Faculty Profiles - AKIYAMA Tsuyoshi

Papers - AKIYAMA Tsuyoshi

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FABRICATION AND EVALUATION OF CuO/ZnO HETEROSTRUCTURES FOR PHOTOELECTRIC CONVERSION Reviewed

Hiroki Kidowaki, Takeo Oku & Tsuyoshi Akiyama

International Journal of Research and Reviews in Applied Sciences 13 ( 1 ) 67 - 72 2012.10

Fabrication and Characterization of Poly[Decaphenylcyclopentasilane]-Based Solar Cells Reviewed

Makoto Iwase, Takeo Oku, Atsushi Suzuki, Tsuyoshi Akiyama, Katsuhisa Tokumitsu, Masahiro Yamada, Mika Nakamura

Advances in Materials Physics and Chemistry 2 ( 3 ) 121 - 125 2012.9

Fabrication and characterization of tetracyanoquinodimethane/phthalocyanine solar cells Reviewed

Atsushi Suzuki, Takahiro Ohtsuki, Takeo Oku, Tsuyoshi Akiyama

Materials Science and Engineering: B 177 ( 11 ) 877 - 881 2012.6

Electropolymerized Polythiophene Photoelectrodes with Density-Controlled Gold Nanoparticles Reviewed

Yukina Takahashi, Sakiko Taura, Tsuyoshi Akiyama, and Sunao Yamada

Langmuir 28 ( - ) 9155 - 9160 2012.6

Facile Fabrication and Raman Scattering Enhancement Properties of Mixed Gold and Silver Nanoparticle Layers Reviewed

Tsuyoshi Akiyama

e-Journal of Surface Science and Nanotechnology 10 ( - ) 157 - 160 2012.4

Tuning Optical Properties of Two-Dimensional Ordered Arrays of Silica/Gold and Silver Core/Shell Structured Nanoparticles in Near-Infrared Region Reviewed

Kosuke Sugawa, Tatsuya Sakai, Daido Tanaka, and Tsuyoshi Akiyama

Japanese Journal of Applied Physics 51 ( - ) 04DH04-1 - 04DH04-5 2012.4

Organic Solar Cells Based on Electrodeposited Polyaniline Films Reviewed

Kei Inoue, Tsuyoshi Akiyama, Atsushi Suzuki, and Takeo Oku

Japanese Journal of Applied Physics 51 ( - ) 04DK10-1 - 04DK10-4 2012.4

Fabrication and characterization of poly[diphenylsilane]-based solar cells "jointly worked" Reviewed

M. Iwase, T. Oku, A. Suzuki, T. Akiyama, K. Tokumitsu, M. Yamada, M. Nakamura

Journal of Physics: Conference Series 352 012018-1 - 012018-5 2012.3

Microstructure analysis of spherical silicon solar cells coated with anti-reflection films "jointly worked" Reviewed

Y. Ono, T. Oku, T. Akiyama, Y. Kanamori, Y. Ohnishi, Y. Ohtani, M. Murozono

Journal of Physics: Conference Series 352 012023-1 - 012023-5 2012.3

Fabrication and characterization of CuO/ZnO solar cells "jointly worked" Reviewed

H. Kidowaki, T. Oku, T. Akiyama

Journal of Physics: Conference Series 352 012022-1 - 012022-5 2012.3

Fabrication and characterization of polysilane/C60 thin film solar cells "jointly worked" Reviewed

J. Nakagawa, T. Oku, A. Suzuki, T. Akiyama, K. Tokumitsu, M. Yamada and M. Nakamura

Journal of Physics: Conference Series 352 012019-1 - 012019-5 2012.3

Microstructures and photovoltaic properties of fullerene-based organic-inorganic hybrid solar cells "jointly worked" Reviewed

T. Oku, A. Takeda, A. Nagata, K. Fujimoto, T. Akiyama, A. Suzuki

Journal of Physics: Conference Series 352 012024-1 - 012024-9 2012.3

Effects of Film Thickness on the Photocurrent Generation from Polythiophene-Fullerene Thin Films Containing Silver Nanoparticles "jointly worked" Reviewed

Jing You, Yukina Takahashi, Hiroaki Yonemura, Tsuyoshi Akiyama, Sunao Yamada

Japanese Journal of Applied Physics 51 02BK04-1 - 02BK04-4 2012.2

Photocurrent enhancement tuned with plasmonic resonance in self-assembled monolayers fabricated on regularly arrayed gold nanostructures Reviewed

Kosuke Sugawa, Shuichi Hirono, Tsuyoshi Akiyama and Sunao Yamada

Photochemical & Photobiological Sciences 11 ( 2 ) 318 - 322 2012.2

Effects of film thickness on the photocurrent generation from polythiophene-fullerene thin films containing silver nanoparticles Reviewed

You J., Takahashi Y., Yonemura H., Akiyama T., Yamada S.

Japanese Journal of Applied Physics 51 ( 2 PART 2 ) 2012.2

Language：English Publishing type：Research paper (scientific journal) Publisher：Japanese Journal of Applied Physics

We have investigated the incident-photon-to-current conversion efficiency (IPCE) of thin films of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl- C -butyric acid methylester (PCBM) as a function of film thickness, in the presence or absence of silver nanoparticles (AgPs) between the films and the indium-tin-oxide (ITO) electrode. The thickness of the film was evaluated by atomic force microscopy. The absorption and photocurrent action spectra of the films were measured to investigate the effect of the thickness of the P3HT:PCBM film. The results show that IPCE increased steeply in thinner films and the optimal range of thicknesses of the P3HT:PCBM film was 50-120 nm. In this optimal range, the IPCEs were 1.5- 1.8 times larger in the presence of AgPs. © 2012 The Japan Society of Applied Physics. 61

DOI： 10.1143/JJAP.51.02BK04

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Fabrication and characterization of CuO/ZnO solar cells Reviewed

Kidowaki H., Oku T., Akiyama T.

Journal of Physics: Conference Series 352 ( 1 ) 2012.1

Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Physics: Conference Series

Cuprous oxide (CuO) and zinc oxide (ZnO) heterojunction solar cells fabricated on indium tin oxide-coated glass were studied. CuO and ZnO films were deposited using a galvanostatic method. Structural, morphological and optoelectronic properties of the CuO/ZnO heterojunction were studied by using X-ray diffraction, atomic force microscopy and light current-voltage characteristics. © Published under licence by IOP Publishing Ltd.

DOI： 10.1088/1742-6596/352/1/012022

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Microstructures and photovoltaic properties of fullerene-based organic-inorganic hybrid solar cells Reviewed

Oku T., Takeda A., Nagata A., Fujimoto K., Akiyama T., Suzuki A.

Journal of Physics: Conference Series 352 ( 1 ) 2012.1

Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Physics: Conference Series

C -based bulk heterojunction solar cells were fabricated, and the electronic and optical properties were investigated. C were used as n-type semiconductors, and copper oxides, CuInS and diamond were used as p-type semiconductors. Electronic structures of the molecules were investigated by molecular orbital calculation, and energy levels of the solar cells were discussed. Nanostructures of the solar cells were investigated by transmission electron microscopy, electron diffraction and X-ray diffraction, which indicated formation of mixed nanocrystals. © Published under licence by IOP Publishing Ltd. 60 60 2

DOI： 10.1088/1742-6596/352/1/012024

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Microstructure analysis of spherical silicon solar cells coated with anti-reflection films Reviewed

Ono Y., Oku T., Akiyama T., Kanamori Y., Ohnishi Y., Ohtani Y., Murozono M.

Journal of Physics: Conference Series 352 ( 1 ) 2012.1

Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Physics: Conference Series

Microstructures of spherical silicon solar cells were investigated by transmission electron microscopy and X-ray diffraction. Optical absorption and photoluminescence of the solar cells were also measured by UV-visible and fluorescence spectroscopy. F-doped SnO anti-reflection coating layers were investigated by XRD, and the nanostructures and grain sizes were determined. The present work indicated a guideline for spherical silicon solar cells with higher efficiencies. © Published under licence by IOP Publishing Ltd. 2

DOI： 10.1088/1742-6596/352/1/012023

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Fabrication and characterization of polysilane/C<inf>60</inf> thin film solar cells Reviewed

Nakagawa J., Oku T., Suzuki A., Akiyama T., Tokumitsu K., Yamada M., Nakamura M.

Journal of Physics: Conference Series 352 ( 1 ) 2012.1

Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Physics: Conference Series

Polysilane/fullerene bulk heterojunction solar cells were fabricated on indium tin oxide electrode by a spin-coating method, and performance and microstructures of the solar cell were investigated. Poly-methyl-phenylsilane, poly-phenylsilane, deca-phenyl-cyclopentasilane and [6,6]-phenyl C -butyric acid methyl ester (PCBM), poly[3-hexylthiophene] (P3HT) were used for the present cells. A device based on the P3HT and PCBM provided better efficiency, fill factor, and short-circuit current compared to those of a device based on P3HT and fullerene. © Published under licence by IOP Publishing Ltd. 61

DOI： 10.1088/1742-6596/352/1/012019

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Fabrication and characterization of poly[diphenylsilane]-based solar cells Reviewed

Iwase M., Oku T., Suzuki A., Akiyama T., Tokumitsu K., Yamada M., Nakamura M.

Journal of Physics: Conference Series 352 ( 1 ) 2012.1

Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Physics: Conference Series

Poly[diphenylsilane] (PDPS)-based photovoltaic cells were fabricated by using mixture solution of PDPS, phosphorus and boron. An influence of phosphorus and boron doping into PDPS on the performance of the photovoltaic device was investigated. The solar cell using fluorine doped tin oxide glass plates provided short-circuit current density of 0.12 mA/cm and open-circuit voltage of 0.28 V under simulated sunlight. Energy levels, formation mechanism and microstructure of the solar cells were discussed. © Published under licence by IOP Publishing Ltd. 2

DOI： 10.1088/1742-6596/352/1/012018

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Papers - AKIYAMA Tsuyoshi