KR20080094021A - 색소 증감형 광전 변환장치 - Google Patents

색소 증감형 광전 변환장치 Download PDF

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Publication number
KR20080094021A
KR20080094021A KR1020087018998A KR20087018998A KR20080094021A KR 20080094021 A KR20080094021 A KR 20080094021A KR 1020087018998 A KR1020087018998 A KR 1020087018998A KR 20087018998 A KR20087018998 A KR 20087018998A KR 20080094021 A KR20080094021 A KR 20080094021A
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KR
South Korea
Prior art keywords
dye
semiconductor layer
photoelectric conversion
sensitized photoelectric
dyes
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Withdrawn
Application number
KR1020087018998A
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English (en)
Korean (ko)
Inventor
레이코 요네야
유스케 스즈키
마사히로 모로오카
Original Assignee
소니 가부시끼 가이샤
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Publication of KR20080094021A publication Critical patent/KR20080094021A/ko
Withdrawn legal-status Critical Current

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01GCAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/20Light-sensitive devices
    • H01G9/2059Light-sensitive devices comprising an organic dye as the active light absorbing material, e.g. adsorbed on an electrode or dissolved in solution
    • H01G9/2063Light-sensitive devices comprising an organic dye as the active light absorbing material, e.g. adsorbed on an electrode or dissolved in solution comprising a mixture of two or more dyes
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10FINORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F10/00Individual photovoltaic cells, e.g. solar cells
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M14/00Electrochemical current or voltage generators not provided for in groups H01M6/00 - H01M12/00; Manufacture thereof
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01GCAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/20Light-sensitive devices
    • H01G9/2027Light-sensitive devices comprising an oxide semiconductor electrode
    • H01G9/2031Light-sensitive devices comprising an oxide semiconductor electrode comprising titanium oxide, e.g. TiO2
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/30Coordination compounds
    • H10K85/341Transition metal complexes, e.g. Ru(II)polypyridine complexes
    • H10K85/344Transition metal complexes, e.g. Ru(II)polypyridine complexes comprising ruthenium
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60Organic compounds having low molecular weight
    • H10K85/649Aromatic compounds comprising a hetero atom
    • H10K85/652Cyanine dyes
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60Organic compounds having low molecular weight
    • H10K85/649Aromatic compounds comprising a hetero atom
    • H10K85/657Polycyclic condensed heteroaromatic hydrocarbons
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60Organic compounds having low molecular weight
    • H10K85/649Aromatic compounds comprising a hetero atom
    • H10K85/657Polycyclic condensed heteroaromatic hydrocarbons
    • H10K85/6572Polycyclic condensed heteroaromatic hydrocarbons comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/542Dye sensitized solar cells

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Hybrid Cells (AREA)
  • Photovoltaic Devices (AREA)
KR1020087018998A 2006-02-02 2007-01-31 색소 증감형 광전 변환장치 Withdrawn KR20080094021A (ko)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2006025275 2006-02-02
JPJP-P-2006-00025275 2006-02-02
JPJP-P-2006-00348822 2006-12-26
JP2006348822A JP2007234580A (ja) 2006-02-02 2006-12-26 色素増感型光電変換装置

Publications (1)

Publication Number Publication Date
KR20080094021A true KR20080094021A (ko) 2008-10-22

Family

ID=38327442

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020087018998A Withdrawn KR20080094021A (ko) 2006-02-02 2007-01-31 색소 증감형 광전 변환장치

Country Status (7)

Country Link
US (1) US8415558B2 (https=)
EP (1) EP1981118A4 (https=)
JP (1) JP2007234580A (https=)
KR (1) KR20080094021A (https=)
CN (1) CN101937778B (https=)
TW (1) TW200746491A (https=)
WO (1) WO2007088871A1 (https=)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101042096B1 (ko) * 2009-10-06 2011-06-16 영남대학교 산학협력단 염료감응형 태양전지 및 염료감응형 태양전지용 이산화티타늄-카본나노튜브 페이스트 제조방법
KR101132032B1 (ko) * 2010-08-11 2012-04-02 삼성에스디아이 주식회사 광전 변환 소자용 전극, 이의 제조 방법 및 이를 포함하는 광전 변환 소자

Families Citing this family (45)

* Cited by examiner, † Cited by third party
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JP5162822B2 (ja) * 2005-12-02 2013-03-13 ソニー株式会社 電気化学デバイス
JP5007784B2 (ja) * 2006-01-30 2012-08-22 ソニー株式会社 光電変換装置
JP2007280906A (ja) * 2006-04-12 2007-10-25 Sony Corp 機能デバイス及びその製造方法
JP5245108B2 (ja) * 2007-07-11 2013-07-24 ソニー株式会社 マグネシウムイオン含有非水電解液及びその製造方法、並びに電気化学デバイス
JP5023866B2 (ja) * 2007-07-27 2012-09-12 ソニー株式会社 色素増感光電変換素子およびその製造方法ならびに電子機器
JP5034799B2 (ja) * 2007-09-07 2012-09-26 ソニー株式会社 マグネシウムイオン含有非水電解液及びその製造方法、並びに電気化学デバイス
JP5320710B2 (ja) * 2007-09-07 2013-10-23 ソニー株式会社 正極活物質及びその製造方法、並びに電気化学デバイス
JP2009099476A (ja) * 2007-10-19 2009-05-07 Sony Corp 色素増感光電変換素子およびその製造方法
JP2009146625A (ja) * 2007-12-12 2009-07-02 Sony Corp 色素増感光電変換素子モジュールおよびその製造方法ならびに光電変換素子モジュールおよびその製造方法ならびに電子機器
JP5285062B2 (ja) * 2008-03-19 2013-09-11 シャープ株式会社 光増感素子及びそれを用いた太陽電池
JP5159877B2 (ja) * 2008-04-25 2013-03-13 京セラ株式会社 光電変換装置および光発電装置
JP5298654B2 (ja) * 2008-06-16 2013-09-25 アイシン精機株式会社 光電極、及び、これを備える色素増感型太陽電池の製造方法、並びに、色素増感型太陽電池
JP2010003468A (ja) * 2008-06-19 2010-01-07 Sony Corp 色素増感太陽電池およびその製造方法
JP2010010191A (ja) * 2008-06-24 2010-01-14 Sony Corp 電子装置
JP2010009769A (ja) * 2008-06-24 2010-01-14 Sony Corp 光電変換素子の製造方法
JP2010092762A (ja) * 2008-10-09 2010-04-22 Sony Corp 機能性デバイス及びその製造方法
CN101735639A (zh) 2008-11-14 2010-06-16 明德国际仓储贸易(上海)有限公司 染料化合物及用此染料化合物制作的光电组件
TWI470034B (zh) * 2008-11-19 2015-01-21 Everlight Chem Ind Corp 染料化合物及用此染料化合物製作之光電元件
US20110048525A1 (en) * 2008-11-26 2011-03-03 Sony Corporation Functional device and method for producing the same
EP2221842A3 (en) * 2009-02-06 2010-12-15 University Of Wales, Bangor Dye-sensitised solar cells
JP5444747B2 (ja) * 2009-02-17 2014-03-19 ソニー株式会社 カラー撮像素子およびその製造方法ならびに光センサーおよびその製造方法ならびに光電変換素子およびその製造方法ならびに電子機器
CN102460822B (zh) * 2009-04-30 2015-04-15 株式会社普利司通 半导体电极、使用半导体电极的太阳能电池、及半导体电极的制造方法
JP5711470B2 (ja) * 2009-05-22 2015-04-30 パナソニック株式会社 光吸収材料及び光電変換素子
JP5428555B2 (ja) * 2009-06-08 2014-02-26 ソニー株式会社 色素増感光電変換素子の製造方法
GB0916037D0 (en) * 2009-09-11 2009-10-28 Isis Innovation Device
TW201116593A (en) * 2009-11-05 2011-05-16 Everlight Chem Ind Corp Dye-sensitized solar cell and photoanode thereof
FR2956208B1 (fr) * 2010-02-05 2012-04-27 Centre Nat Rech Scient Methode de determination sans contact de caracteristiques d'un photoconvertisseur
US20110214730A1 (en) * 2010-03-04 2011-09-08 Casio Computer Co., Ltd. Dye-sensitized solar cell
JP2011204662A (ja) * 2010-03-05 2011-10-13 Sony Corp 光電変換素子およびその製造方法ならびに電子機器
JP5621488B2 (ja) * 2010-03-17 2014-11-12 ソニー株式会社 光電変換装置
TWI412142B (zh) * 2010-03-29 2013-10-11 Univ Nat Sun Yat Sen 具金屬反光層之光電極及其染料敏化太陽能電池結構
US20120097238A1 (en) * 2010-10-25 2012-04-26 Isaacs-Sodeye Akinbode I Graphene-based solar cell
EP2683019B1 (en) * 2011-03-02 2015-08-19 Fujikura Ltd. Dye-sensitized solar cell for low light intensities
JP5626079B2 (ja) * 2011-03-31 2014-11-19 コニカミノルタ株式会社 色素増感太陽電池およびその製造方法
JP5263458B1 (ja) * 2011-07-29 2013-08-14 凸版印刷株式会社 色素増感太陽電池
WO2013066453A1 (en) * 2011-08-02 2013-05-10 University Of Southern California Compounds capable of undergoing symmetry breaking intramolecular charge transfer in a polarizing medium and organic photovoltaic devices comprising the same
JP2014007053A (ja) * 2012-06-25 2014-01-16 Ricoh Co Ltd 機能性デバイスおよびその製造方法
JP2014067650A (ja) * 2012-09-27 2014-04-17 Hitachi Zosen Corp 色素増感太陽電池の製造方法
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Family Cites Families (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH674596A5 (https=) 1988-02-12 1990-06-15 Sulzer Ag
JP3505414B2 (ja) * 1998-12-24 2004-03-08 株式会社東芝 光化学電池およびその製造法
JP2000268892A (ja) * 1999-01-14 2000-09-29 Fuji Photo Film Co Ltd 光電変換素子および光電池
EP1020881A3 (en) * 1999-01-14 2004-10-20 Fuji Photo Film Co., Ltd. Photo-electrochemical cell
US6359211B1 (en) * 1999-06-17 2002-03-19 Chemmotif, Inc. Spectral sensitization of nanocrystalline solar cells
CA2417502C (en) * 2000-07-27 2012-01-10 Nippon Kayaku Kabushiki Kaisha Dye-sensitized photoelectric conversion device
EP1422782B1 (en) * 2001-07-06 2011-01-12 Nippon Kayaku Kabushiki Kaisha Photoelectric conversion element sensitized with methine dyes
JP5051810B2 (ja) * 2001-08-17 2012-10-17 日本化薬株式会社 色素増感光電変換素子
JP4822383B2 (ja) 2001-09-07 2011-11-24 日本化薬株式会社 色素増感光電変換素子
JP4230228B2 (ja) * 2002-01-16 2009-02-25 日本化薬株式会社 色素増感光電変換素子
JP4010170B2 (ja) * 2002-04-11 2007-11-21 ソニー株式会社 光電変換素子の製造方法
JP4221643B2 (ja) * 2002-05-27 2009-02-12 ソニー株式会社 光電変換装置
JP4266573B2 (ja) * 2002-06-04 2009-05-20 日本化薬株式会社 色素増感光電変換素子
JP4274306B2 (ja) 2002-06-13 2009-06-03 日本化薬株式会社 色素増感光電変換素子
JP2004022387A (ja) 2002-06-18 2004-01-22 Nippon Kayaku Co Ltd 色素増感光電変換素子
JP4168728B2 (ja) 2002-10-23 2008-10-22 セイコーエプソン株式会社 液滴吐出装置のドット位置補正方法、液滴吐出方法および電気光学装置の製造方法
JP4839573B2 (ja) * 2004-02-13 2011-12-21 ソニー株式会社 電気化学デバイス及び電極
JP4382608B2 (ja) * 2004-03-15 2009-12-16 住友大阪セメント株式会社 色素増感型太陽電池
JP4635473B2 (ja) * 2004-05-13 2011-02-23 ソニー株式会社 光電変換素子の製造方法及び半導体電極の製造方法
JP4635474B2 (ja) * 2004-05-14 2011-02-23 ソニー株式会社 光電変換素子、及びこれに用いる透明導電性基板
JP5096673B2 (ja) * 2004-11-30 2012-12-12 三菱製紙株式会社 半導体電極および光電変換素子
EP1672653B1 (en) * 2004-12-20 2019-07-17 Merck Patent GmbH Patterned photovoltaic cell
JP5162822B2 (ja) * 2005-12-02 2013-03-13 ソニー株式会社 電気化学デバイス
JP5007784B2 (ja) * 2006-01-30 2012-08-22 ソニー株式会社 光電変換装置
JP2007280906A (ja) * 2006-04-12 2007-10-25 Sony Corp 機能デバイス及びその製造方法
JP5245108B2 (ja) * 2007-07-11 2013-07-24 ソニー株式会社 マグネシウムイオン含有非水電解液及びその製造方法、並びに電気化学デバイス
JP5023866B2 (ja) * 2007-07-27 2012-09-12 ソニー株式会社 色素増感光電変換素子およびその製造方法ならびに電子機器
JP5034799B2 (ja) * 2007-09-07 2012-09-26 ソニー株式会社 マグネシウムイオン含有非水電解液及びその製造方法、並びに電気化学デバイス
JP5320710B2 (ja) * 2007-09-07 2013-10-23 ソニー株式会社 正極活物質及びその製造方法、並びに電気化学デバイス
JP2009099476A (ja) * 2007-10-19 2009-05-07 Sony Corp 色素増感光電変換素子およびその製造方法
JP2009110796A (ja) * 2007-10-30 2009-05-21 Sony Corp 色素増感光電変換素子モジュールおよびその製造方法ならびに電子機器
JP2009146625A (ja) * 2007-12-12 2009-07-02 Sony Corp 色素増感光電変換素子モジュールおよびその製造方法ならびに光電変換素子モジュールおよびその製造方法ならびに電子機器
JP2010003468A (ja) * 2008-06-19 2010-01-07 Sony Corp 色素増感太陽電池およびその製造方法
JP2010010191A (ja) * 2008-06-24 2010-01-14 Sony Corp 電子装置
JP2010009769A (ja) * 2008-06-24 2010-01-14 Sony Corp 光電変換素子の製造方法
JP2010092762A (ja) * 2008-10-09 2010-04-22 Sony Corp 機能性デバイス及びその製造方法
US20110048525A1 (en) * 2008-11-26 2011-03-03 Sony Corporation Functional device and method for producing the same
JP5428555B2 (ja) * 2009-06-08 2014-02-26 ソニー株式会社 色素増感光電変換素子の製造方法
JP2011204662A (ja) * 2010-03-05 2011-10-13 Sony Corp 光電変換素子およびその製造方法ならびに電子機器
JP5621488B2 (ja) * 2010-03-17 2014-11-12 ソニー株式会社 光電変換装置
JP2011216190A (ja) * 2010-03-31 2011-10-27 Sony Corp 光電変換装置及びその製造方法
JP2011216189A (ja) * 2010-03-31 2011-10-27 Sony Corp 光電変換装置及び光電変換装置モジュール
JP2011238472A (ja) * 2010-05-11 2011-11-24 Sony Corp 光電変換装置
JP2011236104A (ja) * 2010-05-13 2011-11-24 Sony Corp 酸化チタン構造体及びその製造方法、並びに酸化チタン構造体を用いた光電変換装置
JP2012014849A (ja) * 2010-06-29 2012-01-19 Sony Corp 光電変換素子およびその製造方法ならびに光電変換素子モジュールおよびその製造方法

Cited By (2)

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KR101042096B1 (ko) * 2009-10-06 2011-06-16 영남대학교 산학협력단 염료감응형 태양전지 및 염료감응형 태양전지용 이산화티타늄-카본나노튜브 페이스트 제조방법
KR101132032B1 (ko) * 2010-08-11 2012-04-02 삼성에스디아이 주식회사 광전 변환 소자용 전극, 이의 제조 방법 및 이를 포함하는 광전 변환 소자

Also Published As

Publication number Publication date
CN101937778B (zh) 2013-05-01
JP2007234580A (ja) 2007-09-13
EP1981118A1 (en) 2008-10-15
US20090217979A1 (en) 2009-09-03
WO2007088871A1 (ja) 2007-08-09
TW200746491A (en) 2007-12-16
US8415558B2 (en) 2013-04-09
EP1981118A4 (en) 2014-08-27
CN101937778A (zh) 2011-01-05

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