Patents by Inventor Kenneth Irvine

Kenneth Irvine has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Buffer structure between silicon carbide and gallium nitride and resulting semiconductor devices
    Patent number: 5393993
    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.
    Type: Grant
    Filed: December 13, 1993
    Date of Patent: February 28, 1995
    Assignee: Cree Research, Inc.
    Inventors: John A. Edmond, Vladimir Dmitriev, Kenneth Irvine