Oxide semiconductor film and semiconductor device
First Claim
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1. A semiconductor device comprising:
- a first metal oxide film;
an oxide semiconductor film over the first metal oxide film;
a second metal oxide film over the oxide semiconductor film;
a gate insulating film over the second metal oxide film; and
a gate electrode over the gate insulating film,wherein the oxide semiconductor film comprises an In—
Ga—
Zn—
O-based metal oxide,wherein the second metal oxide film comprises a Ga—
Zn—
O-based metal oxide, andwherein an amount of substance of zinc oxide with respect to gallium oxide is lower than 50% in the Ga—
Zn—
O-based metal oxide.
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Abstract
A semiconductor device comprising a first metal oxide film, an oxide semiconductor film, a second metal oxide film, a gate insulating film, and a gate electrode is provided. The oxide semiconductor film comprises an In—Ga—Zn—O-based metal oxide. The second metal oxide film comprises a Ga—Zn—O-based metal oxide. An amount of substance of zinc oxide with respect to gallium oxide is lower than 50% in the Ga—Zn—O-based metal oxide.
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Citations
16 Claims
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1. A semiconductor device comprising:
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a first metal oxide film; an oxide semiconductor film over the first metal oxide film; a second metal oxide film over the oxide semiconductor film; a gate insulating film over the second metal oxide film; and a gate electrode over the gate insulating film, wherein the oxide semiconductor film comprises an In—
Ga—
Zn—
O-based metal oxide,wherein the second metal oxide film comprises a Ga—
Zn—
O-based metal oxide, andwherein an amount of substance of zinc oxide with respect to gallium oxide is lower than 50% in the Ga—
Zn—
O-based metal oxide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A semiconductor device comprising:
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a first metal oxide film; an oxide semiconductor film over the first metal oxide film; a second metal oxide film over the oxide semiconductor film; a gate insulating film over the second metal oxide film; and a gate electrode over the gate insulating film, wherein the oxide semiconductor film comprises an In—
Ga—
Zn—
O-based metal oxide,wherein the second metal oxide film comprises a Ga—
Zn—
O-based metal oxide, andwherein an amount of substance of zinc oxide with respect to gallium oxide is lower than 25% in the Ga—
Zn—
O-based metal oxide. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification