Semiconductor device and method of manufacturing the same
First Claim
1. A semiconductor device comprising:
- a first insulating layer over and in contact with a substrate;
an oxide semiconductor layer over and in contact with the first insulating layer;
a gate electrode overlapping with the oxide semiconductor layer; and
a second insulating layer between the oxide semiconductor layer and the gate electrode,wherein a hydrogen concentration at an interface between the substrate and the first insulating layer is less than or equal to 1.1×
1020 atoms/cm3.
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Accused Products
Abstract
It is an object to manufacture a semiconductor device in which a transistor including an oxide semiconductor has normally-off characteristics, small fluctuation in electric characteristics, and high reliability. First, first heat treatment is performed on a substrate, a base insulating layer is formed over the substrate, an oxide semiconductor layer is formed over the base insulating layer, and the step of performing the first heat treatment to the step of forming the oxide semiconductor layer are performed without exposure to the air. Next, after the oxide semiconductor layer is formed, second heat treatment is performed. An insulating layer from which oxygen is released by heating is used as the base insulating layer.
117 Citations
15 Claims
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1. A semiconductor device comprising:
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a first insulating layer over and in contact with a substrate; an oxide semiconductor layer over and in contact with the first insulating layer; a gate electrode overlapping with the oxide semiconductor layer; and a second insulating layer between the oxide semiconductor layer and the gate electrode, wherein a hydrogen concentration at an interface between the substrate and the first insulating layer is less than or equal to 1.1×
1020 atoms/cm3. - View Dependent Claims (2, 3, 4)
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5. A method for manufacturing a semiconductor device comprising the steps of:
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reducing hydrogen adsorbed on a surface of a substrate by performing first heat treatment on the surface of the substrate; forming an insulating layer over the substrate after the step of performing the first heat treatment; and forming an oxide semiconductor layer over the insulating layer, wherein a series of steps from performing the first heat treatment to forming the oxide semiconductor layer is performed without exposure to air, and wherein a hydrogen concentration at an interface between the substrate and the insulating layer is less than or equal to 1.1×
1020 atoms/cm3 after the series of steps. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A semiconductor device comprising:
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a first insulating layer over and in contact with a substrate; an oxide semiconductor layer over and in contact with the first insulating layer; a second insulating layer over the oxide semiconductor layer; and a gate electrode over the second insulating layer, wherein a hydrogen concentration at an interface between the substrate and the first insulating layer is less than or equal to 1.1×
1020 atoms/cm3. - View Dependent Claims (13, 14, 15)
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Specification