Method for manufacturing semiconductor device
First Claim
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1. A method for manufacturing a semiconductor device comprising the steps of:
- forming a first insulating layer;
forming a first oxide semiconductor layer over the first insulating layer;
forming a second oxide semiconductor layer over the first oxide semiconductor layer;
forming a source electrode layer and a drain electrode layer on and in contact with the second oxide semiconductor layer; and
forming a third oxide semiconductor layer on and in contact with the second oxide semiconductor layer, the source electrode layer, and the drain electrode layer,wherein at least one of the first, second, and third oxide semiconductor layers comprises a single crystal region having a crystal structure, andwherein the crystal structure of the single crystal region has bonds for forming a hexagonal lattice in an a-b plane of the crystal structure and includes a c-axis perpendicular to a surface of the first insulating layer.
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Abstract
A highly reliable semiconductor device including an oxide semiconductor film with high crystallinity is provided. A first oxide semiconductor film and a second oxide semiconductor film are stacked over an insulating layer. After forming source and drain electrode layers on the second oxide semiconductor film, a third oxide semiconductor film is provided in contact with the second oxide semiconductor film and top surfaces and the source and drain electrode layers. At least one of the first, second, and third oxide semiconductor films is an oxide semiconductor film having a single crystal region.
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Citations
11 Claims
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1. A method for manufacturing a semiconductor device comprising the steps of:
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forming a first insulating layer; forming a first oxide semiconductor layer over the first insulating layer; forming a second oxide semiconductor layer over the first oxide semiconductor layer; forming a source electrode layer and a drain electrode layer on and in contact with the second oxide semiconductor layer; and forming a third oxide semiconductor layer on and in contact with the second oxide semiconductor layer, the source electrode layer, and the drain electrode layer, wherein at least one of the first, second, and third oxide semiconductor layers comprises a single crystal region having a crystal structure, and wherein the crystal structure of the single crystal region has bonds for forming a hexagonal lattice in an a-b plane of the crystal structure and includes a c-axis perpendicular to a surface of the first insulating layer. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for manufacturing a semiconductor device comprising the steps of:
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forming a first insulating layer; forming a first oxide semiconductor layer over the first insulating layer; forming a second oxide semiconductor layer over the first oxide semiconductor layer; forming a source electrode layer and a drain electrode layer on and in contact with the second oxide semiconductor layer; forming a third oxide semiconductor layer on and in contact with upper surfaces of the second oxide semiconductor layer, the source electrode layer, and the drain electrode layer, wherein the third oxide semiconductor layer covers side surfaces of the source electrode layer and the drain electrode layer; forming a second insulating layer over the source electrode layer, the drain electrode layer, and the third oxide semiconductor layer, wherein at least one of the first, second, and third oxide semiconductor layers comprises a single crystal region having a crystal structure, and wherein the crystal structure of the single crystal region has bonds for forming a hexagonal lattice in an a-b plane and includes a c-axis perpendicular to a surface of the first insulating layer. - View Dependent Claims (8, 9, 10, 11)
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Specification