Faculty Profiles - SUZUKI Atsushi

Papers - SUZUKI Atsushi

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Electronic structures and magnetic properties of Sc4O2@C-80(CF3)(n) (n=2 and 4) Reviewed

Yuma Abe, Atsushi Suzuki, Takeo Oku

JAPANESE JOURNAL OF APPLIED PHYSICS 53 ( 5 ) 05FN02 - 05FN05 2014.5

Language：English Publishing type：Research paper (scientific journal) Publisher：IOP PUBLISHING LTD

The electronic structures and magnetic properties of endohedral metallofullerenes based on an encapsulated scandium oxide cluster of Sc4O2 within a C-80 fullerene cage with the trifluoromethyl group CF3 were studied for nuclear magnetic resonance (NMR) quantum computers for the control of nuclear spin gates. The effects of the trifluoromethyl group with the fullerene cage on electronic structures and magnetic properties were investigated by quantum calculation using the density function theory. The addition of the substituent group CF3 on Sc4O2@C-80(CF3)(4) caused asymmetrical electronic structures and magnetic parameters with a widely separated chemical shift of C-13, Sc-45, and O-17-NMR. The isotropic A-tensor in the hyperfine coupling constant of ScII atoms in the Sc4O2@(80)(CF3)(2) cation radical originated from the electron density distribution localized on the s-orbital in Sc atoms. The spin-lattice relaxation time of 45Sc in the Sc4O2@C-80(CF3)(2) cation was calculated to be 72 mu s, which can be applied to the use of nuclear spins as quantum bits in NMR quantum computers. (C) 2014 The Japan Society of Applied Physics

DOI： 10.7567/JJAP.53.05FN02

Web of Science

Effect of gold nanoparticle in hole-transport layer on inverted organic thin-film solar cell performance Reviewed

Tsuyoshi Akiyama, Takuji Nishida, Taisuke Matsumoto, Hiroshi Sakaguchi, Atsushi Suzuki, Takeo Oku

Physica Status Solidi A 211 1645 - 1650 2014.4

Fabrication and characterization of PCBM:P3HT:silicon phthalocyanine bulk heterojunction solar cells with inverted structures Reviewed

Takeo Oku, Satoru Hori, Atsushi Suzuki, Tsuyoshi Akiyama and Yasuhiro Yamasaki

Japanese Journal of Applied Physics 53 05FJ08-1 - 05FJ08-5 2014.4

Language：English Publishing type：Research paper (scientific journal) Publisher：IOP Science

[6,6]-phenyl C61-butyric acid methyl ester and poly(3-hexylthiophene) bulk heterojunction solar cells doped with silicon phthalocyanine (SiPc) were fabricated and characterized. The photovoltaic properties of the solar cells with an inverted structure were improved by the SiPc addition, which were investigated on the bases of current density–voltage characteristics, incident photon to current conversion efficiency, and internal quantum efficiency. The solar cell with the inverted structure also showed good stability in air compared with the normal stacking devices. The microstructure of the solar cells was investigated by X-ray diffraction and transmission electron microscopy, and the carrier separation and transfer of the solar cells were discussed.

DOI： doi:10.7567/JJAP.53.05FJ08

Electronic structures and magnetic properties of Sc4O2@C80(CF3)n (n = 2 and 4) Reviewed

Yuma Abe, Atsushi Suzuki and Takeo Oku

Japanese Journal of Applied Physics 53 05FN02 - 05FN05 2014.4

Language：English Publishing type：Research paper (scientific journal) Publisher：IOP Science Participation form：Joint(The main charge)

The electronic structures and magnetic properties of endohedral metallofullerenes based on an encapsulated scandium oxide cluster of Sc4O2 within a C80 fullerene cage with the trifluoromethyl group CF3 were studied for nuclear magnetic resonance (NMR) quantum computers for the control of nuclear spin gates. The effects of the trifluoromethyl group with the fullerene cage on electronic structures and magnetic properties were investigated by quantum calculation using the density function theory. The addition of the substituent group CF3 on Sc4O2@C80(CF3)4 caused asymmetrical electronic structures and magnetic parameters with a widely separated chemical shift of 13C, 45Sc, and 17O-NMR. The isotropic A-tensor in the hyperfine coupling constant of ScII atoms in the Sc4O2@C80(CF3)2 cation radical originated from the electron density distribution localized on the s-orbital in Sc atoms. The spin–lattice relaxation time of 45Sc in the Sc4O2@C80(CF3)2 cation was calculated to be 72 µs, which can be applied to the use of nuclear spins as quantum bits in NMR quantum computers.

DOI： doi:10.7567/JJAP.53.05FN02

Electronic structures and magnetic properties of Sc2YN@C80(CF3)2 dimer Reviewed

Atsushi Suzuki and Takeo Oku

Japanese Journal of Applied Physics 53 05FN02 - 05FN05 2014.4

Language：English Publishing type：Research paper (scientific journal) Publisher：IOP Science Participation form：Joint(The main charge)

Electronic structures and magnetic properties of a Sc2YN@C80(CF3)2 dimer, a Sc3N@C80(CF3)2 dimer, and Sc2YN@C80(CF3)2 were investigated by quantum calculation using the density functional theory. The effect of the perturbation of dimerization on the electronic structure was based on the distorted molecular structure of the electron density distribution with an s,p,d-hybrid orbital at decreasing energy levels near the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO). Magnetic parameters of the isotropic chemical shifts of 14N, 45Sc, and 13C-NMR in 14N, 45Sc, and 13C atoms on the fullerene cage were calculated. The chemical shifts of 45Sc and 14N atoms in a dimer were due to the dipole–dipole and nuclear quadrupole interactions generated by an electrostatic potential with a slight modified electron density distribution and an atomic charge around a nucleus.

DOI： doi:10.7567/JJAP.53.05FN01

Fabrication and Characterization of Phthalocyanine-Based Organic Solar Cells Reviewed

Makoto Iwase, Atsushi Suzuki, Tsuyoshi Akiyama, Takeo Oku

Materials Sciences and Applications 5 278 - 284 2014.4

Language：English Publishing type：Research paper (scientific journal) Publisher：Scientific Research Participation form：Joint(The main charge)

Organic solar cells using poly (copper phthalocyanine), copper tetrakis (4-cumylphenoxy) phthalocyanine, copper phthalocyanine and titanyl phthalocyanine were fabricated and characterized. Photovoltaic properties of the solar cells with inverted structures were investigated by optical absorption, current density-voltage characteristic and incident photon to current conversion efficiency. These phthalocyanines absorbed light with wavelength longer than 500 nm. A carrier transport mechanism is proposed based on the energy level diagram.

DOI： DOI: 10.4236/msa.2014.55033

Fabrication and Characterization of Phthalocyanine-Based Organic Solar Cells Reviewed

Makoto Iwase, Atsushi Suzuki, Tsuyoshi Akiyama, Takeo Oku

Materials Sciences and Applications 5 278 - 284 2014.4

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

DOI： 10.4236/msa.2014.55033

Photovoltaic properties and morphology of organic solar cells based on liquid-crystal semiconducting polymer with additive Reviewed

Atsushi Suzuki, Masahito Zushi, Hisato Suzuki, Shinichi Ogahara, Tsuyoshi Akiyama and Takeo Oku

AIP Conf. Proc. 1585 164 - 170 2014.4

Language：English Publishing type：Research paper (scientific journal) Publisher：AIP Proceedings Participation form：Joint(The main charge)

Bulk heterojunction organic solar cell based on liquid crystal semiconducting polymers of poly[9,9-dioctylfluorene-co-bithiophene] (F8T2) as p-type semiconductors and fullerenes (C60) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) as electron donor and acceptor has been fabricated and characterized for improving photovoltaic and optical properties. The photovoltaic performance including current voltage curves in the dark and illumination of the F8T2/C60 conventional and inverted bulk heterojunction solar cells were investigated. Relationship between the photovoltaic properties and morphological behavior was focused on tuning for optimization of photo-voltaic performance under annealing condition near glass transition temperature. Additive-effect of diiodooctane (DIO) and poly(3-hexylthiophene-2,5-diyl) (P3HT) on the photovoltaic performance and optical properties was investigated. Mechanism of the photovoltaic properties of the conventional and inverted solar cells will be discussed by the experimental results.

DOI： DOI: 10.1063/1.4866636

Effects of Germanium Tetrabromide Addition to Zinc Tetraphenyl Porphyrin / Fullerene Bulk Heterojunction Solar Cells Reviewed

Atsushi Suzuki, Kenta Nishimura and Takeo Oku

Electronics 3 112 - 121 2014.3

Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI AG Participation form：Joint(The main charge)

The effects of germanium tetrabromide addition to tetraphenyl porphyrin zinc (Zn-TPP)/fullerene (C60) bulk heterojunction solar cells were characterized. The light-induced charge separation and charge transfer were investigated by current density and optical absorption. Addition of germanium tetrabromide inserted into active layer of Zn-TPP/C60 as bulk heterojunction had a positive effect on the photovoltaic and optical properties. The photovoltaic mechanism of the solar cells was discussed by experimental results. The photovoltaic performance was due to light-induced exciton promoted by insert of GeBr4 and charge transfer from HOMO of Zn-TPP to LUMO of C60 in the active layer.

DOI： doi:10.3390/electronics3010112

Effects of germanium tetrabromide addition to zinc tetraphenyl porphyrin / fullerene bulk heterojunction solar cells Reviewed

Atsushi Suzuki, Kenta Nishimura, Takeo Oku

Electronics (Switzerland) 3 ( 1 ) 112 - 121 2014.3

Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI AG

DOI： 10.3390/electronics3010112

Scopus

Photovoltaic Properties and Morphology of Organic Solar Cells based on Liquid-crystal Semiconducting Polymer with Additive Reviewed

Atsushi Suzuki, Masahito Zushi, Hisato Suzuki, Shinichi Ogahara, Tsuyoshi Akiyama, Takeo Oku

IRAGO CONFERENCE 2013 1585 164 - 170 2014

Language：English Publishing type：Research paper (international conference proceedings) Publisher：AMER INST PHYSICS

Bulk heterojunction organic solar cell based on liquid crystal semiconducting polymers of poly[9,9-dioctylfluorene-co-bithiophene] (F8T2) as p-type semiconductors and fullerenes (C-60) and [6,6]-phenyl-C-61-butyric acid methyl ester (PCBM) as electron donor and acceptor has been fabricated and characterized for improving photovoltaic and optical properties. The photovoltaic performance including current voltage curves in the dark and illumination of the F8T2/C-60 conventional and inverted bulk heterojunction solar cells were investigated. Relationship between the photovoltaic properties and morphological behavior was focused on tuning for optimization of photo-voltaic performance under annealing condition near glass transition temperature. Additive-effect of diiodooctane (DIO) and poly(3-hexylthiophene-2,5-diyl) (P3HT) on the photovoltaic performance and optical properties was investigated. Mechanism of the photovoltaic properties of the conventional and inverted solar cells will be discussed by the experimental results.

DOI： 10.1063/1.4866636

Web of Science

C-60-ethylenediamine adduct thin film as a buffer layer for inverted-type organic solar cells Reviewed

Yuji Ono, Tsuyoshi Akiyama, Shoto Banya, Daisuke Izumoto, Jo Saito, Katsuhiko Fujita, Hiroshi Sakaguchi, Atsushi Suzuki, Takeo Oku

RSC ADVANCES 4 ( 66 ) 34950 - 34954 2014

Language：English Publishing type：Research paper (scientific journal) Publisher：ROYAL SOC CHEMISTRY

Thin films of a C-60-ethylenediamine (EDA) adduct were prepared from an EDA solution of the adduct particles. An inverted-type organic thin-film solar cell using the thin film of the C-60-EDA adduct as a buffer layer was fabricated. The solar cell performance suggested that the C-60-EDA adduct thin film functioned as an electron-transporting layer, similarly to the titanium oxides in typical inverted-type organic thin-film solar cells.

DOI： 10.1039/c4ra03965c

Web of Science

Effect of gold nanoparticle in hole-transport layer on inverted organic thin-film solar cell performance Reviewed

Tsuyoshi Akiyama, Takuji Nishida, Taisuke Matsumoto, Hiroshi Sakaguchi, Atsushi Suzuki, Takeo Oku

Physica Status Solidi (A) Applications and Materials Science 211 ( 7 ) 1645 - 1650 2014

Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley-VCH Verlag

Inverted-type bulk-heterojunction organic thin-film solar cells with incorporated gold nanoparticles were fabricated and evaluated. Gold nanoparticles were incorporated into the hole-transport layer, and subsequently positioned behind the photoactive layer, away from the light-facing side of the solar cell. Incorporation of gold nanoparticles was confirmed by scanning electro microscopy, atomic force microscopy, and transmission absorption spectra. The incorporation of the gold nanoparticles improved the performance of the photovoltaic device, even gold nanoparticles were aggregated in the hole-transport layer. © 2014 WILEY-VCH Verlag GmbH &amp
Co. KGaA, Weinheim.

DOI： 10.1002/pssa.201330674

Scopus

Fabrication and characterization of organic solar cells using titanylphthalocyanine as hole transport layer Reviewed

Makoto Iwase, Atsushi Suzuki, Tsuyoshi Akiyama, Takeo Oku

Physica Status Solidi (A) Applications and Materials Science 211 ( 12 ) 2861 - 2864 2014

Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley-VCH Verlag

Organic solar cells using titanylphthalocyanine as a hole transport layer (HTL) were fabricated and characterized. Photovoltaic properties of the solar cells with inverted structures were investigated by optical absorption and current density-voltage (J-V) characteristic. The titanylphthalocyanine was mainly used as a buffer layer instead of PEDOT:PSS, and worked as HTL protecting the active layers.

DOI： 10.1002/pssa.201431068

Scopus

Fabrication and characterization of PCBM:P3HT bulk heterojunction solar cells doped with silicon naphthalocyanine Reviewed

Takeo Oku, Kazumi Yoshida, Atsushi Suzuki, Tsuyoshi Akiyama and Yasuhiro Yamasaki

Phys. Status Solidi C 10 ( 12 ) 1836 - 1839 2013.12

Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley Participation form：Joint(The vice charge)

[6,6]-phenyl C61-butyric acid methyl ester: poly(3-hexylthiophene) bulk heterojunction solar cells doped with silicon naphthalocyanine were fabricated and characterized. Photovoltaic properties of the solar cells with inverted structures were investigated by optical absorption, current density-voltage characteristic, incident photon to current conversion efficiency, and internal quantum efficiency. The silicon naphthalocyanine blended as the third component absorbed near-infrared light. Microstructure of the solar cells was investigated by X-ray diffraction, and energy levels of the solar cells were discussed.

DOI： DOI: 10.1002/pssc.201300369

Influence of chemical substitution in ScxY3-xN@C80(CF3)n endohedral fullerenes on magnetic properties Reviewed

Atsushi Suzuki, Takeo Oku

Physica B 428 18 - 26 2013.11

Fabrication and Characterization of PCBM:P3HT Bulk Heterojunction Solar Cells Doped with Germanium Phthalocyanine or Germanium Naphthalocyanine Reviewed

Kazumi Yoshida, Takeo Oku, Atsushi Suzuki, Tsuyoshi Akiyama, Yasuhiro Yamasaki

Materials Sciences and Applications 4 1 - 5 2013.5

Fabrication and Characterization of PCBM:P3HT Bulk Heterojunction Solar Cells Doped with Germanium Phthalocyanine or Germanium Naphthalocyanine Reviewed

Kazumi Yoshida, Takeo Oku, Atsushi Suzuki, Tsuyoshi Akiyama, Yasuhiro Yamasaki

Materials Sciences and Applications 4 1 - 5 2013.5

Fabrication and characterization of polysilane: PCBM bulk heterojunction solar cells Reviewed

Kazumi Yoshida, Takeo Oku, Atsushi Suzuki, Tsuyoshi Akiyama, Katsuhisa Tokumitsu, Mika Nakamura, Masahiro Yamada

Central European Journal of Engineering 3 ( 2 ) 165 - 169 2013.4

Microstructures and Photovoltaic Properties of Polysilane-Based Solar Cells Reviewed

Takeo Oku, Junya Nakagawa, Makoto Iwase, Atsushi Kawashima, Kazumi Yoshida, Atsushi Suzuki, Tsuyoshi Akiyama, Katsuhisa Tokumitsu, Masahiro Yamada, Mika Nakamura,

Japanese Journal of Applied Physics 52 04CR07-1 - 04CR07-5 2013.4

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Papers - SUZUKI Atsushi