Buffer structure between silicon carbide and gallium nitride and resulting semiconductor devices
First Claim
1. A transition crystal structure for providing a good lattice and thermal match between single crystal silicon carbide and a layer of single crystal gallium nitride, said transition structure comprising:
- a buffer formed ofa first layer of gallium nitride and aluminum nitride; and
a second layer of gallium nitride and aluminum nitride adjacent to said first layer, and in which the mole percentage of aluminum nitride in said second layer is substantially different from the mole percentage of aluminum nitride in said first layer; and
a layer of single crystal gallium nitride upon said second layer of gallium nitride and aluminum nitride.
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Abstract
A transition crystal structure is disclosed for providing a good lattice and thermal match between a layer of single crystal silicon carbide and a layer of single crystal gallium nitride. The transition structure comprises a buffer formed of a first layer of gallium nitride and aluminum nitride, and a second layer of gallium nitride and aluminum nitride adjacent to the first layer. The mole percentage of aluminum nitride in the second layer is substantially different from the mole percentage of aluminum nitride in the first layer. A layer of single crystal gallium nitride is formed upon the second layer of gallium nitride. In preferred embodiments, the buffer further comprises an epitaxial layer of aluminum nitride upon a silicon carbide substrate.
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Citations
27 Claims
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1. A transition crystal structure for providing a good lattice and thermal match between single crystal silicon carbide and a layer of single crystal gallium nitride, said transition structure comprising:
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a buffer formed of a first layer of gallium nitride and aluminum nitride; and a second layer of gallium nitride and aluminum nitride adjacent to said first layer, and in which the mole percentage of aluminum nitride in said second layer is substantially different from the mole percentage of aluminum nitride in said first layer; and a layer of single crystal gallium nitride upon said second layer of gallium nitride and aluminum nitride. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A vertical device precursor structure comprising:
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a single crystal silicon carbide substrate; a buffer upon said substrate; and a single crystal layer of gallium nitride upon said buffer; wherein said buffer comprises, an epitaxial layer of aluminum nitride upon said silicon carbide substrate a first layer of gallium nitride and aluminum nitride; and a second layer of gallium nitride and aluminum nitride adjacent to said first layer, and in which the mole percentage of aluminum nitride in said second layer is substantially different from the mole percentage of aluminum nitride in said first layer. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A vertical light emitting diode formed from single crystal gallium nitride upon single crystal silicon carbide, said light emitting diode comprising:
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a single crystal silicon carbide substrate; a buffer upon said substrate; a first single crystal layer of gallium nitride upon said buffer and having a first conductivity type; a second single crystal layer of gallium nitride upon said first gallium nitride layer, and having the opposite conductivity type from said first gallium nitride layer, said first and second layers forming a p-n junction therebetween; and ohmic contacts to said substrate and to said second gallium nitride layer; wherein said buffer comprises, an epitaxial layer of aluminum nitride upon said silicon carbide substrate, a first layer of gallium nitride and aluminum nitride, and a second layer of gallium nitride and aluminum nitride adjacent to said first layer, and in which the mole percentage of aluminum nitride in said second layer is substantially different from the mole percentage of aluminum nitride in said first layer. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification