OXIDE SEMICONDUCTOR DEVICE AND SURFACE TREATMENT METHOD OF OXIDE SEMICONDUCTOR
First Claim
1. An oxide semiconductor device comprising:
- a substrate;
a channel layer disposed above the substrate and made up of a zinc-containing semiconductor;
a source-drain electrode layer disposed in contact with both end portions of the channel layer so as to sandwich the channel layer;
a gate insulator disposed in contact with one surface of the channel layer; and
a gate electrode disposed on the gate insulator, the gate electrode giving an electric field to the channel layer by way of the gate insulator;
wherein a surface treatment layer containing at least one of sulfur and selenium is provided at a boundary where the gate insulator and the channel layer are in contact with each other.
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Accused Products
Abstract
Oxygen defects formed at the boundary between the zinc oxide type oxide semiconductor and the gate insulator are terminated by a surface treatment using sulfur or selenium as an oxygen group element or a compound thereof, the oxygen group element scarcely occurring physical property value change. Sulfur or selenium atoms effectively substitute oxygen defects to prevent occurrence of electron supplemental sites by merely applying a gas phase or liquid phase treatment to an oxide semiconductor or gate insulator with no remarkable change on the manufacturing process. As a result, this can attain the suppression of the threshold potential shift and the leak current in the characteristics of a thin film transistor.
363 Citations
11 Claims
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1. An oxide semiconductor device comprising:
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a substrate; a channel layer disposed above the substrate and made up of a zinc-containing semiconductor; a source-drain electrode layer disposed in contact with both end portions of the channel layer so as to sandwich the channel layer; a gate insulator disposed in contact with one surface of the channel layer; and a gate electrode disposed on the gate insulator, the gate electrode giving an electric field to the channel layer by way of the gate insulator; wherein a surface treatment layer containing at least one of sulfur and selenium is provided at a boundary where the gate insulator and the channel layer are in contact with each other. - View Dependent Claims (2, 3, 4, 5)
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6. A method of manufacturing an oxide semiconductor device, comprising the steps of:
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providing a substrate; forming a gate electrode having a desired shape above the substrate; depositing a gate insulator so as to cover the surface of the gate electrode and the substrate; depositing a source-drain electrode layer comprising a conductor over the gate insulator; pattering the deposited source-drain electrode layer thereby forming an opening above the gate electrode; introducing at least one of sulfur or selenium through the opening to the surface of the gate insulator thereby forming a surface treatment layer; and depositing a zinc-containing oxide semiconductor so as to at least cover the surface of the surface treatment layer thereby forming a channel layer. - View Dependent Claims (7, 8)
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9. A method of manufacturing an oxide semiconductor device, comprising the steps of:
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providing a substrate; forming a source-drain electrode layer having a desired shape above the substrate; depositing a zinc-containing oxide semiconductor so as to cover the surface of the source-drain electrode layer and the substrate; introducing at least one of sulfur and selenium to the surface of the oxide semiconductor thereby forming a surface treatment layer; depositing a gate insulator above the oxide semiconductor having the surface treatment layer; and depositing a gate electrode film on the gate insulator and pattering the gate electrode film thereby forming a gate electrode. - View Dependent Claims (10, 11)
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Specification