Metal oxide semiconductor device
First Claim
1. A semiconductor device comprising:
- a first silicon oxide film;
a first oxide semiconductor film over the first silicon oxide film, the first oxide semiconductor film comprising a first metal element; and
a second oxide semiconductor film over the first oxide semiconductor film, the second oxide semiconductor film comprising the first metal element,wherein the second oxide semiconductor film further comprises carbon or silicon as an impurity, andwherein an electron diffraction pattern by electron diffraction with a beam diameter of 1 nmφ
of the second oxide semiconductor film has a plurality of circumferentially arranged spots.
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Accused Products
Abstract
A highly reliable semiconductor device including an oxide semiconductor is provided. Provided is a semiconductor device including an oxide semiconductor layer, an insulating layer in contact with the oxide semiconductor layer, a gate electrode layer overlapping with the oxide semiconductor layer, and a source electrode layer and a drain electrode layer electrically connected to the oxide semiconductor layer. The oxide semiconductor layer includes a first region having a crystal whose size is less than or equal to 10 nm and a second region which overlaps with the insulating layer with the first region provided therebetween and which includes a crystal part whose c-axis is aligned in a direction parallel to a normal vector of the surface of the oxide semiconductor layer.
189 Citations
21 Claims
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1. A semiconductor device comprising:
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a first silicon oxide film; a first oxide semiconductor film over the first silicon oxide film, the first oxide semiconductor film comprising a first metal element; and a second oxide semiconductor film over the first oxide semiconductor film, the second oxide semiconductor film comprising the first metal element, wherein the second oxide semiconductor film further comprises carbon or silicon as an impurity, and wherein an electron diffraction pattern by electron diffraction with a beam diameter of 1 nmφ
of the second oxide semiconductor film has a plurality of circumferentially arranged spots. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A semiconductor device comprising:
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a first silicon oxide film; a first oxide semiconductor film over the first silicon oxide film, the first oxide semiconductor film comprising a first metal element; and a second oxide semiconductor film over the first oxide semiconductor film, the second oxide semiconductor film comprising the first metal element, wherein the second oxide semiconductor film further comprises carbon or silicon as an impurity, wherein concentration of carbon or silicon is lower than or equal to 3×
1018/cm3, andwherein an electron diffraction pattern by electron diffraction with a beam diameter of 1 nmφ
of the second oxide semiconductor film has a plurality of circumferentially arranged spots. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A semiconductor device comprising:
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a first silicon oxide film; a first oxide semiconductor film over the first silicon oxide film, the first oxide semiconductor film comprising a first metal element; and a second oxide semiconductor film over the first oxide semiconductor film, the second oxide semiconductor film comprising the first metal element, wherein an electron diffraction pattern by electron diffraction with a beam diameter of 1 nmφ
of the second oxide semiconductor film has a plurality of circumferentially arranged spots.
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Specification