Faculty Profiles - AKIYAMA Tsuyoshi

Papers - AKIYAMA Tsuyoshi

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Fabrication and characterization of ZnO/Cu<inf>2</inf>O solar cells prepared by electrodeposition Reviewed

Fujimoto K., Oku T., Akiyama T.

Applied Physics Express 6 ( 8 ) 2013.8

Language：English Publishing type：Research paper (scientific journal) Publisher：Applied Physics Express

Cuprous oxide (Cu O)-based solar cells containing zinc oxide (ZnO) were fabricated on F-doped tin oxide (FTO) by electrodeposition. Cu O layers were deposited from a pH-adjusted electrolyte consisting of LiOH, NaOH or KOH. A photovoltaic device based on a FTO/ZnO/Cu O/Au heterojunction structure was prepared using LiOH, and it gave a power conversion efficiency of 1.43% under air mass 1.5 illumination. © 2013 The Japan Society of Applied Physics. 2 2 2

DOI： 10.7567/APEX.6.086503

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Densely arranged two-dimensional silver nanoparticleassemblies with optical uniformity over vast areas asexcellent surface-enhanced Raman scattering substrates（共著） Reviewed

Tanoue, Yoshimasa; Sugawa, Kosuke*; Yamamuro, Takahiro; Akiyama, Tsuyoshi*.

Physical Chemistry Chemical Physics 15 15802 - 15805 2013.7

Fabrication and Characterization of ZnO/Cu2O Solar Cells Prepared by Electrodeposition（共著） Reviewed

Fujimoto, Kazuya; Oku, Takeo*; Akiyama, Tsuyoshi.

Applied Physics Express 6 086503(1) - 086503(4) 2013.7

Fabrication and characterization of fullerene-based solar cells containing phthalocyanine and naphthalocyanine dimers Reviewed

Takeda A., Oku T., Suzuki A., Akiyama T., Yamasaki Y.

Synthetic Metals 177 48 - 51 2013.7

Language：English Publishing type：Research paper (scientific journal) Publisher：Synthetic Metals

Fullerene-based solar cells with normal and inverted structures containing phthalocyanine and naphthalocyanine dimers were fabricated by vacuum evaporation. Power conversion efficiencies were measured under simulated sunlight conditions. Fabricated devices exhibited high stability in air and a wide optical absorption from 320 to 800 nm. A carrier transport mechanism is proposed based on the energy level diagram. © 2013 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.synthmet.2013.06.011

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Preparation and photovoltaic application of fullereneporphyrin composite micropowder Reviewed

Kimura K., Oku T., Akiyama T.

Chemistry Letters 42 ( 7 ) 694 - 696 2013.7

Language：English Publishing type：Research paper (scientific journal) Publisher：Chemistry Letters

C fullerene and 5,10,15,20-tetrakis(4-aminophenyl)porphyrin (TAPP) composite micropowder was prepared by simply mixing C and TAPP in an organic solvent under ambient conditions. The composite micropowder contributed to photoelectric conversion, which was confirmed by a semi-wet-type photovoltaic application. © 2013 The Chemical Society of Japan. 60 60

DOI： 10.1246/cl.130114

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Microstructures and photovoltaic properties of C<inf>60</inf> based solar cells with copper oxides, CuInS<inf>2</inf>, phthalocyanines, porphyrin, PVK, nanodiamond, germanium and exciton diffusion blocking layers Reviewed

Oku T., Takeda A., Nagata A., Kidowaki H., Kumada K., Fujimoto K., Suzuki A., Akiyama T., Yamasaki Y., Osawa E.

Energy Materials: Materials Science and Engineering for Energy Systems 8 ( 1 ) 21 - 39 2013.6

Language：English Publishing type：Research paper (scientific journal) Publisher：Energy Materials: Materials Science and Engineering for Energy Systems

Organic solar cells have a potential for use in lightweight, flexible, inexpensive and large scale solar cells. However, significant improvements of photovoltaic efficiencies are mandatory for use in future solar power plants. One of the improvements is donor-acceptor proximity in the devices, which are called bulk heterojunction solar cells. Bulk heterojunction is an efficient method to generate free charge carriers, and the charge transfer is possible at the semiconductor interface. The purpose of the present work is to fabricate and characterise C based solar cells with copper oxides, CuInS , phthalocyanines, porphyrin, poly-vinylcarbazole, nanodiamond, germanium and exciton diffusion blocking layers. In the present work, C and fullerenol [C (OH)10-12] were used for n-type semiconductors, and metal copper oxides, metal phthalocyanine derivative, porphyrin and poly-vinylcarbazole were used for p-type semiconductors. In addition, nanodiamond and germanium based molecules were added into the active layers of the solar cells. The novel aspect of the research is to investigate the relation between properties and microstructures of the solar cells using transmission electron microscopy, X-ray diffraction and electronic structure calculation. The impact of the research concerns the study of organic solar cells by means of microstructural analysis, property measurements and theoretical calculations. © 2013 W. S. Maney & Son Ltd. 60 2 60 60

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Incorporation Effect of Silver Nanoparticles on Inverted Type Bulk-Heterojunction Organic Solar Cells（共著） Reviewed

Matsumoto, Taisuke; Oku, Takeo; Akiyama, Tsuyoshi*.

Japanese Journal of Applied Physics 52 04CR13(1) - 04CR13(5) 2013.4

Fabrication of C60 assembly films via an fullerene-amine addition reaction by using stepwise immersion（共著） Reviewed

Banya, Shoto; Matsumoto, Taisuke; Oku, Takeo; Akiyama, Tsuyoshi*.

Journal of Physics: Conference Series 433 012007(1) - 012007(5) 2013.4

Effects of phosphorous doping to poly (methylphenyl silane) and fabrication of thin film solar cells（共著） Reviewed

Nakagawa, Junya; Oku, Takeo; Suzuki, Atsushi; Akiyama, Tsuyoshi; Tokumitsu, Katsuhisa; Yamada, Masahiro; Nakamura, Mika.

Journal of Physics: Conference Series 433 012026(1) - 012026(7) 2013.4

Fabrication and characterization of silicon naphthalocyanine,gallium phthalocyanine and fullerene-based organic solar cellswith inverted structures（共著） Reviewed

Oku, Takeo; Nose, Shigefumi; Yoshida, Kazumi; Suzuki, Atsushi; Akiyama, Tsuyoshi; Yamasaki, Yasuhiro.

Journal of Physics: Conference Series 433 012025(1) - 012025(7) 2013.4

Fabrication and characterization of copper oxide-zinc oxidesolar cells prepared by electrodeposition（共著） Reviewed

Fujimoto, Kazuya; Oku, Takeo; Akiyama, Tsuyoshi; Suzuki, Atsushi.

Journal of Physics: Conference Series 433 012024(1) - 012024(7) 2013.4

Fabrication and characterization of polymer tandem solar cells（共著） Reviewed

Marsuhashi, Haruto*; Suzuki, Atsushi; Akiyama, Tsuyoshi; Oku, Takeo.

Journal of Physics: Conference Series 433 012023(1) - 012023(6) 2013.4

Photochemical half-cells using mixture films of fullerene-ethylenediamine adduct microparticles and polythiophene（共著） Reviewed

Akiyama, Tsuyoshi*; Matsumura, Satoshi; Matsuoka, Ken-ichi; Oku, Takeo; Yamada, Sunao.

Journal of Physics: Conference Series 433 012010(1) - 012010(6) 2013.4