Semiconductor device and manufacturing method thereof
First Claim
1. A semiconductor device comprising:
- a first gate electrode;
an oxide semiconductor layer over the first gate electrode, the oxide semiconductor layer including a crystal region in which c-axis is aligned in a direction, wherein an angle between the direction and a surface of the oxide semiconductor layer is within a range of 80°
to 100°
;
a second gate electrode over the oxide semiconductor layer;
a nitride insulating layer containing hydrogen over the oxide semiconductor layer.
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Abstract
One embodiment of the present invention is to achieve high mobility in a device using an oxide semiconductor and provide a highly reliable display device. An oxide semiconductor layer including a crystal region in which c-axis is aligned in a direction substantially perpendicular to a surface is formed and an oxide insulating layer is formed over and in contact with the oxide semiconductor layer. Oxygen is supplied to the oxide semiconductor layer by third heat treatment. A nitride insulating layer containing hydrogen is formed over the oxide insulating layer and fourth heat treatment is performed, so that hydrogen is supplied at least to an interface between the oxide semiconductor layer and the oxide insulating layer.
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Citations
28 Claims
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1. A semiconductor device comprising:
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a first gate electrode; an oxide semiconductor layer over the first gate electrode, the oxide semiconductor layer including a crystal region in which c-axis is aligned in a direction, wherein an angle between the direction and a surface of the oxide semiconductor layer is within a range of 80°
to 100°
;a second gate electrode over the oxide semiconductor layer; a nitride insulating layer containing hydrogen over the oxide semiconductor layer. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A semiconductor device comprising:
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a first gate electrode; an oxide semiconductor layer over the first gate electrode, the oxide semiconductor layer including a crystal region in which c-axis is aligned in a direction, wherein an angle between the direction and a surface of the oxide semiconductor layer is within a range of 80°
to 100°
;an oxide insulating layer over the oxide semiconductor layer; a second gate electrode over the oxide semiconductor layer; a nitride insulating layer containing hydrogen over the oxide insulating layer. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A semiconductor device comprising:
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a first conductive layer; an oxide semiconductor layer over the first conductive layer, the oxide semiconductor layer including a crystal region in which c-axis is aligned in a direction, wherein an angle between the direction and a surface of the oxide semiconductor layer is within a range of 80°
to 100°
;a source electrode electrically connected to the oxide semiconductor layer; a drain electrode electrically connected to the oxide semiconductor layer; a second conductive layer over the oxide semiconductor layer; a nitride insulating layer containing hydrogen over the oxide semiconductor layer. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A semiconductor device comprising:
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a first conductive layer; an oxide semiconductor layer over the first conductive layer, the oxide semiconductor layer including a crystal region in which c-axis is aligned in a direction substantially perpendicular to a surface of the oxide semiconductor layer; a source electrode electrically connected to the oxide semiconductor layer; a drain electrode electrically connected to the oxide semiconductor layer; a second conductive layer over the oxide semiconductor layer; a nitride insulating layer containing hydrogen over the oxide semiconductor layer, wherein the oxide semiconductor layer comprises an oxide comprising indium. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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Specification