Patents by Inventor Ryosuke Motoyoshi

Ryosuke Motoyoshi 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: 9508880
    Abstract: It is an object to provide a method for processing a silicon substrate that can reduce surface reflectance as much as possible. The method includes a first step of forming a thin film including a metal having higher electronegativity than silicon and having a plurality of openings on a silicon substrate, a second step of soaking the silicon substrate subjected to the first step in a hydrofluoric acid solution containing oxidizer, and a third step of soaking the silicon substrate subjected to the second step in an ammonia aqueous solution containing oxidizer. By performing the steps in the above order, a minute uneven structure is formed on a surface of the silicon substrate to reduce the reflectance.
    Type: Grant
    Filed: October 11, 2012
    Date of Patent: November 29, 2016
    Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventors: Takashi Hirose, Ryosuke Motoyoshi
  • Patent number: 9214587
    Abstract: A photoelectric conversion module in which an output voltage defect is suppressed is obtained by forming in parallel over a substrate n number (n is a natural number) of integrated photoelectric conversion devices each including a plurality of cells that are connected in series, and electrically connecting in parallel n?1 number or less of integrated photoelectric conversion devices with normal electrical characteristics and excluding an integrated photoelectric conversion device with a characteristic defect such as a short-circuit between top and bottom electrodes or a leak current due to a structural defect or the like formed in a semiconductor layer or the like.
    Type: Grant
    Filed: August 18, 2011
    Date of Patent: December 15, 2015
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Kazuo Nishi, Yasushi Maeda, Ryosuke Motoyoshi, Yuji Oda, Kei Takahashi, Yoshiaki Ito, Tatsuji Nishijima
  • Publication number: 20120273036
    Abstract: To provide a photoelectric conversion device with less metal contamination and surface detects, and a manufacturing method thereof. The photoelectric conversion device is formed in the following manner: a surface of the single crystal silicon substrate is soaked in an alkaline solution to perform etching so that unevenness including a plurality of minute projections each having a substantially square pyramidal shape and a depression formed between the adjacent projections are formed; then, the single crystal silicon substrate having the unevenness is soaked in a mixed acid solution to perform etching so that at a cross section including a vertex of the projection and dividing each of a surface of the projection and a surface facing the aforementioned surface into two equal parts, the vertex of the projection forms an obtuse angle, and a bottom of the depression has a curved surface.
    Type: Application
    Filed: April 17, 2012
    Publication date: November 1, 2012
    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventors: Ryosuke MOTOYOSHI, Takashi Hirose, Naoto Kusumoto
  • Publication number: 20120042926
    Abstract: A photoelectric conversion module in which an output voltage defect is suppressed is obtained by forming in parallel over a substrate n number (n is a natural number) of integrated photoelectric conversion devices each including a plurality of cells that are connected in series, and electrically connecting in parallel n?1 number or less of integrated photoelectric conversion devices with normal electrical characteristics and excluding an integrated photoelectric conversion device with a characteristic defect such as a short-circuit between top and bottom electrodes or a leak current due to a structural defect or the like formed in a semiconductor layer or the like.
    Type: Application
    Filed: August 18, 2011
    Publication date: February 23, 2012
    Inventors: Kazuo Nishi, Yasushi Maeda, Ryosuke Motoyoshi, Yuji Oda, Kei Takahashi, Yoshiaki Ito, Tatsuji Nishijima