Patents by Inventor Woorihan Kim

Woorihan Kim 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).

  • Publication number: 20140001484
    Abstract: A method of manufacturing a gallium nitride (GaN) substrate and a GaN substrate manufactured by the same. The method includes the steps of growing a GaN film on a base substrate and separating the base substrate from the GaN film. The step of growing the GaN film includes forming pits in the GaN film, the pits inducing an inversion domain boundary to be formed inside the GaN film. The GaN substrate can have a predetermined thickness with which it can be handled during layer transfer (LT) processing, and the warping of the GaN substrate can be minimized, thereby preventing cracks due to warping.
    Type: Application
    Filed: June 26, 2013
    Publication date: January 2, 2014
    Inventors: Sungkeun Lim, Boik Park, KwangJe Woo, Woorihan Kim, Joon Hoi Kim, Cheolmin Park, Junyoung Bae, DongYong Lee, Wonjo Lee, JunSung Choi
  • Publication number: 20130328059
    Abstract: A method of manufacturing a gallium nitride (GaN) substrate and a GaN substrate manufactured thereby. The method includes the steps of growing an aluminum nitride nucleation layer on a base substrate, growing a first gallium nitride film on the base substrate on which the aluminum nitride nucleation layer has been grown, the first gallium nitride film having a first content ratio of nitrogen to gallium, and growing a second gallium nitride film on the first gallium nitride film, the second gallium nitride film having a second content ratio of nitrogen to gallium which is lower than the first content ratio. Self-separation between the base substrate and the GaN substrate is possible during the growth process, thereby precluding mechanical separation, increasing a self-separation area, and minimizing the occurrence of warping.
    Type: Application
    Filed: June 7, 2013
    Publication date: December 12, 2013
    Inventors: SungKeun Lim, Boik Park, CheolMin Park, DongYong Lee, Woorihan Kim, Joon Hoi Kim, JunYoung Bae, WonJo Lee, JunSung Choi