多重励起子生成と表面プラズモン効果による光励起キャリアダイナミクスと光電変換特性

• Project Area: Strong Photons-Molecules Coupling Fields for Chemical Reactions
• Project/Area Number: 21020014
• Research Category: Grant-in-Aid for Scientific Research on Priority Areas
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: The University of Electro-Communications
• Principal Investigator: 豊田 太郎 電気通信大学, 大学院・情報理工学研究科, 教授 (40217576)
• Co-Investigator(Kenkyū-buntansha): 沈 青 電気通信大学, 大学院・情報理工学研究科, 助教 (50282926)
• Project Period (FY): 2009 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥3,700,000 (Direct Cost: ¥3,700,000); Fiscal Year 2010: ¥1,800,000 (Direct Cost: ¥1,800,000); Fiscal Year 2009: ¥1,900,000 (Direct Cost: ¥1,900,000)
• Keywords: 半導体量子ドット / 金属量子ドット / 多重励起子生成 / プラズモン効果 / 過渡応答特性 / 増感太陽電池

Research Abstract

近年Au量子ドットを吸着したTiO_2電極において、プラズモン共鳴に基づく光誘起電荷分離が発見されたため、新しい増感太陽電池への応用が注目されている。一方半導体量子ドットが多重励起子生成(MEG)を示すことから、従来の色素増感に代わる半導体量子ドット増感太陽電池が注目されている。本研究はAu量子ドットによる光局在場のMEG生成に与える効果について検討し、MEG生成増大条件を見出し半導体量子ドット増感太陽電池の光電変換向上を目的としている。半導体量子ドットとしてCdSeを、金属量子ドットとしてAuを対象とし、ナノ粒子TiO_2電極への複合化吸着を行った。この系に対して、光吸収特性評価、光電流特性評価を行った。その結果、CdSe量子ドットの平均粒径は作製吸着時間とともに増大し、光電流はある吸着時間で極大を示した。さらに太陽電池デバイスを形成し、光電変換特性評価を行った。その結果、開放電圧と曲線因子は、CdSe量子ドット単独吸着の場合もAu/CdSe複合化吸着も大きな違いは見られなかった。しかし短絡電流はCdSe量子ドットの吸着時間が短時間の場合には、複合化吸着では単独吸着に比べて約30%程増大することが見出された。この結果を反映して、光電変換効率も同様の増大と変化を示した。また太陽電池デバイスにおける並列抵抗成分は、複合吸着の場合に減少することがわかった。これはCdSe量子ドットとAu量子ドットの直接接触による影響と考えられる。他の評価として、単独吸着の場合と複合化吸着の場合の超高速過渡応答特性の検討を行った。その結果、複合化吸着の場合は単独吸着の場合と比較して、緩和時間が長くなる傾向が見られた。

Research Products

• [Journal Article] Low-cost flexible nano-sulfide/carbon composite counter electrode for quantum-dot-sensitized solar cell (2010)
  • Author(s): M.Deng, Q.Zhang, S.Huang, D.Li, Y.Luo, Q.Shen, T.Toyoda, Q.Meng
  • Journal Title: Nanoscale Research Letters Volume: 5 Pages: 986-990
  • Peer Reviewed
• [Journal Article] CdSe quantum dot-sensitized solar cell employing TiO_2 nanotube working-electrode and Cu_2S counter-electrode (2010)
  • Author(s): Q.Shen, A.Yamada, S.Tamura, T.Toyoda
  • Journal Title: Applied Physics Letters Volume: 97 Pages: 123107-123107
  • Peer Reviewed
• [Journal Article] Highly efficient quasi-solid-state quantum-dot-sensitized solar cell based on hydrogel electrolyte (2010)
  • Author(s): Z.Yu, Q.Zhang, D.Qin, Y.Luo, D.Li, Q.Shen, T.Toyoda, Q.Meng
  • Journal Title: Electrochemical Communications Volume: 12 Pages: 1776-1779
  • Peer Reviewed
• [Journal Article] Photoacoustic and photoelectrochemical current spctra of combined CdS/CdSe quantum dots adsorbed on nanostructured TiO_2 electrodes, together with photovoltaic characteristics (2010)
  • Author(s): T.Toyoda, K.Oshikane, D.M.Li, Y.H.Luo, Q.B.Meng, Q.Shen
  • Journal Title: Journal of Applied Physics Volume: 108 Pages: 114304-114304
  • Peer Reviewed
• [Journal Article] Fobrous CdS/CdSe quantum dot co-sensitized solar cells based on ordered TiO_2 nanotube arrays (2010)
  • Author(s): S.Q.Huang, Q.X.Zhang, X.M.Huang, X.Z.Guo, M.H.Deng, D.M.Li, Y.H.Luo, Q.Shen, T.Toyoda, Q.B.Meng
  • Journal Title: Nanotechnology Volume: 21 Pages: 375201-375201
  • Peer Reviewed
• [Journal Article] Sensitization of titanium dioxide photoanodes with cadmium selenide quantum dots prepared by SILAR : Photoelectrochemical and carrier dynamics studies (2010)
  • Author(s): N.Guijarro, T.Lana-Villarreal, Q.Shen, T.Toyoda, R.Gomez
  • Journal Title: Journal of Physical Chemistry C Volume: 114 Pages: 21928-21937
  • Peer Reviewed
• [Journal Article] Direct correlation between ultrafast injection and photoanode performance in quantum-dot sensitized solar cells (2010)
  • Author(s): N.Guijarro, Q.Shen, S.Gimenez, I.Mora-Sero, J.Bisquert, T.Lana-Villarreal, T.Toyoda, R.Gomez
  • Journal Title: Journal of Physical Chemistry C Volume: 114 Pages: 22352-22360
  • Peer Reviewed
• [Journal Article] Scree-printed Cu_2S-based counter electrode for quantum-dot-sensitized solar cell (2010)
  • Author(s): M.H.Deng, S.Q.Huang, Q.X.Zhang, D.M.Li, Y.H.Luo, Q.Shen, T.Toyoda, Q.B.Meng
  • Journal Title: Chemistry Letters Volume: 39 Pages: 1168-1170
  • Peer Reviewed
• [Journal Article] Ultrafast photoexcited electron and hole dynamics in CdSe quantum dots adsorbed onto nanostructured TiO_2 films (2010)
  • Author(s): Q.Shen, Y.Ayuzawa, K.Katayama, T.Sawada, T.Toyoda
  • Journal Title: Applied Physics Letters Volume: 97 Pages: 263113-263113
  • Peer Reviewed
• [Journal Article] Electric characteristics of Li_2O-doped TiO_2 nanocrystalline film and its application to dye-sensitized solar cells (2009)
  • Author(s): M.Nada, T.Gonda, Q.Shen, H.Shimada, T.Toyoda, N.Kobayashi
  • Journal Title: Japanese Journal of Applied Physics 48
  • Peer Reviewed
• [Journal Article] Photoacoustic spectra of Au quantum dots adsorbed on nanostructured TiO_2 electrodes together with the photoelectrochemical current characteristics (2009)
  • Author(s): T.Toyoda, S.Tsugawa, Q.Shen
  • Journal Title: Journal of Applied Physics 105
  • Peer Reviewed
• [Journal Article] Terahertz reflection response measurement using a phonon polariton wave (2009)
  • Author(s): H.Inoue, K.Katayama, Q.Shen, T.Toyoda, K.A.Nelson
  • Journal Title: Journal of Applied Physics 105
  • Peer Reviewed
• [Journal Article] Improving the performance of colloidal quantum-dot-sensitized solar cells (2009)
  • Author(s): S.Gimenez, I.Mora-Sero, L.Macor, N.Guijarro, T.Lana-Villarrealm R.Gomez, L.J.Diguna, Q.Shen, T.Toyoda, J.Bisquert
  • Journal Title: Nanotechnology 20
  • Peer Reviewed
• [Journal Article] Recombination in quantum dot sensitized solar cells (2009)
  • Author(s): I.Mora-Sero, S.Gimenez, F.Fabregat-Santiago, R.Gomez, Q.Shen, T.Toyoda, J.Bisquert
  • Journal Title: Accounts of Chemical Research 42 Pages: 1848-1857
  • Peer Reviewed
• [Presentation] 半導体量子ドットの光励起キャリアダイナミクスと光電変換特性 (2011)
  • Author(s): 豊田太郎、沈青
  • Organizer: 日本化学会第91春季年回
  • Place of Presentation: 神奈川大学(横浜、神奈川)
  • Year and Date: 2011-03-29
• [Presentation] 改良型過渡回折格子法によるPbS量子ドットの多重励起子生成評価 (2011)
  • Author(s): 沈青、片山健二、澤田嗣郎、豊田太郎
  • Organizer: 日本化学会第91春季年回
  • Place of Presentation: 神奈川大学(横浜、神奈川)
  • Year and Date: 2011-03-28
• [Presentation] 陽極化成法による自己組織化TiO_2ナノチューブ電極の光吸収と光電気化学特性 (2011)
  • Author(s): 太田朋佳、山田灯、沈青、豊田太郎
  • Organizer: 第58回応用物理学関係連合講演会
  • Place of Presentation: 神奈川工科大学(厚木、神奈川)
  • Year and Date: 2011-03-27
• [Presentation] ZnS表面保護のPbS量子ドット増感太陽電池に及ぼす影響 (2011)
  • Author(s): 八谷聡次郎、沈青、豊田太郎
  • Organizer: 日本化学会第91春季年回
  • Place of Presentation: 神奈川大学(横浜、神奈川)
  • Year and Date: 2011-03-27
• [Presentation] 二分子結合色素構造を有する色素増感太陽電池における段階的電子注入ダイナミクス (2011)
  • Author(s): 沈青、尾込裕平、B.Park、S.S.Pandey、宮本明理、藤田普介、豊田太郎、早瀬修二
  • Organizer: 第58回応用物理学関係連合講演会
  • Place of Presentation: 神奈川工科大学(厚木、神奈州)
  • Year and Date: 2011-03-24
• [Presentation] Characterization of optical properties of semiconductor quantum dot-sensitized solar cells together with ultrafast carrier dynamics (2011)
  • Author(s): T.Toyoda
  • Organizer: China-Japan Joint Discussion
  • Place of Presentation: Chinese Academy of Sciences (Beijing, China)
  • Year and Date: 2011-03-18
• [Presentation] Characterization of optical properties of semiconductor quantum dot-sensitized solar cells together with ultrafast carrier dynamics (2011)
  • Author(s): T.Toyoda
  • Organizer: Spain-Japan Cooperation Workshop on Quantum Dot Sensitizers
  • Place of Presentation: University of Jaume I (Castellon, Spain)
  • Year and Date: 2011-03-08
• [Presentation] Ultrafast photoexcited electron and hole dynamics in CdSe quantum dots adsorbed onto nanostructured TiO_2 films (2011)
  • Author(s): Q.Shen
  • Organizer: Spain-Japan Cooperation Workshop on Quantum Dot Sensitizers
  • Place of Presentation: University of Jaume I (Castellon, Spain)
  • Year and Date: 2011-03-08
• [Presentation] Improvement of the photovoltaic properties of PbS quantum dot-sensitized solar cells (2010)
  • Author(s): S.Hachiya, Q.Shen, T.Toyoda
  • Organizer: 2010 MRS Fall Meeting Symposium
  • Place of Presentation: Hynes Convention Center (Boston, USA)
  • Year and Date: 2010-11-30
• [Presentation] 多孔質ZnO薄膜の光音響スペクトルと光電流特性 (2010)
  • Author(s): 山田修三、細野英司、周豪慎、沈青、豊田太郎
  • Organizer: 第71回応用物理学会学術講演会
  • Place of Presentation: 長崎大学(長崎)
  • Year and Date: 2010-09-17
• [Presentation] CdS量子ドットを吸着した逆オパールTiO_2電極の光吸収と光電変換特性 (2010)
  • Author(s): 豊田太郎、大西陽平、沈青、押鐘敬太、鮎澤康正
  • Organizer: 第71回応用物理学会学術講演会
  • Place of Presentation: 長崎大学(長崎)
  • Year and Date: 2010-09-17
• [Presentation] 半導体量子ドットの光励起キャリアと光電変換特性 (2010)
  • Author(s): 豊田太郎、沈青
  • Organizer: 第59回高分子討論会
  • Place of Presentation: 北海道大学(札幌)
  • Year and Date: 2010-09-17
• [Presentation] 半導体量子ドットの分光増感と光電変換特性 (2010)
  • Author(s): 豊田太郎、沈青
  • Organizer: 光化学討論会2010
  • Place of Presentation: 千葉大学(千葉)
  • Year and Date: 2010-09-08
• [Presentation] Optical absorption and photovoltaic properties of CdS/CdSe quantum dot-sensitized solar cells (2010)
  • Author(s): T.Toyoda, K.Oshikane, D.Li, Y.Luo, Q.Meng, Q.Shen
  • Organizer: 18^<th> International Conference on Photochemical Conversion and Storage of Solar Energy
  • Place of Presentation: Korea University (Seoul, Korea)
  • Year and Date: 2010-07-28
• [Presentation] Semiconductor quantum dot-sensitized solar cells and photoexcited carrier dynamics (2010)
  • Author(s): T.Toyoda, Y.Ayuzawa, Q.Shen
  • Organizer: 18^<th> International Conference on Photochemical Conversion and Storage of Solar Energy
  • Place of Presentation: Korea University (Seoul, Korea)
  • Year and Date: 2010-07-28
• [Presentation] Semiconductor quantum dot sensitized solar cells and photoexcited carrier dynamics (2010)
  • Author(s): T.Toyoda, Y.Ayuzawa, Q.Shen
  • Organizer: 18^<th> International Conference on Photochemical Conversion and Storage of Solar Energy
  • Place of Presentation: Korea University (Seoul, Korea)
  • Year and Date: 2010-07-26
• [Presentation] CdSe quantum dot-sensitized solar cells based on TiO_2 nanotube (2010)
  • Author(s): A.Yamada, Q.Shen, T.Toyoda
  • Organizer: 18^<th> International Conference on Photochemical Conversion and Storage of Solar Energy
  • Place of Presentation: Korea University (Seoul, Korea)
  • Year and Date: 2010-07-26
• [Presentation] Application of carbon electrodes on CdS quantum dot-sensitized solar cells (2010)
  • Author(s): D.Li, Q.Zhang, Y.Luo, Q.Meng, Q.Shen, T.Toyoda
  • Organizer: 18^<th> International Conference on Photochemical Conversion and Storage of Solar Energy
  • Place of Presentation: Korea University (Seoul, Korea)
  • Year and Date: 2010-07-26
• [Presentation] Photocatalytic activity of nanostructured titanium dioxide films combined with fine particles of vanadate glass (2010)
  • Author(s): T.Toyoda, K.Miyazato, A.Morishige, Q.Shen
  • Organizer: 18^<th> International Conference on Photochemical Conversion and Storage of Solar Energy
  • Place of Presentation: Korea University (Seoul, Korea)
  • Year and Date: 2010-07-26
• [Presentation] Semiconductor quantum dot sensitized solar cells and photoexcited carrier dynamics (2010)
  • Author(s): T.Toyoda, Q.Shen
  • Organizer: NIMS Conference 2010
  • Place of Presentation: 物質・材料研究機構(筑波、茨城)
  • Year and Date: 2010-07-13
• [Presentation] Quantum dot sensitized-solar cells and ultrafast carrier dynamics (2010)
  • Author(s): T.Toyoda
  • Organizer: 5^<th> Forum on New materials
  • Place of Presentation: Plazzo del Congressi (Montecatini Thema, Italy)
  • Year and Date: 2010-06-15
• [Presentation] バナジン酸ガラス超微粒子を複合化したナノ構造TiO_2薄膜の光触媒特性 (2010)
  • Author(s): 宮里清大、森重明、沈青、豊田太郎
  • Organizer: 第57回応用物理学関係連合講演会
  • Place of Presentation: 東海大学(神奈川県)
  • Year and Date: 2010-03-17
• [Presentation] CdS量子ドットを吸着した逆オパール構造TiO_2電極の光音響スペクトル (2010)
  • Author(s): 大西陽平、押鐘敬太、鮎澤康正、沈青、豊田太郎
  • Organizer: 第57回応用物理学関係連合講演会
  • Place of Presentation: 東海大学(神奈川県)
  • Year and Date: 2010-03-17
• [Presentation] 多孔質ZnO薄膜の作製と光音響分光特性評価 (2010)
  • Author(s): 山田修三、細野英司、周豪慎、沈青、豊田太郎
  • Organizer: 第57回応用物理学関係連合講演会
  • Place of Presentation: 東海大学(神奈川県)
  • Year and Date: 2010-03-17
• [Presentation] 改良型ヘテロダイン過渡回折格子法による二酸化チタンナノ粒子薄膜の電子・熱拡散率評価 (2010)
  • Author(s): 秦啓晃、片山健二、沈青、豊田太郎
  • Organizer: 第57回応用物理学関係連合講演会
  • Place of Presentation: 東海大学(神奈川県)
  • Year and Date: 2010-03-17
• [Presentation] Effects of surface modification on the photovoltaic properties and the ultrafast carrier dynamics for CdSe QD sensitized solar cells (2010)
  • Author(s): Q.Shen, Y.Ayuzawa, K.Katayama, T.Sawada, T.Toyoda
  • Organizer: International Workshop on Semiconductor Sensitized Solar Cells
  • Place of Presentation: Mishkenot Sha'ananim International Cultural, Jerusalem, Israel
  • Year and Date: 2010-02-10
• [Presentation] Semiconductor quantum dot-sensitized solar cells (2010)
  • Author(s): 豊田太郎, 沈青
  • Organizer: International Workshop on Semiconductor Sensitized Solar Cells
  • Place of Presentation: Mishkenot Sha'ananim International Cultural, Jerusalem, Israel
  • Year and Date: 2010-02-08
• [Presentation] Photovoltaic properties and ultrafast carrier dynamics of semiconductor Quantum dot-sensitized solar cells (2009)
  • Author(s): 豊田太郎, 沈青
  • Organizer: 2009 Materials Research Society Fall Meeting
  • Place of Presentation: Hynes Convention Center, Massachusetts, USA
  • Year and Date: 2009-12-03
• [Presentation] 量子ドット増感太陽電池の開発と将来展望 (2009)
  • Author(s): 豊田太郎
  • Organizer: 第24回高分子エレクトロニクス研究会講座
  • Place of Presentation: 東京理科大学(東京都)
  • Year and Date: 2009-11-11
• [Presentation] Semiconductor quantum dot-sensitized solar cells using nanostructured TiO_2 electrodes with different morphologies (2009)
  • Author(s): T.Toyoda, Y.Yoshida, Y.Ayuzawa, Q.Shen
  • Organizer: The 14th International Conference on TiO_2 Photocatalysis : Fundamentals and Applications
  • Place of Presentation: Conference Center, Niagara Falls, New York, USA
  • Year and Date: 2009-10-06
• [Presentation] 陽極化成法により作製したTiO_2ナノチューブ電極の光応答特性 (2009)
  • Author(s): 山田灯、沈青、豊田太郎
  • Organizer: 第70回応用物理学会学術講演会
  • Place of Presentation: 富山大学(富山県)
  • Year and Date: 2009-09-09
• [Presentation] Photoacoustic and photoelectrochemical spectra of CdS/CdSe quantum dot-adsorbed nanostructured TiO_2 electrode (2009)
  • Author(s): 豊田太郎, 押鐘敬太, 沈青
  • Organizer: 15th International Conference on Photoacoustic and Photothermal Phenomena
  • Place of Presentation: Katholieke Universiteit Leuven, Leuven, Belgium
  • Year and Date: 2009-07-20
• [Presentation] Effect of rutile-type content in nanostructured anatase-type TiO_2 electrode with CdSe quantum dots on photoacoustic and photoelectrochemical spectra (2009)
  • Author(s): T.Toyoda, Y.Yoshida, Q.Shen
  • Organizer: 15th International Conference on Photoacoustic and Photothermal Phenomena
  • Place of Presentation: Katholieke Universiteit Leuven, Leuven, Belgium
  • Year and Date: 2009-07-20
• [Presentation] Photoexcited carrier dynamics of nanostructured TiO_2 films of different crystal structures together with CdSe quantum dots adsorption (2009)
  • Author(s): Q.Shen, K.Katayama, T.Sawada, T.Toyoda
  • Organizer: 15th International Conference on Photoacoustic and Photothermal Phenomena
  • Place of Presentation: Katholieke Universiteit Leuven, Leuven, Belgium
  • Year and Date: 2009-07-20
• [Presentation] Photoacoustic spectra of Au quantum dots adsorbed on nanostructured TiO_2 electrodes together with the photoelectrochemical current characteristics (2009)
  • Author(s): T.Toyoda, S.Tsugawa, Q.Shen
  • Organizer: 15th International Conference on Photoacoustic and Photothermal Phenomena
  • Place of Presentation: Katholieke Universiteit Leuven, Leuven, Belgium
  • Year and Date: 2009-07-20
• [Presentation] Photovoltaic and ultrafast carrier dynamic properties of CdSe quantum dot-sensitized solar cells using inverse opal TiO_2 electrodes (2009)
  • Author(s): T.Toyoda, L.J.Diguna, Q.Shen
  • Organizer: Hybrid and Organic Photovoltaic Conference
  • Place of Presentation: Gran Hotel Bali, Benidorm, Spain
  • Year and Date: 2009-05-11