Oxide material and semiconductor device
First Claim
1. A semiconductor device comprising:
- a gate electrode;
a gate insulating film adjacent to the gate electrode; and
a semiconductor layer comprising an oxide material, and being adjacent to the gate insulating film, wherein the semiconductor layer is formed by sputtering while a surface on which the semiconductor layer is to be formed is heated at a temperature of 150°
C. or higher;
wherein the oxide material comprises a plurality of crystals with c-axis alignment,wherein each of the plurality of crystals comprises the atoms arranged to have a triangular or hexagonal shape in an a-b plane, andwherein one of a direction of an a-axis and a direction of a b-axis of a first crystal of the plurality of crystals is different from that of a second crystal of the plurality of crystals, in the a-b plane.
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Accused Products
Abstract
An object is to provide a material suitably used for a semiconductor included in a transistor, a diode, or the like. Another object is to provide a semiconductor device including a transistor in which the condition of an electron state at an interface between an oxide semiconductor film and a gate insulating film in contact with the oxide semiconductor film is favorable. Further, another object is to manufacture a highly reliable semiconductor device by giving stable electric characteristics to a transistor in which an oxide semiconductor film is used for a channel. A semiconductor device is formed using an oxide material which includes crystal with c-axis alignment, which has a triangular or hexagonal atomic arrangement when seen from the direction of a surface or an interface and rotates around the c-axis.
47 Citations
12 Claims
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1. A semiconductor device comprising:
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a gate electrode; a gate insulating film adjacent to the gate electrode; and a semiconductor layer comprising an oxide material, and being adjacent to the gate insulating film, wherein the semiconductor layer is formed by sputtering while a surface on which the semiconductor layer is to be formed is heated at a temperature of 150°
C. or higher;wherein the oxide material comprises a plurality of crystals with c-axis alignment, wherein each of the plurality of crystals comprises the atoms arranged to have a triangular or hexagonal shape in an a-b plane, and wherein one of a direction of an a-axis and a direction of a b-axis of a first crystal of the plurality of crystals is different from that of a second crystal of the plurality of crystals, in the a-b plane. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A semiconductor device comprising:
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a first oxide insulating film; a semiconductor layer comprising an oxide material formed over the first oxide insulating film, wherein the semiconductor layer is formed by sputtering while the first oxide insulating film is heated at a temperature of 150°
C. or higher; anda second oxide insulating film formed over the semiconductor layer, wherein the oxide material comprises a plurality of crystals with c-axis alignment, wherein each of the plurality of crystals comprises the atoms arranged to have a triangular or hexagonal shape in an a-b plane, wherein one of a direction of an a-axis and a direction of a b-axis of a first crystal of the plurality of crystals is different from that of a second crystal of the plurality of crystals, in the a-b plane. - View Dependent Claims (9, 10, 11, 12)
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Specification