Patents by Inventor Koichiro Niira

Koichiro Niira 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: 9735293
    Abstract: This solar cell element, which is increased in the conversion efficiency due to improved effect of passivation, includes a semiconductor substrate in which a p-type first semiconductor region and an n-type second semiconductor region are stacked such that the first semiconductor region is located nearmost a first principal surface side and the second semiconductor region is located nearmost a second principal surface side; and a first passivation film containing aluminum oxide and arranged on the first principal surface side of the first semiconductor region. In the inside of the first passivation film of the solar cell element, the first ratio obtained by dividing the aluminum atomic density by the oxygen atomic density is 0.613 or more and less than 0.667 and the second ratio obtained by dividing the sum of the aluminum atomic density and the hydrogen atomic density by the oxygen atomic density is 0.667 or more and less than 0.786.
    Type: Grant
    Filed: March 28, 2013
    Date of Patent: August 15, 2017
    Assignee: Kyocera Corporation
    Inventors: Kouji Miyamoto, Shigeo Aono, Tomofumi Honjo, Shiro Miyazaki, Masahiro Tanaka, Koichiro Niira, Kenichi Kurobe
  • Publication number: 20160225920
    Abstract: A surface electrode (5) is installed on the light receiving surface of a solar cell element, the surface electrode (5) comprises three bus bar electrodes (5a) for extracting light-produced at the solar cell element to the outside and collecting finger electrodes (5b) connected to these bus bar electrodes (5a), and the bus bar electrodes (5a) are not less than 0.5 mm and not more than 2 mm in width and the finger electrodes (5b) are not less than 0.05 mm and not more than 0.1 mm in width. A high-efficient solar cell module can be obtained with substantially lowered resistance by increasing the number of bus bar electrode (5a) and thereby decreasing the lengths of the finger electrodes (5b).
    Type: Application
    Filed: April 12, 2016
    Publication date: August 4, 2016
    Inventors: Shuichi FUJII, Yosuke INOMATA, Tomonari SAKAMOTO, Koichiro NIIRA, Yuko FUKAWA, Hiroshi MORITA, Koji NISHI, Tatsuya YASHIKI, Mitsuo YAMASHITA, Kenji FUKUI
  • Patent number: 9206513
    Abstract: First and second electrodes are apart from each other in a chamber. Plates are disposed on a substrate in the second electrode. Each of the plates comprises first and second parts for supplying first and second gas to a space between the first and second electrodes, respectively, a first supply path for first gas connected to the first part, and a second supply path for second gas connected to the second part. The substrate comprises a heater for the first gas, a first introducing path for introducing the first gas to the first supply path, and a second introducing path for introducing the second gas to the second supply path. The second supply path comprises a mainstream part without the second part and branch parts with the second part. A connecting portion of the second introducing path and the mainstream part is positioned in an adjacent portion of the plates.
    Type: Grant
    Filed: November 22, 2010
    Date of Patent: December 8, 2015
    Assignee: KYOCERA Corporation
    Inventors: Norikazu Ito, Koichiro Niira, Shinichiro Inaba
  • Patent number: 9112088
    Abstract: Disclosed is a method for manufacturing a thin-film solar cell using plasma between a couple of parallel electrodes. In the method, a base member is placed in a chamber between a first electrode and a second electrode facing each other. A hydrogen gas is heated, and thus heated hydrogen gas and a silicon-based gas are introduced into a space between the first electrode and the second electrode. A ratio of a flow rate of the heated hydrogen gas to that of the silicon-based gas is at least 25 and no more than 58. A plasma is generated between the first electrode and the second electrode by applying high-frequency power to the second electrode while a pressure in the chamber is 1000 Pa or higher, and an optically active layer containing crystalline silicon is deposited on the base material.
    Type: Grant
    Filed: April 22, 2011
    Date of Patent: August 18, 2015
    Assignee: KYOCERA Corporation
    Inventors: Koichiro Niira, Norikazu Ito, Shinichiro Inaba
  • Publication number: 20150075605
    Abstract: This solar cell element, which is increased in the conversion efficiency due to improved effect of passivation, includes a semiconductor substrate in which a p-type first semiconductor region and an n-type second semiconductor region are stacked such that the first semiconductor region is located nearmost a first principal surface side and the second semiconductor region is located nearmost a second principal surface side; and a first passivation film containing aluminum oxide and arranged on the first principal surface side of the first semiconductor region. In the inside of the first passivation film of the solar cell element, the first ratio obtained by dividing the aluminum atomic density by the oxygen atomic density is 0.613 or more and less than 0.667 and the second ratio obtained by dividing the sum of the aluminum atomic density and the hydrogen atomic density by the oxygen atomic density is 0.667 or more and less than 0.786.
    Type: Application
    Filed: March 28, 2013
    Publication date: March 19, 2015
    Inventors: Kouji Miyamoto, Shigeo Aono, Tomofumi Honjo, Shiro Miyazaki, Masahiro Tanaka, Koichiro Niira, Kenichi Kurobe
  • Patent number: 8975506
    Abstract: A surface electrode (5) is installed on the light receiving surface of a solar cell element, the surface electrode (5) comprises three bus bar electrodes (5a) for extracting light-produced at the solar cell element to the outside and collecting finger electrodes (5b) connected to these bus bar electrodes (5a), and the bus bar electrodes (5a) are not less than 0.5 mm and not more than 2 mm in width and the finger electrodes (5b) are not less than 0.05 mm and not more than 0.1 mm in width. A high-efficient solar cell module can be obtained with substantially lowered resistance by increasing the number of bus bar electrode (5a) and thereby decreasing the lengths of the finger electrodes (5b).
    Type: Grant
    Filed: October 13, 2011
    Date of Patent: March 10, 2015
    Assignee: KYOCERA Corporation
    Inventors: Shuichi Fujii, Yosuke Inomata, Tomonari Sakamoto, Koichiro Niira, Yuko Fukawa, Hiroshi Morita, Koji Nishi, Tatsuya Yashiki, Mitsuo Yamashita, Kenji Fukui
  • Patent number: 8941160
    Abstract: A photoelectric conversion module according to an embodiment of the present invention includes a plurality of units formed on a substrate and disposed parallel to each other, each including a plurality of photoelectric conversion cells formed in one direction, the plurality of units disposed in an orthogonal direction to the one direction, and a first separation region disposed between adjacent units of the units. In the solar cell module, each of the photoelectric conversion cells includes a second separation region, and the second separation region in one of the units is extended beyond the first separation region formed between one of the units and the other unit which is adjacent to the one of units toward a part of the other unit.
    Type: Grant
    Filed: February 26, 2010
    Date of Patent: January 27, 2015
    Assignee: KYOCERA Corporation
    Inventor: Koichiro Niira
  • Publication number: 20140209152
    Abstract: A surface electrode (5) is installed on the light receiving surface of a solar cell element, the surface electrode (5) comprises three bus bar electrodes (5a) for extracting light-produced at the solar cell element to the outside and collecting finger electrodes (5b) connected to these bus bar electrodes (5a), and the bus bar electrodes (5a) are not less than 0.5 mm and not more than 2 mm in width and the finger electrodes (5b) are not less than 0.05 mm and not more than 0.1 mm in width. A high-efficient solar cell module can be obtained with substantially lowered resistance by increasing the number of bus bar electrode (5a) and thereby decreasing the lengths of the finger electrodes (5b).
    Type: Application
    Filed: March 28, 2014
    Publication date: July 31, 2014
    Applicant: KYOCERA CORPORATION
    Inventors: Shuichi FUJII, Yosuke INOMATA, Tomonari SAKAMOTO, Koichiro NIIRA, Yuko FUKAWA, Hiroshi MORITA, Koji NISHI, Tatsuya YASHIKI, Mitsuo YAMASHITA, Kenji FUKUI
  • Patent number: 8703586
    Abstract: In order to form a high quality film without causing in-plane nonuniformity in film quality, an apparatus for forming deposited film according to an aspect of the present invention includes: a chamber; a first electrode located in the chamber; a second electrode that is located in the chamber with a predetermined spacing from the first electrode and includes a plurality of supply parts configured to supply material gases; an introduction path connected to the supply parts, through which the material gases are introduced; a heater located in the introduction path; and a cooling mechanism configured to cool the second electrode.
    Type: Grant
    Filed: September 24, 2010
    Date of Patent: April 22, 2014
    Assignee: KYOCERA Corporation
    Inventors: Norikazu Ito, Shinichiro Inaba, Hiroshi Matsui, Koichiro Niira
  • Patent number: 8455754
    Abstract: A solar cell element and method of manufacturing same is disclosed. A reverse-conductive-type layer is formed on at least one part of a first surface side of a one-conductive-type semiconductor substrate. A conductive layer is formed on the reverse-conductive-type layer. A contact region for electrically connecting the conductive layer and the one-conductive-type semiconductor substrate is formed by heating and melting at least one part of the conductive layer. The solar cell element can be manufactured without conducting complicated treatments, such as removal by etching and re-growing of a silicon thin layer.
    Type: Grant
    Filed: April 27, 2009
    Date of Patent: June 4, 2013
    Assignee: KYOCERA Corporation
    Inventors: Koichiro Niira, Manabu Komoda
  • Publication number: 20130040414
    Abstract: Disclosed is a method for manufacturing a thin-film solar cell using plasma between a couple of parallel electrodes. In the method, a base member is placed in a chamber between a first electrode and a second electrode facing each other. A hydrogen gas is heated, and thus heated hydrogen gas and a silicon-based gas are introduced into a space between the first electrode and the second electrode. A ratio of a flow rate of the heated hydrogen gas to that of the silicon-based gas is at least 25 and no more than 58. A plasma is generated between the first electrode and the second electrode by applying high-frequency power to the second electrode while a pressure in the chamber is 1000 Pa or higher, and an optically active layer containing crystalline silicon is deposited on the base material.
    Type: Application
    Filed: April 22, 2011
    Publication date: February 14, 2013
    Applicant: KYOCERA CORPORATION
    Inventors: Koichiro Niira, Norikazu Ito, Shinichiro Inaba
  • Publication number: 20120260964
    Abstract: A surface electrode (5) is installed on the light receiving surface of a solar cell element, the surface electrode (5) comprises three bus bar electrodes (5a) for extracting light-produced at the solar cell element to the outside and collecting finger electrodes (5b) connected to these bus bar electrodes (5a), and the bus bar electrodes (5a) are not less than 0.5 mm and not more than 2 mm in width and the finger electrodes (5b) are not less than 0.05 mm and not more than 0.1 mm in width. A high-efficient solar cell module can be obtained with substantially lowered resistance by increasing the number of bus bar electrode (5a) and thereby decreasing the lengths of the finger electrodes (5b).
    Type: Application
    Filed: October 13, 2011
    Publication date: October 18, 2012
    Applicant: KYOCERA CORPORATION
    Inventors: Shuichi FUJII, Yosuke INOMATA, Tomonari SAKAMOTO, Koichiro NIIRA, Yuko FUKAWA, Hiroshi MORITA, Koji NISHI, Tatsuya YASHIKI, Mitsuo YAMASHITA, Kenji FUKUI
  • Publication number: 20120235268
    Abstract: A photoelectric conversion module comprises: a substrate having a first surface on which a light is incident and a second surface located at the opposite side of the first surface; a photoelectric conversion element provided on the second surface of the substrate; a light-transmitting member provided on the photoelectric conversion element; and a reflecting member provided on the light-transmitting member and configured to reflect a light having transmitted through the light-transmitting member. The reflecting member comprises an inclined light reflection surface that allows a light reflected from the reflecting member to be totally reflected at the first surface of the substrate.
    Type: Application
    Filed: November 30, 2010
    Publication date: September 20, 2012
    Applicant: KYOCERA Corporation
    Inventors: Koichiro Niira, Norikazu Ito, Hiroki Okui, Shinichiro Inaba
  • Publication number: 20120228129
    Abstract: First and second electrodes are apart from each other in a chamber. Plates are disposed on a substrate in the second electrode. Each of the plates comprises first and second parts for supplying first and second gas to a space between the first and second electrodes, respectively, a first supply path for first gas connected to the first part, and a second supply path for second gas connected to the second part. The substrate comprises a heater for the first gas, a first introducing path for introducing the first gas to the first supply path, and a second introducing path for introducing the second gas to the second supply path. The second supply path comprises a mainstream part without the second part and branch parts with the second part. A connecting portion of the second introducing path and the mainstream part is positioned in an adjacent portion of the plates.
    Type: Application
    Filed: November 22, 2010
    Publication date: September 13, 2012
    Applicant: KYOCERA CORPORATION
    Inventors: Norikazu Ito, Koichiro Niira, Shinichiro Inaba
  • Publication number: 20120171849
    Abstract: In order to form a high quality film without causing in-plane nonuniformity in film quality, an apparatus for forming deposited film according to an aspect of the present invention includes: a chamber; a first electrode located in the chamber; a second electrode that is located in the chamber with a predetermined spacing from the first electrode and includes a plurality of supply parts configured to supply material gases; an introduction path connected to the supply parts, through which the material gases are introduced; a heater located in the introduction path; and a cooling mechanism configured to cool the second electrode.
    Type: Application
    Filed: September 24, 2010
    Publication date: July 5, 2012
    Applicant: KYOCERA CORPORATION
    Inventors: Norikazu Ito, Shinichiro Inaba, Hiroshi Matsui, Koichiro Niira
  • Patent number: 8178778
    Abstract: A photovoltaic conversion element includes a one conductivity-type crystalline Si semiconductor; an opposite conductivity-type semiconductor which is joined to the crystalline Si semiconductor to form a pn junction therebetween; an electrode provided on the opposite conductivity-type semiconductor; and a depletion region formed from the side of the one conductivity-type crystalline Si semiconductor to the side of the opposite conductivity-type semiconductor across the pn junction formed therebetween. The depletion region has a first depletion region located inside the crystalline Si semiconductor and under the electrode, and the first depletion region has an oxygen concentration of 1E18 [atoms/cm3] or less.
    Type: Grant
    Filed: March 24, 2006
    Date of Patent: May 15, 2012
    Assignee: Kyocera Corporation
    Inventors: Koichiro Niira, Tomonari Sakamoto, Norihiko Matsushima
  • Publication number: 20110304002
    Abstract: A photoelectric conversion module according to an embodiment of the present invention includes a plurality of units formed on a substrate and disposed parallel to each other, each including a plurality of photoelectric conversion cells formed in one direction, the plurality of units disposed in an orthogonal direction to the one direction, and a first separation region disposed between adjacent units of the units. In the solar cell module, each of the photoelectric conversion cells includes a second separation region, and the second separation region in one of the units is extended beyond the first separation region formed between one of the units and the other unit which is adjacent to the one of units toward a part of the other unit.
    Type: Application
    Filed: February 26, 2010
    Publication date: December 15, 2011
    Applicant: KYOCERA CORPORATION
    Inventor: Koichiro Niira
  • Publication number: 20110254116
    Abstract: A photoelectric conversion module X1 comprises a photoelectric conversion element D1 and a protective member 9. The photoelectric conversion element D1 comprises a photoelectric conversion layer with a first main surface, and a light-transmitting conductive layer 6 located on the first main surface. The protective member 9 on the light-transmitting conductive layer 6 comprising an ethylene vinyl acetate resin and an acid acceptor.
    Type: Application
    Filed: December 26, 2009
    Publication date: October 20, 2011
    Applicant: KYOCERA CORPORATION
    Inventors: Norihiko Matsuhima, Masato Suziki, Koichiro Niira
  • Publication number: 20110135843
    Abstract: In order to form a high-quality Si-based film at high speed, for example, a deposited film forming device according to one aspect of the present invention includes: a chamber; a first electrode arranged in the chamber; and a second electrode arranged in the chamber and spaced a certain distance from the first electrode. The second electrode includes first and second supplying parts. The first supplying part supplies a first material gas and generates hollow cathode discharge. The second supplying part supplies a second material gas higher in decomposition rate than the first material gas.
    Type: Application
    Filed: July 29, 2009
    Publication date: June 9, 2011
    Applicant: KYOCERA CORPORATION
    Inventors: Koichiro Niira, Norikazu Ito, Sinichiro Inaba, Hiroshi Matsui
  • 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