Patents by Inventor Yungryel Ryu

Yungryel Ryu 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).

  • Oxide films and process for preparing same
    Patent number: 6342313
    Abstract: A p-type oxide film and a process for preparing the film and p-n or n-p junctions is disclosed. In a preferred embodiment, a p-type zinc oxide film contains arsenic and is grown on a gallium arsenide substrate. The p-type oxide film has a net acceptor concentration of at least about 1015 acceptors/cm3, a resistivity of no greater than about 1 ohm-cm, and a Hall mobility of between about 0.1 and about 50 cm2/Vs.
    Type: Grant
    Filed: November 12, 1999
    Date of Patent: January 29, 2002
    Assignee: The Curators of the University of Missouri
    Inventors: Henry W. White, Shen Zhu, Yungryel Ryu
  • Zinc oxide films containing P-type dopant and process for preparing same
    Patent number: 6291085
    Abstract: A p-type zinc oxide film and a process for preparing the film is disclosed. In a preferred embodiment, the p-type zinc oxide film contains arsenic and is grown on a gallium arsenide substrate. The p-type zinc oxide film has a net acceptor concentration of at least about 1015 acceptors/cm3, a resistivity of no greater than about 1 ohm-cm, and a Hall mobility of between about 0.1 and about 50 cm2/Vs.
    Type: Grant
    Filed: August 3, 1998
    Date of Patent: September 18, 2001
    Assignee: The Curators of the University of Missouri
    Inventors: Henry W. White, Shen Zhu, Yungryel Ryu