研究者詳細 - 秋山　毅

論文 - 秋山　毅

分割表示235 件中 161 - 180 件目／全件表示 >>

Fabrication and Characterization of CuO-based Solar Cells（共著）査読

Hiroki Kidowaki, Takeo Oku, Tsuyoshi Akiyama, Atsushi Suzuki Balachandran Jeyadeva, Jhon Cuya

Journal of Materials Science Research 1 138 - 143 2012年1月

Effects of Au nanoparticle addition to hole transfer layer in organic photovoltaic cells based on phthalocyanines and fullerene 査読

Nagata A., Oku T., Akiyama T., Suzuki A., Yamasaki Y., Mori T.

Journal of Nanotechnology 2011年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Nanotechnology

Phthalocyanines/fullerene organic photovoltaic cells were fabricated and characterized. Effects of Au nanoparticle addition to a hole transfer layer were also investigated, and power conversion efficiencies of the photovoltaic cells were improved after blending the Au nanoparticle into PEDOT:PSS. Nanostructures of the Au nanoparticles were investigated by transmission electron microscopy and X-ray diffraction. Energy levels of molecules were calculated by molecular orbital calculations, and the nanostructures and electronic property were discussed. Copyright © 2011 Akihiko Nagata et al.

DOI： 10.1155/2011/869596

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Effects on Au Nanoparticle Addition to Hole Transfer Layer in Organic Photovoltaic Cells Based on Phthalocyanines and Fullerene（共著）査読

A. Nagata, T. Oku, T. Akiyama, A. Suzuki, Y. Yamasaki, T. Mori

Journal of Nanotechnology 2011 869596-1 - 869596-6 2011年12月

Electrochemical Modulation of the Optical Property of Polythiophene-Gold Nanorod Composite Films（共著）査読

Kosuke Sugawa, Shuichi Hirono, Tsuyoshi Akiyama, Sunao Yamada

Photochemical & Photobiological Sciences 11 318 - 322 2011年11月

Structures and photovoltaic properties of copper oxides/fullerene solar cells 査読

Oku T., Motoyoshi R., Fujimoto K., Akiyama T., Jeyadevan B., Cuya J.

Journal of Physics and Chemistry of Solids 72 ( 11 ) 1206 - 1211 2011年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Physics and Chemistry of Solids

Copper oxide (CuO ) thin films were produced by spin-coating and electrodeposition methods, and their microstructures and photovoltaic properties were investigated. Thin film solar cells based on the Cu O/C and CuO/C heterojunction or bulk heterojunction structures were fabricated on F-doped or In-doped SnO , which showed photovoltaic activity under air mass 1.5 simulated sunlight conditions. Microstructures of the CuO thin films were examined by X-ray diffraction and transmission electron microscopy, which indicated the presence of Cu O and CuO nanoparticles. The energy levels of the present solar cells were also discussed. © 2011 Elsevier Ltd. All rights reserved. x 2 60 60 2 x 2

DOI： 10.1016/j.jpcs.2011.06.014

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Structures and photovoltaic properties of copper oxides/fullerene solar cells（共著）査読

T. Oku, R. Motoyoshi, K. Fujimoto, T. Akiyama, B. Jeyadevan, J. Cuya

Journal of Physics and Chemistry of Solids 72 1206 - 1211 2011年11月

Effects of capping layers on the photoelectrochemical property of silver nanoparticle-modified indium-tin-oxide electrode （共著）査読

Ken-ichi Matsuoka,HironobuTahara,TsuyoshiAkiyama,SunaoYamada

Journal of Photochemistry and Photobiology A: Chemistry 221 239 - 243 2011年6月

Effects of capping layers on the photoelectrochemical property of silver nanoparticle-modified indium-tin-oxide electrode 査読

Matsuoka K.I., Tahara H., Akiyama T., Yamada S.

Journal of Photochemistry and Photobiology A: Chemistry 221 ( 2-3 ) 239 - 243 2011年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Photochemistry and Photobiology A: Chemistry

Photoelectrochemical properties of indium-tin-oxide (ITO) substrate modified with silver nanoparticles (AgNPs) and effects of surface capping layer of AgNP were investigated in the water/acetonitrile (H O/MeCN) electrolyte solutions with the presence of oxygen as an electron acceptor. The modified ITO substrate showed photocurrent response mainly driven by the photoinduced electron transfer from ITO substrate to AgNPs. In addition, its photoelectrochemical property significantly depended on the solvent composition of electrolyte solution which was in correlation with surface status of AgNPs. Combination of photoelectrochemical measurements and spectroscopic analysis suggested that presence of considerable amount of MeCN in the electrolyte solution triggered partial displacement of capping citrate ions to activate photocurrent generation. © 2011 Elsevier B.V. All rights reserved. 2

DOI： 10.1016/j.jphotochem.2011.03.015

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Fabrication and characterization of copper oxides/fullerene solar cells prepared by an electrodeposition method（共著）査読

Kazuya FUJIMOTO, Takeo OKU, Tsuyoshi AKIYAMA

Journal of the Ceramics Society of Japan 119 402 - 404 2011年6月

An influence of monomeric porphyrin structure on the electropolymerized photoactive electrode for polymer solar cells 査読

Takechi K., Takahashi N., Shiga T., Akiyama T., Yamada S.

Molecular Crystals and Liquid Crystals 538 10 - 14 2011年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Molecular Crystals and Liquid Crystals

We have fabricated and compared photocurrent generation properties of electropolymerized films consisting of 2,2'-bithiophene and a porphyrin derivative, 5,10,15,20-tetra(3-thienyl)-21H,23H-porphyrin or 5,10,15,20-tetra(2-thienyl)-21H,23H-porphyrin. It was found that the location and the concentration of porphyrin moieties in the films were different between the two porphyrin monomers, and the polymer film with the former porphyrin gave larger photocurrent than the latter. The result indicates that the molecular design of the polymer electrode is very important for effective photocurrent generation. Copyright © Taylor & Francis Group, LLC.

DOI： 10.1080/15421406.2011.563206

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An Influence of Monomeric Porphyrin Structure on the Electropolymerized Photoactive Electrode for Polymer Solar Cells（共著）査読

Kensuke Takechi, Naoko Takahashi, Tohru Shiga, Tsuyoshi Akiyama, Sunao Yamada.

Molecular Crystals and Liquid Crystals 538 10 - 14 2011年5月

Electrochemical Modulation of the Optical Property of Polythiophene-Gold Nanorod Composite Films（共著）査読

K. Sugawa, T. Akiyama and S. Yamada

Molecular Crystals and Liquid Crystals 539 341 - 344 2011年5月

Fabrication and photocurrent generation of multilayer assemblies consisting of silver-nanoparticles, polydiacetylene, and polyions 査読

Akiyama T., Masuhara A., Matsuda Y., Arakawa T., Munaoka T., Onodera T., Oikawa H., Yamada S.

Japanese Journal of Applied Physics 50 ( 4 PART 2 ) 2011年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Japanese Journal of Applied Physics

The fabrication of silver nanoparticle and polydiacetylene nanocrystal multilayer assemblies was successful on indium-tin-oxide transparent electrodes by repeating electrostatic layer-by-layer deposition. Adsorbed amount of silver nanoparticles and polydiacetylene nanocrystals was confirmed by visible absorption spectroscopy. The surface conditions and morphologies of the assemblies were investigated by scanning electron microscopy. In the presence of a sacrificial reagent, these multilayer assemblies generated a stable photocurrent. It has become apparent that polydiacetylene nanocrystals are not also photoexciting material in the present system, but also act as an electron relay or transport material. Therefore, photocurrent generation is assisted under the co-existence of polydiacetylene nanocrystals in the assemblies. © 2011 The Japan Society of Applied Physics.

DOI： 10.1143/JJAP.50.04DH15

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Silver-nanoparticle-assisted photocurrent generation in polythiophene-fullerene thin films 査読

You J., Arakawa T., Munaoka T., Akiyama T., Takahashi Y., Yamada S.

Japanese Journal of Applied Physics 50 ( 4 PART 2 ) 2011年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Japanese Journal of Applied Physics

We have investigated the effect of silver nanoparticles (AgPs) on the photocurrent generation of a polyphiophene-fullerene photovoltaic film. Poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C -butyric acid methylester (PCBM) were used for the electron donor and acceptor, respectively. First, AgPs were electrostatically deposited upon the surface of an indium tin oxide (ITO) electrode via a polycation. Then, a film of P3HT or a mixture of P3HT and PCBM was prepared by spin coating. The thickness of the film was evaluated by atomic force microscopy. Absorption and fluorescence spectral measurements were carried out to investigate the effects of AgPs. Photocurrent spectra were also measured, and the effects of AgPs on photocurrent enhancement were verified. © 2011 The Japan Society of Applied Physics. 61

DOI： 10.1143/JJAP.50.04DK22

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Silver-Nanoparticle-Assisted Photocurrent Generation in Polythiophene-Fullerene Thin Films （共著）査読

Jing You, Taichi Arakawa, Takatoshi Munaoka, Tsuyoshi Akiyama, Yukina Takahashi, Sunao Yamada

Japanese Journal of Applied Physics 50 04DK22-1 - 04DK22-4 2011年4月

Fabrication and Photocurrent Generation of Multilayer Assemblies Consisting of Silver-nanoparticles, Polydiacetylene, and Polyions　（共著）査読

Tsuyoshi Akiyama, Akito Masuhara, Yoshihisa Matsuda, Taichi Arakawa, Takatoshi Munaoka, Tsunenobu Onodera, Hidetoshi Oikawa, Sunao Yamada

Japanese Journal of Applied Physics 50 04DH15-1 - 04DH15-4 2011年4月

Electrochemical modulation of the optical property of polythiophene-gold nanorod composite films 査読

Sugawa K., Akiyama T., Yamada S.

Molecular Crystals and Liquid Crystals 539 1/[341] - 4/[344] 2011年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Molecular Crystals and Liquid Crystals

In order to electrochemically modulate the optical property of transparent films, we have fabricated composite films consisting of gold nanorods having strong absorption bands in near infrared region and polythiophene exhibiting electrochemical activity. On applying electrochemical potentials of 800 and 0mV repeatedly, the plasmon band showed irreversible but consecutive changes due to the proceeding of aggregation of the nanorods in the film, while the absorption of polythiophene around 540nm changed reversibly. It was found the composite film could electrochemically modulate the color of the film, by utilizing the aggregation of gold nanorods in the electrochemically reversible polythiophene film. Copyright © Taylor & Francis Group, LLC.

DOI： 10.1080/15421406.2011.566021

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Fabrication and characterization of copper oxides/fullerene solar cells prepared by an electrodeposition method 査読

Fujimoto K., Oku T., Akiyama T.

Journal of the Ceramic Society of Japan 119 ( 1390 ) 402 - 404 2011年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of the Ceramic Society of Japan

Copper oxide based solar cells with fullerene (C ) were fabricated on indium tin oxide (ITO) by an electrodeposition method. Cell performance of the solar cells with the Cu O/C and CuO/C structures was investigated. A photovoltaic device based on an ITO/Cu O/C heterojunction structure provided short-circuit current density of 67μA cm and open circuit voltage of 0.20Vunder an air mass 1.5 illumination. The microstructures of the Cu O and CuO layers were examined, and the energy levels of the present solar cells were also discussed. © 2011 The Ceramic Society of Japan. 60 2 60 60 2 60 2 -2

DOI： 10.2109/jcersj2.119.402

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Effects of hole transport layer on photoelectrochemical responses from polythiophene-porphyrin composite polymer electrode 査読

Takechi K., Shiga T., Akiyama T., Yamada S.

Applied Physics Express 3 ( 12 ) 2010年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Applied Physics Express

The effect of a hole transport layer on the photoelectrochemical responses from an organic solar cell consisting of a composite polymer film of 5,10,15,20-tetra(3-thienyl)-21H,23H-porphyrin and polythiophene was investigated. The polyalkylthiophene layer that was inserted between the above-described photoactive polymer film and a transparent electrode acted as the hole transport layer. This layer remarkably suppressed the recombination of separated charge carriers generated in the composite polymer film and substantially improved both photocurrent and conversion efficiencies. © 2010 The Japan Society of Applied Physics.

DOI： 10.1143/APEX.3.122301

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Effects of Hole Transport Layer on Photoelectrochemical Responses from Polythiophene-Porphyrin Composite Polymer Electrode （共著）査読

Kensuke Takechi, Tohru Shiga, Tsuyoshi Akiyama, Sunao Yamada

Applied Physics Express 3 122301-1 - 122301-3 2010年12月

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