OXIDE SEMICONDUCTOR DEVICE AND METHOD OF MANUFACTURING THE SAME
First Claim
1. A field-effect transistor comprising:
- a gate electrode;
a first semiconducting layer provided on the gate electrode interposing a gate insulating film;
a second semiconducting layer connected to the first semiconducting layer;
a source electrode connected to the second semiconducting layer; and
a drain electrode connected to the second semiconducting layer,wherein the first semiconducting layer contains In (indium) element and O (oxide) element, andthe second semiconducting layer contains Zn (zinc) element and O element and does not contain In element.
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Accused Products
Abstract
Features are forming a gate electrode on an insulating substrate; forming a first semiconducting layer mainly composed of an indium oxide and having a film thickness of 5 nm or more onto the gate electrode interposing a gate insulating film; forming a second semiconducting layer mainly composed of zinc and tin oxides without containing indium and having a film thickness of 5 to 50 nm on the first semiconducting layer, and including a step of forming a source electrode and a drain electrode on the second semiconducting layer. In this manner, by combining the materials of the first semiconducting layer and the second semiconducting layer with each other, a semiconductor device with a reduced dependency on the film thickness of the semiconducting layer, little characteristic variations on a large area substrate is provided.
37 Citations
15 Claims
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1. A field-effect transistor comprising:
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a gate electrode; a first semiconducting layer provided on the gate electrode interposing a gate insulating film; a second semiconducting layer connected to the first semiconducting layer; a source electrode connected to the second semiconducting layer; and a drain electrode connected to the second semiconducting layer, wherein the first semiconducting layer contains In (indium) element and O (oxide) element, and the second semiconducting layer contains Zn (zinc) element and O element and does not contain In element. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of manufacturing a field-effect transistor comprising:
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a first step of forming a first semiconducting layer containing In (indium) element and O (oxide) element on a gate insulating film; and a second step of forming a second semiconducting layer containing Zn (zinc) element and O element and not containing In element on the first semiconducting film. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification