Semiconductor device having an oxide semiconductor and a metal oxide film
First Claim
1. A semiconductor device comprising:
- a first gate electrode;
a gate insulating film over the first gate electrode;
a metal oxide film over the gate insulating film;
an oxide semiconductor film over and in contact with the metal oxide film;
a source electrode and a drain electrode over the oxide semiconductor film;
an insulating film over and in direct contact with the oxide semiconductor film, the metal oxide film, the source electrode, and the drain electrode; and
a second gate electrode over the insulating film,wherein the metal oxide film is thicker than the oxide semiconductor film.
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Accused Products
Abstract
As a transistor including an oxide semiconductor film, a transistor in which a metal oxide film containing a constituent similar to that of an oxide semiconductor film is provided between the oxide semiconductor film and a gate insulating film and a gate insulating film containing a constituent different from that of the metal oxide film and that of the oxide semiconductor film is provided to be in contact with the metal oxide film is provided. The oxide semiconductor film used for an active layer of the transistor is a highly purified and electrically i-type (intrinsic) film which is formed by heat treatment through which an impurity such as hydrogen, moisture, a hydroxyl group or a hydride is removed and oxygen which is a main component of the oxide semiconductor and reduced together with the impurity removal step is supplied.
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Citations
17 Claims
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1. A semiconductor device comprising:
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a first gate electrode; a gate insulating film over the first gate electrode; a metal oxide film over the gate insulating film; an oxide semiconductor film over and in contact with the metal oxide film; a source electrode and a drain electrode over the oxide semiconductor film; an insulating film over and in direct contact with the oxide semiconductor film, the metal oxide film, the source electrode, and the drain electrode; and a second gate electrode over the insulating film, wherein the metal oxide film is thicker than the oxide semiconductor film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A semiconductor device comprising:
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a first gate electrode; a gate insulating film over the first gate electrode; a metal oxide film over the gate insulating film; an oxide semiconductor film in contact with the metal oxide film; a source electrode and a drain electrode over the oxide semiconductor film; an insulating film over and in direct contact with the oxide semiconductor film, the metal oxide film, the source electrode, and the drain electrode; and a second gate electrode over the insulating film, wherein the metal oxide film is thicker than the oxide semiconductor film. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification