Patents by Inventor Katsushi NISHIYAMA

Katsushi NISHIYAMA 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).

  • Patent number: 11087986
    Abstract: To enhance efficiency of a process of implanting impurities into a silicon carbide semiconductor layer. To provide a method of manufacturing a semiconductor device including a silicon carbide semiconductor layer, the method of manufacturing including: implanting impurities multiple times to an impurity implantation region in the silicon carbide semiconductor layer to different depths, with temperature of the silicon carbide semiconductor layer being set to be equal to or lower than 150° C. In the implanting, impurities may be implanted multiple times to the impurity implantation region to different depths, with temperature of the silicon carbide semiconductor layer being set to be equal to or higher than room temperature.
    Type: Grant
    Filed: March 30, 2020
    Date of Patent: August 10, 2021
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventors: Katsushi Nishiyama, Masayuki Miyazaki, Shoji Kitamura
  • Publication number: 20200227261
    Abstract: To enhance efficiency of a process of implanting impurities into a silicon carbide semiconductor layer. To provide a method of manufacturing a semiconductor device including a silicon carbide semiconductor layer, the method of manufacturing including: implanting impurities multiple times to an impurity implantation region in the silicon carbide semiconductor layer to different depths, with temperature of the silicon carbide semiconductor layer being set to be equal to or lower than 150° C. In the implanting, impurities may be implanted multiple times to the impurity implantation region to different depths, with temperature of the silicon carbide semiconductor layer being set to be equal to or higher than room temperature.
    Type: Application
    Filed: March 30, 2020
    Publication date: July 16, 2020
    Inventors: Katsushi NISHIYAMA, Masayuki MIYAZAKI, Shoji KITAMURA
  • Patent number: 10622212
    Abstract: To enhance efficiency of a process of implanting impurities into a silicon carbide semiconductor layer. To provide a method of manufacturing a semiconductor device including a silicon carbide semiconductor layer, the method of manufacturing including: implanting impurities multiple times to an impurity implantation region in the silicon carbide semiconductor layer to different depths, with temperature of the silicon carbide semiconductor layer being set to be equal to or lower than 150° C. In the implanting, impurities may be implanted multiple times to the impurity implantation region to different depths, with temperature of the silicon carbide semiconductor layer being set to be equal to or higher than room temperature.
    Type: Grant
    Filed: May 23, 2018
    Date of Patent: April 14, 2020
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventors: Katsushi Nishiyama, Masayuki Miyazaki, Shoji Kitamura
  • Publication number: 20180301337
    Abstract: To enhance efficiency of a process of implanting impurities into a silicon carbide semiconductor layer. To provide a method of manufacturing a semiconductor device including a silicon carbide semiconductor layer, the method of manufacturing including: implanting impurities multiple times to an impurity implantation region in the silicon carbide semiconductor layer to different depths, with temperature of the silicon carbide semiconductor layer being set to be equal to or lower than 150° C. In the implanting, impurities may be implanted multiple times to the impurity implantation region to different depths, with temperature of the silicon carbide semiconductor layer being set to be equal to or higher than room temperature.
    Type: Application
    Filed: May 23, 2018
    Publication date: October 18, 2018
    Inventors: Katsushi NISHIYAMA, Masayuki MIYAZAKI, Shoji KITAMURA