Patents by Inventor Hirofumi Senta

Hirofumi Senta 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: 9224903
    Abstract: A method for manufacturing a photoelectric converter, comprising: forming a first buffer layer comprising a metal sulfide on a light-absorbing layer comprising a Group I-III-VI compound or a Group I-II-IV-VI compound; and contacting a surface of the first buffer layer with a first solution comprising an alkali metal compound.
    Type: Grant
    Filed: March 11, 2013
    Date of Patent: December 29, 2015
    Assignee: KYOCERA Corporation
    Inventors: Takeshi Suzuki, Riichi Sasamori, Junji Aranami, Hirofumi Senta
  • Publication number: 20150118789
    Abstract: A method for manufacturing a photoelectric converter (11), comprising: a first step of forming a first buffer layer (4) comprising a metal sulfide on a light-absorbing layer (3) comprising a Group I-III-VI compound or a Group I-II-IV-VI compound; and a second step of contacting a surface of the first buffer layer (4) with a first solution comprising an alkali metal compound.
    Type: Application
    Filed: March 11, 2013
    Publication date: April 30, 2015
    Inventors: Takeshi Suzuki, Riichi Sasamori, Junji Aranami, Hirofumi Senta
  • Patent number: 7910916
    Abstract: In a photoelectric conversion device, in a contact between a p-type semiconductor 3a and an electrode 2, an n-type semiconductor 6 of a conductivity type opposite to that of the p-type semiconductor is provided between the p-type semiconductor 3a and the electrode 2. The existence of the n-type semiconductor 6 allows a recombination rate of photo-generated carriers excited by incident light to be effectively reduced, and allows a dark current component to be effectively prevented from being produced. Therefore, it is possible to improve photoelectric conversion efficiency as well as to stabilize characteristics. Further, a tunnel junction is realized by increasing the concentration of a doping element in at least one or preferably both of the p-type semiconductor 3a and the n-type semiconductor 6 in a region where they are in contact with each other, thereby keeping ohmic characteristics between the semiconductor and the electrode good.
    Type: Grant
    Filed: June 8, 2009
    Date of Patent: March 22, 2011
    Assignee: Kyocera Corporation
    Inventors: Koichiro Niira, Hirofumi Senta, Hideki Hakuma
  • Publication number: 20090272423
    Abstract: In a photoelectric conversion device, in a contact between a p-type semiconductor 3a and an electrode 2, an n-type semiconductor 6 of a conductivity type opposite to that of the p-type semiconductor is provided between the p-type semiconductor 3a and the electrode 2. The existence of the n-type semiconductor 6 allows a recombination rate of photo-generated carriers excited by incident light to be effectively reduced, and allows a dark current component to be effectively prevented from being produced. Therefore, it is possible to improve photoelectric conversion efficiency as well as to stabilize characteristics. Further, a tunnel junction is realized by increasing the concentration of a doping element in at least one or preferably both of the p-type semiconductor 3a and the n-type semiconductor 6 in a region where they are in contact with each other, thereby keeping ohmic characteristics between the semiconductor and the electrode good.
    Type: Application
    Filed: June 8, 2009
    Publication date: November 5, 2009
    Applicant: KYOCERA CORPORATION
    Inventors: Koichiro NIIRA, Hirofumi SENTA, Hideki HAKUMA
  • Patent number: 7560750
    Abstract: In a photoelectric conversion device, in a contact between a p-type semiconductor 3a and an electrode 2, an n-type semiconductor 6 of a conductivity type opposite to that of the p-type semiconductor is provided between the p-type semiconductor 3a and the electrode 2. The existence of the n-type semiconductor 6 allows a recombination rate of photo-generated carriers excited by incident light to be effectively reduced, and allows a dark current component to be effectively prevented from being produced. Therefore, it is possible to improve photoelectric conversion efficiency as well as to stabilize characteristics. Further, a tunnel junction is realized by increasing the concentration of a doping element in at least one or preferably both of the p-type semiconductor 3a and the n-type semiconductor 6 in a region where they are in contact with each other, thereby keeping ohmic characteristics between the semiconductor and the electrode good.
    Type: Grant
    Filed: June 25, 2004
    Date of Patent: July 14, 2009
    Assignee: Kyocera Corporation
    Inventors: Koichiro Niira, Hirofumi Senta, Hideki Hakuma
  • Patent number: 7001831
    Abstract: A non-Si non-C-based gas is heated by a thermal catalysis body provided in a gas introduction channel, and the heated non-Si non-C-based gas and a material-based gas comprising Si and/or C are separately introduced into a film deposition space through a showerhead having a plurality of gas effusion ports, and in the film deposition space, a plasma space is formed by a nonplanar electrode connected to a radio frequency power supply, thereby forming a film on a substrate. Formation of high-quality Si-based films and C-based films can thus be accomplished at high deposition rate over large area with uniform film thickness and homogeneous quality. Also, highly efficient devices including photoelectric conversion devices represented by solar cells can be manufactured at low-cost by the use of such films.
    Type: Grant
    Filed: February 20, 2003
    Date of Patent: February 21, 2006
    Assignee: Kyocera Corporation
    Inventors: Koichiro Niira, Hirofumi Senta, Hideki Hakuma, Hiroki Okui
  • Publication number: 20050115602
    Abstract: A photo-electric conversion array is formed by connecting photo-electric conversion cells in series. Each photo-electric conversion cell includes: a substrate, at least one main surface of which is made of a conductor layer; plural crystalline semiconductor particles provided on the conductor surface of the substrate; an insulation layer filled in clearances among the crystalline semiconductor particles; a transparent electric conducting layer provided above the plural crystalline semiconductor particles; a collector electrode, formed on the transparent electric conducting layer, to collect electricity from the transparent electric conducting layer.
    Type: Application
    Filed: July 15, 2004
    Publication date: June 2, 2005
    Inventors: Hirofumi Senta, Takeshi Kyoda, Kenichi Okada, Hisao Arimune
  • Publication number: 20050012095
    Abstract: In a photoelectric conversion device, in a contact between a p-type semiconductor 3a and an electrode 2, an n-type semiconductor 6 of a conductivity type opposite to that of the p-type semiconductor is provided between the p-type semiconductor 3a and the electrode 2. The existence of the n-type semiconductor 6 allows a recombination rate of photo-generated carriers excited by incident light to be effectively reduced, and allows a dark current component to be effectively prevented from being produced. Therefore, it is possible to improve photoelectric conversion efficiency as well as to stabilize characteristics. Further, a tunnel junction is realized by increasing the concentration of a doping element in at least one or preferably both of the p-type semiconductor 3a and the n-type semiconductor 6 in a region where they are in contact with each other, thereby keeping ohmic characteristics between the semiconductor and the electrode good.
    Type: Application
    Filed: June 25, 2004
    Publication date: January 20, 2005
    Inventors: Koichiro Niira, Hirofumi Senta, Hideki Hakuma
  • Publication number: 20030176011
    Abstract: A non-Si non-C-based gas is heated by a thermal catalysis body provided in a gas introduction channel, and the heated non-Si non-C-based gas and a material-based gas comprising Si and/or C are separately introduced into a film deposition space through a showerhead having a plurality of gas effusion ports, and in the film deposition space, a plasma space is formed by a nonplanar electrode connected to a radio frequency power supply, thereby forming a film on a substrate. Formation of high-quality Si-based films and C-based films can thus be accomplished at high deposition rate over large area with uniform film thickness and homogeneous quality. Also, highly efficient devices including photoelectric conversion devices represented by solar cells can be manufactured at low-cost by the use of such films.
    Type: Application
    Filed: February 20, 2003
    Publication date: September 18, 2003
    Applicant: KYOCERA CORPORATION
    Inventors: Koichiro Niira, Hirofumi Senta, Hideki Hakuma, Hiroki Okui