose main component is oxide semiconductor; a gate insulating film provided between the gate electrode and the channel layer; a sealing layer provided on the side opposite to the gate electrode, of the channel layer; a pair of electrodes formed over a portion of the sealing layer and over a portion of the gate electrode which are in contact with the channel layer and serve as a source and a drain; and a channel protection film formed on the sealing layer such that the sealing layer is formed between the channel layer and the channel protection film, wherein the sealing layer includes at least a first insulating film made of a first insulating material, and a second insulating film made of a second insulting material having etching selectivity to each of the oxide semiconductor and the first insulating material and provided between the first insulating film and the channel layer, and wherein the first insulating material is selected from the group consisting of Al2O3, Ga2O3 and ZrO2 and the second insulating material is at least one of SiOX, SiNX, Y2O3, TaO, HfO and oxynitrides thereof, wherein the first insulating layer and the second insulating layer are etched during a single photolithographic process, and wherein the channel protection film is formed on the sealing layer only in areas corresponding to the gate electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A display device comprising a thin film transistor and a display element, wherein the thin film transistor includes:
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a gate electrode; a channel layer whose main component is oxide semiconductor; a gate insulating film provided between the gate electrode and the channel layer; a sealing layer provided on the side opposite to the gate electrode, of the channel layer; a pair of electrodes formed over a portion of the sealing layer and over a portion of the gate electrode which are in contact with the channel layer and serve as a source and a drain; and a channel protection film formed on the sealing layer such that the sealing layer is formed between the channel layer and the channel protection film, and the sealing layer includes at least a first insulating film made of a first insulating material; and a second insulating film made of a second insulting material having etching selectivity to each of the oxide semiconductor and the first insulating material and provided between the first insulating film and the channel layer, wherein the first insulating material is selected from the group consisting of Al2O3, Ga2O3 and ZrO2 and the second insulating material is at least one of SiOX, SiNX, Y2O3, TaO, HfO and oxynitrides thereof, wherein the first insulating layer and the second insulating layer are etched during a single photolithographic process, and wherein the channel protection film is formed on the sealing layer only in areas corresponding to the gate electrode. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification