Patents by Inventor Yun-Chi Yang

Yun-Chi Yang 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).

  • Method for forming a flash memory by using a microcrystalline polysilicon layer as a floating gate
    Publication number: 20040009651
    Abstract: This invention provides a method for forming polysilicon by using silane with introducing hydrogen, such that polysilicon is microcrystalline. This microcrystal polysilicon can be applied to floating gate of flash memory to improve the character of flash memory.
    Type: Application
    Filed: July 11, 2002
    Publication date: January 15, 2004
    Applicant: Macronix International Co., Ltd.
    Inventors: Tzung-Ting Han, Chin-Ta Su, Yun-Chi Yang
  • Method for determining near-surface doping concentration
    Patent number: 6326220
    Abstract: A method for determining near-surface doping concentration is provided by utilizing surface photovoltage. A monochromatic light pulse is applied to a semiconductor substrate. When the energy of the incident light is larger than the energy gap of the semiconductor substrate, the light is absorbed by the substrate and thereby generates enough charge carriers. The carriers diffuse to the surface of the substrate and result in lowering the surface barrier, and hence, cause a shift of the surface voltage. The difference of the surface voltages, before and after the light pulse applied, is measured by using a surface photovoltage probe. Then, the doping concentration near the surface of the substrate can be determined according to the difference of the surface voltage.
    Type: Grant
    Filed: November 11, 2000
    Date of Patent: December 4, 2001
    Assignee: Macronix International Co., Ltd.
    Inventors: Wei-Wen Chen, Yaw-Lin Hwang, Yun-Chi Yang