Patents by Inventor Yohei IKEBE

Yohei IKEBE 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: 20170038673
    Abstract: To provide a reflective mask blank which may inhibit a variation in reflectance with respect to EUV light due to counter diffusion between a protective film and a material of an adjacent phase-shift film pattern caused by thermal diffusion even if the power of an exposure light source of an EUV exposure machine becomes high; a reflective mask manufactured therefrom; and a method for manufacturing a semiconductor device. The reflective mask blank comprises a multilayer reflective film 13, protective film 14, and phase-shift film 16 for shifting a phase of the EUV light, which are formed in said order on a substrate 12.
    Type: Application
    Filed: November 26, 2014
    Publication date: February 9, 2017
    Inventors: Yohei IKEBE, Takahiro ONOUE, Tsutomu SHOKI
  • Publication number: 20160004153
    Abstract: A method of manufacturing a reflective mask blank comprising a multilayer reflective film formed on a substrate so as to reflect EUV light; and a laminated film formed on the multilayer reflective film. The method includes the steps of depositing the multilayer reflective film on the substrate to form a multilayer reflective film formed substrate; carrying out defect inspection for the multilayer reflective film formed substrate; depositing the laminated film on the multilayer reflective film of the multilayer reflective film formed substrate; forming a fiducial mark for an upper portion of the laminated film to thereby form a reflective mask blank comprising the fiducial mark, the fiducial mark serving as a reference for a defect position in defect information; and carrying out defect inspection of the reflective mask blank by using the fiducial mark as a reference.
    Type: Application
    Filed: February 20, 2014
    Publication date: January 7, 2016
    Inventors: Tsutomu SHOKI, Kazuhiro HAMAMOTO, Yohei IKEBE