Formation of group III-V nitride films on sapphire substrates with reduced dislocation densities
First Claim
1. A semiconductor structure, comprising:
- a substrate;
an interlayer formed on the substrate, the interlayer including a single atomic layer of atoms of at least one group II element; and
a group III-V nitride film formed on the interlayer.
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Abstract
A single layer of atoms of a selected valence is deposited between a substrate and a group III-V nitride film to improve the quality of the nitride film and of subsequently deposited nitride films on the substrate. The interlayer provides local charge neutrality at the interface, thereby promoting two-dimensional growth of the nitride film and reduced dislocation densities. When the substrate is sapphire, the interlayer should include atoms of group II elements and possibly group III elements. The structure can include a group III-V nitride buffer layer on the interlayer to further enhance the quality of the group III-V nitride films. The structures can be used in blue light emitting optoelectronic devices.
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Citations
40 Claims
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1. A semiconductor structure, comprising:
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a substrate; an interlayer formed on the substrate, the interlayer including a single atomic layer of atoms of at least one group II element; and a group III-V nitride film formed on the interlayer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A semiconductor structure comprising:
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a substrate; an interlayer formed on the substrate, the interlayer including a single atomic layer of atoms of at least one group II element; a group III-V nitride buffer layer formed on the interlayer; and an epitaxial group III-V nitride film formed on the buffer layer. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method of forming a semiconductor structure, comprising:
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providing a substrate; forming an interlayer including a single atomic layer of atoms of at least one group II element on the substrate; and forming a group III-V nitride layer on the interlayer. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification