Patents by Inventor Kunta Yoshikawa

Kunta Yoshikawa 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: 20180006165
    Abstract: The solar cell includes a plurality of light-receiving-side finger electrodes on a light-receiving surface of a photoelectric conversion section having a semiconductor junction. The light-receiving surface of the photoelectric conversion section is covered with a first insulating layer. Each light-receiving-side finger electrodes include: a first metal seed layer provided between the photoelectric conversion section and the first insulating layer; and a first plating metal layer being conduction with the first metal seed layer through openings formed in the first insulating layer. The solar cell includes an isolated plating metal layer pieces contacting neither the light-receiving-side finger electrodes nor the back-side finger electrodes. On the surface of the first insulating layer, an isolated plating metal crowded region is present in a form of a band-shape extending parallel to an extending direction of the light-receiving-side finger electrodes.
    Type: Application
    Filed: January 7, 2016
    Publication date: January 4, 2018
    Inventors: Kunta YOSHIKAWA, Daisuke ADACHI, Toru TERASHITA, Masafumi HIRAISHI
  • Publication number: 20170200839
    Abstract: A solar cell is provided with an electrode layer on a photovoltaic conversion section including a crystalline silicon substrate. Deposition of the electrode layer is performed by a deposit-up method with a substrate being mounted in such a manner that an opening edge portion of a mask plate having an opening is in contact with the substrate. The opening edge portion of the mask plate has a tapered surface at a part that is in contact with first principal surface of the substrate, the tapered surface conforming to a deflection angle at a peripheral end of the substrate. A solar cell having a large effective area can be prepared by suppressing deposition of electrode layer on mask-covered region due to penetration.
    Type: Application
    Filed: March 29, 2017
    Publication date: July 13, 2017
    Applicant: Kaneka Corporation
    Inventors: Kunihiro Nakano, Kunta Yoshikawa, Daisuke Adachi
  • Publication number: 20170125619
    Abstract: In the solar cell module, a first solar cell and a second solar cell are stacked together with an electroconductive member interposed therebetween, such that a cleaved surface-side periphery on a light-receiving surface of the first solar cell overlaps a periphery on a back surface of the second solar cell. The first solar cell and the second solar cell each have: photoelectric conversion section including a crystalline silicon substrate; collecting electrode; and back electrode. At a section where the first solar cell and the second solar cell are stacked, the collecting electrode of the first solar cell and the back electrode of the second solar cell are electrically connected to each other by coming into contact with the electroconductive member. An insulating member is provided on a part of the cleaved surface-side periphery on the light-receiving surface of the first solar cell, where the collecting electrode is not provided.
    Type: Application
    Filed: March 26, 2015
    Publication date: May 4, 2017
    Inventors: Kunihiro Nakano, Kunta Yoshikawa, Toru Terashita, Masafumi Hiraishi, Kenji Yamamoto
  • Publication number: 20160329862
    Abstract: An I-V measurement method is provided for a solar cell having a collecting electrode on the first surface side of a single-crystalline silicon substrate of a first conductivity type and having a transparent electrode on the outermost surface on the second surface side of the single-crystalline silicon substrate of the first conductivity-type. An electric current is supplied to the solar cell in a state in which flexible metal foil and the transparent electrode are brought into detachable contact with each other such that the flexible metal foil follows undulations of the single-crystalline silicon substrate of a first conductivity type, and the first surface is set as a light-receiving surface. It is preferable that at least on a portion that is in contact with the transparent electrode, the metal foil is formed of at least one selected from the group consisting of Sn, Ag, Ni, In, and Cu.
    Type: Application
    Filed: December 22, 2014
    Publication date: November 10, 2016
    Inventors: Kunta Yoshikawa, Hayato Kawasaki, Kunihiro Nakano, Kenji Yamamoto
  • Publication number: 20160308079
    Abstract: A photoelectric conversion section of a solar cell has a first electrode layer and a collecting electrode that are formed in this order on a first principal surface, and has a second electrode layer that is formed on a second principal surface. The collecting electrode includes a first electroconductive layer, an insulating layer, and a second electroconductive layer in this order on the first electrode layer. The first and second electroconductive layers are electrically connected via an opening section in the insulating layer. At peripheral edge of the first and second principal surfaces, the photoelectric conversion section has an insulating region excluding the first or second electrode layer. On the side of the principal surface having no insulating region, the first or second electrode layer is formed up to the peripheral end of the relevant principal surface.
    Type: Application
    Filed: October 29, 2014
    Publication date: October 20, 2016
    Inventors: Daisuke Adachi, Kunta Yoshikawa
  • Patent number: 9166089
    Abstract: Provided is a thin film solar cell module including series-connected unit cells, wherein a thin film silicon photoelectric conversion unit and a compound semiconductor-containing photoelectric conversion unit are electrically connected in each unit cell. Each unit cell includes at least a transparent electrode, an amorphous silicon-containing photoelectric conversion unit, an intermediate transparent electrode layer, a photoelectric conversion unit, a compound semiconductor-based photoelectric conversion unit, and a metal electrode in this order from the light incident side. In each of the unit cells, the photoelectric conversion unit and the compound semiconductor-based photoelectric conversion unit are connected in series to form a series-connected component. The series-connected component is connected to a first photoelectric conversion unit in parallel via the transparent electrode and the intermediate transparent electrode layer.
    Type: Grant
    Filed: February 19, 2010
    Date of Patent: October 20, 2015
    Assignee: KANEKA CORPORATION
    Inventors: Kunta Yoshikawa, Mitsuru Ichikawa, Kenji Yamamoto
  • Patent number: 9147780
    Abstract: In a solar cell, a collecting electrode is provided on a transparent electrode of a photoelectric conversion section having the transparent electrode on the outermost surface on one main surface side. The collecting electrode includes a first electroconductive layer and a second electroconductive layer in this order from the photoelectric conversion section side. Preferably, a self-assembled monolayer is formed on a region on the transparent electrode layer, which is not provided with the first electroconductive layer. A method for manufacturing the solar cell includes: forming a first electroconductive layer on a transparent electrode layer; forming a self-assembled monolayer on a region on the transparent electrode layer, which is not provided with the first electroconductive layer; and bringing the first electroconductive layer and a plating solution into contact with each other to form the second electroconductive layer by a plating method, in this order.
    Type: Grant
    Filed: November 25, 2013
    Date of Patent: September 29, 2015
    Assignee: KANEKA CORPORATION
    Inventors: Nick Valckx, Masanori Kanematsu, Jose Luis Hernandez, Daisuke Adachi, Kunta Yoshikawa
  • Publication number: 20150171241
    Abstract: In a solar cell, a collecting electrode is provided on a transparent electrode of a photoelectric conversion section having the transparent electrode on the outermost surface on one main surface side. The collecting electrode includes a first electroconductive layer and a second electroconductive layer in this order from the photoelectric conversion section side. Preferably, a self-assembled monolayer is formed on a region on the transparent electrode layer, which is not provided with the first electroconductive layer. A method for manufacturing the solar cell includes: forming a first electroconductive layer on a transparent electrode layer; forming a self-assembled monolayer on a region on the transparent electrode layer, which is not provided with the first electroconductive layer; and bringing the first electroconductive layer and a plating solution into contact with each other to form the second electroconductive layer by a plating method, in this order.
    Type: Application
    Filed: November 25, 2013
    Publication date: June 18, 2015
    Applicant: KANEKA CORPORATION
    Inventors: Nick Valckx, Masanori Kanematsu, Jose Luis Hernandez, Daisuke Adachi, Kunta Yoshikawa
  • Patent number: 8546685
    Abstract: Provided is a hetero-junction solar cell with a silicon crystalline substrate of small thickness but exhibiting less warpage, and having a high photoelectric conversion efficiency. The crystalline silicon substrate has a thickness of 50 ?m to 200 ?m, and has a rough structure on the light-incident-side surface thereof. The surface of the transparent conductive layer in the light incidence side has an irregular structure. The top-bottom distance in the irregular structure of the transparent conductive layer in the light-incidence-side is preferably smaller than the top-bottom distance in the rough structure of the crystalline silicon substrate in the-light-incidence side. The distance between tops of the projections in the irregular structure on the surface of the transparent conductive layer in the light incidence side is preferably smaller than the distance between tops of the projections in the rough structure on the surface of the crystalline silicon substrate in the light incidence side.
    Type: Grant
    Filed: July 2, 2010
    Date of Patent: October 1, 2013
    Assignee: Kaneka Corporation
    Inventors: Daisuke Adachi, Kunta Yoshikawa, Kenji Yamamoto
  • Patent number: 8530267
    Abstract: A method for manufacturing a silicon-based thin film solar cell including a crystalline silicon photoelectric conversion unit which contains a p-type layer (4p), a crystalline i-type silicon photoelectric conversion layer (4ic), and an n-type layer (4nc) stacked in this order from a transparent substrate side is provided. In one example, an n-type silicon-based thin film layer (4na) is formed on the crystalline i-type silicon photoelectric conversion layer (4ic), the n-type silicon-based thin film layer (4na) having an n-type silicon alloy layer having a film thickness of 1-12 nm and being in contact with the crystalline i-type silicon photoelectric conversion layer.
    Type: Grant
    Filed: October 9, 2009
    Date of Patent: September 10, 2013
    Assignee: Kaneka Corporation
    Inventors: Kunta Yoshikawa, Mitsuru Ichikawa, Kenji Yamamoto
  • Patent number: 8410355
    Abstract: This invention intends to develop a technique for forming an interlayer with excellent optical characteristics and to provide a photoelectric conversion device having high conversion efficiency. To realize this purpose, a series connection through an intermediate layer is formed in the thin-film photoelectric conversion device of the invention, and the interlayer is a transparent oxide layer in its front surface and n pairs of layers stacked therebehind (n is an integer of 1 or more), wherein each of the pair of layers is a carbon layer and a transparent oxide layer stacked in this order. Film thicknesses of each layer are optimized to improve wavelength selectivity and stress resistance while keeping the series resistance.
    Type: Grant
    Filed: October 30, 2008
    Date of Patent: April 2, 2013
    Assignee: Kaneka Corporation
    Inventors: Tomomi Meguro, Mitsuru Ichikawa, Fumiyasu Sezaki, Kunta Yoshikawa, Takashi Kuchiyama, Kenji Yamamoto
  • Publication number: 20120097244
    Abstract: Provided is a hetero-junction solar cell with a silicon crystalline substrate of small thickness but exhibiting less warpage, and having a high photoelectric conversion efficiency. The crystalline silicon substrate has a thickness of 50 ?m to 200 ?m, and has a rough structure on the light-incident-side surface thereof. The surface of the transparent conductive layer in the light incidence side has an irregular structure. The top-bottom distance in the irregular structure of the transparent conductive layer in the light-incidence-side is preferably smaller than the top-bottom distance in the rough structure of the crystalline silicon substrate in the-light-incidence side. The distance between tops of the projections in the irregular structure on the surface of the transparent conductive layer in the light incidence side is preferably smaller than the distance between tops of the projections in the rough structure on the surface of the crystalline silicon substrate in the light incidence side.
    Type: Application
    Filed: July 2, 2010
    Publication date: April 26, 2012
    Applicant: KANEKA CORPORATION
    Inventors: Daisuke Adachi, Kunta Yoshikawa, Kenji Yamamoto
  • Publication number: 20110315190
    Abstract: Provided is a thin film solar cell module including series-connected unit cells, wherein a thin film silicon photoelectric conversion unit and a compound semiconductor-containing photoelectric conversion unit are electrically connected in each unit cell. Each unit cell includes at least a transparent electrode, an amorphous silicon-containing photoelectric conversion unit, an intermediate transparent electrode layer, a photoelectric conversion unit, a compound semiconductor-based photoelectric conversion unit, and a metal electrode in this order from the light incident side. In each of the unit cells, the photoelectric conversion unit and the compound semiconductor-based photoelectric conversion unit are connected in series to form a series-connected component. The series-connected component is connected to a first photoelectric conversion unit in parallel via the transparent electrode and the intermediate transparent electrode layer.
    Type: Application
    Filed: February 19, 2010
    Publication date: December 29, 2011
    Applicant: KANEKA CORPORATION
    Inventors: Kunta Yoshikawa, Mitsuru Ichikawa, Kenji Yamamoto
  • Publication number: 20110197957
    Abstract: A method for manufacturing a silicon-based thin film solar cell including a crystalline silicon photoelectric conversion unit which contains a p-type layer (4p), a crystalline i-type silicon photoelectric conversion layer (4ic), and an n-type layer (4nc) stacked in this order from a transparent substrate side is provided. In one example, an n-type silicon-based thin film layer (4na) is formed on the crystalline i-type silicon photoelectric conversion layer (4ic), there is formed an the n-type silicon-based thin film layer (4na) having an n-type silicon alloy layer having a film thickness of 1-12 nm and being in contact with the crystalline i-type silicon photoelectric conversion layer.
    Type: Application
    Filed: October 9, 2009
    Publication date: August 18, 2011
    Applicant: KANEKA CORPORATION
    Inventors: Kunta Yoshikawa, Mitsuru Ichikawa, Kenji Yamamoto
  • Publication number: 20100243058
    Abstract: This invention intends to develop a technique for forming an interlayer with excellent optical characteristics and to provide a photoelectric conversion device having high conversion efficiency. To realize this purpose, a series connection through an intermediate layer is formed in the thin-film photoelectric conversion device of the invention, and the interlayer is a transparent oxide layer in its front surface and n pairs of layers stacked therebehind (n is an integer of 1 or more), wherein each of the pair of layers is a carbon layer and a transparent oxide layer stacked in this order. Film thicknesses of each layer are optimized to improve wavelength selectivity and stress resistance while keeping the series resistance.
    Type: Application
    Filed: October 30, 2008
    Publication date: September 30, 2010
    Applicant: KANEKA CORPORATION
    Inventors: Tomomi Meguro, Mitsuru Ichikawa, Fumiyasu Sezaki, Kunta Yoshikawa, Takashi Kuchiyama, Kenji Yamamoto