Method for manufacturing semiconductor device
First Claim
1. A semiconductor device comprising:
- a substrate; and
a transistor over the substrate, the transistor comprising;
a gate electrode;
an oxide semiconductor layer including a channel; and
a gate insulating film interposed between the gate electrode and the oxide semiconductor layer,wherein the oxide semiconductor layer includes;
a first oxide semiconductor layer including a first crystalline region;
a second oxide semiconductor layer including a second crystalline region, the second oxide semiconductor layer being over the first oxide semiconductor layer; and
a third oxide semiconductor layer including a third crystalline region, the third oxide semiconductor layer being over the second oxide semiconductor layer,wherein the second crystalline region includes a first crystal,wherein the third crystalline region includes a second crystal, andwherein each of a c-axis of the first crystal and a c-axis of the second crystal is aligned substantially perpendicular to a surface of the substrate.
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Abstract
A larger substrate can be used, and a transistor having a desirably high field-effect mobility can be manufactured through formation of an oxide semiconductor layer having a high degree of crystallinity, whereby a large-sized display device, a high-performance semiconductor device, or the like can be put into practical use. A first multi-component oxide semiconductor layer is formed over a substrate and a single-component oxide semiconductor layer is formed thereover; then, crystal growth is carried out from a surface to an inside by performing heat treatment at 500° C. to 1000° C. inclusive, preferably 550° C. to 750° C. inclusive so that a first multi-component oxide semiconductor layer including single crystal regions and a single-component oxide semiconductor layer including single crystal regions are formed; and a second multi-component oxide semiconductor layer including single crystal regions is stacked over the single-component oxide semiconductor layer including single crystal regions.
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Citations
40 Claims
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1. A semiconductor device comprising:
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a substrate; and a transistor over the substrate, the transistor comprising; a gate electrode; an oxide semiconductor layer including a channel; and a gate insulating film interposed between the gate electrode and the oxide semiconductor layer, wherein the oxide semiconductor layer includes; a first oxide semiconductor layer including a first crystalline region; a second oxide semiconductor layer including a second crystalline region, the second oxide semiconductor layer being over the first oxide semiconductor layer; and a third oxide semiconductor layer including a third crystalline region, the third oxide semiconductor layer being over the second oxide semiconductor layer, wherein the second crystalline region includes a first crystal, wherein the third crystalline region includes a second crystal, and wherein each of a c-axis of the first crystal and a c-axis of the second crystal is aligned substantially perpendicular to a surface of the substrate. - 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 substrate; and a transistor over the substrate, the transistor comprising; a gate electrode; an oxide semiconductor layer including a channel; and a gate insulating film interposed between the gate electrode and the oxide semiconductor layer, wherein the oxide semiconductor layer includes; a first oxide semiconductor layer including a first crystalline region; a second oxide semiconductor layer including a second crystalline region, the second oxide semiconductor layer being over the first oxide semiconductor layer; and a third oxide semiconductor layer including a third crystalline region, the third oxide semiconductor layer being over the second oxide semiconductor layer, wherein the second crystalline region includes a first crystal, wherein the third crystalline region includes a second crystal, wherein each of a c-axis of the first crystal and a c-axis of the second crystal is aligned substantially perpendicular to a surface of the substrate, and wherein a component of the first oxide semiconductor layer is different from a component of the second oxide semiconductor layer. - 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 substrate; and a transistor over the substrate, the transistor comprising; a first gate electrode; a gate insulating film over the first gate electrode; an oxide semiconductor layer including a channel over the gate insulating film; and a second gate electrode over the oxide semiconductor layer, wherein the oxide semiconductor layer includes; a first oxide semiconductor layer including a first crystalline region; a second oxide semiconductor layer including a second crystalline region, the second oxide semiconductor layer being over the first oxide semiconductor layer; and a third oxide semiconductor layer including a third crystalline region, the third oxide semiconductor layer being over the second oxide semiconductor layer, wherein the second crystalline region includes a first crystal, wherein the third crystalline region includes a second crystal, and wherein each of a c-axis of the first crystal and a c-axis of the second crystal is aligned substantially perpendicular to a surface of the substrate. - View Dependent Claims (22, 23, 24)
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25. A semiconductor device comprising:
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a substrate; and a transistor over the substrate, the transistor comprising; a first gate electrode; a gate insulating film over the first gate electrode; an oxide semiconductor layer including a channel over the gate insulating film; and a second gate electrode over the oxide semiconductor layer, wherein the oxide semiconductor layer includes; a first oxide semiconductor layer including a first crystalline region; a second oxide semiconductor layer including a second crystalline region, the second oxide semiconductor layer being over the first oxide semiconductor layer; and a third oxide semiconductor layer including a third crystalline region, the third oxide semiconductor layer being over the second oxide semiconductor layer, wherein the second crystalline region includes a first crystal, wherein the third crystalline region includes a second crystal, wherein each of a c-axis of the first crystal and a c-axis of the second crystal is aligned substantially perpendicular to a surface of the substrate, and wherein a component of the first oxide semiconductor layer is different from a component of the second oxide semiconductor layer. - View Dependent Claims (26, 27, 28)
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29. A semiconductor device comprising:
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a substrate; and a transistor over the substrate, the transistor comprising; a gate electrode; a first oxide semiconductor layer; a second oxide semiconductor layer over the first oxide semiconductor layer, the second oxide semiconductor layer comprising a crystalline region; and a third oxide semiconductor layer over the second oxide semiconductor layer, and a gate insulating film between the gate electrode and the first oxide semiconductor layer, wherein the crystalline region comprises a crystal structure in which a c-axis is substantially perpendicular to a surface of the substrate. - View Dependent Claims (30, 31, 32, 33, 34)
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35. A semiconductor device comprising:
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a substrate; and a transistor over the substrate, the transistor comprising; a gate electrode; a first oxide semiconductor layer; a second oxide semiconductor layer over the first oxide semiconductor layer, the second oxide semiconductor layer comprising a crystalline region; and a third oxide semiconductor layer over the second oxide semiconductor layer, and a gate insulating film between the gate electrode and the first oxide semiconductor layer, wherein the crystalline region comprises a crystal structure in which a c-axis is substantially perpendicular to a surface of the second oxide semiconductor layer. - View Dependent Claims (36, 37, 38, 39, 40)
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Specification