Patents by Inventor Sang-Sig Choi

Sang-Sig Choi 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).

  • Transistor structure and manufacturing method thereof
    Patent number: 7786510
    Abstract: An HBT structure and manufacturing method thereof, in which the HBT structure includes an emitter, an intrinsic base, a collector, an insulating sidewall, and a stress-inducing base formed by selective epitaxial growth to locally induce a stress to the HBT structure. Compressive or tensile stress is additionally induced from outside to modify physical and electric properties of a semiconductor layer, thereby improving the performance of the transistor.
    Type: Grant
    Filed: February 16, 2007
    Date of Patent: August 31, 2010
    Assignee: Chonbuk National University
    Inventors: Kyu-Hwan Shim, Sang-Sig Choi, A-Ram Choi
  • Transistor structure and manufacturing method thereof
    Publication number: 20080116488
    Abstract: An HBT structure and manufacturing method thereof, in which the HBT structure includes an emitter, an intrinsic base, a collector, an insulating sidewall, and a stress-inducting base formed by selective epitaxial growth to locally induce a stress to the HBT structure. Compressive or tensile stress is additionally induced from outside to modify physical and electric properties of a semiconductor layer, thereby improving the performance of the transistor.
    Type: Application
    Filed: February 16, 2007
    Publication date: May 22, 2008
    Inventors: Kyu-Hwan Shim, Sang-Sig Choi, A-Ram Choi