Faculty Profiles - SUZUKI Atsushi

Papers - SUZUKI Atsushi

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Doping effects of transition metal elements to titanium dioxide for perovskite solar cells Reviewed International journal

Jo Saito, Atsushi Suzuki, Tsuyoshi Akiyama, Takeo Oku

AIP Conference Proceedings 020010 2017.1

Effects of SbBr3 addition to CH3NH3PbI3 solar cells Reviewed International journal

Takeo Oku, Yuya Ohishi, Atsushi Suzuki

AIP Conference Proceedings 1807 ( 020007 ) 1 - 5 2017.1

Doping effects of transition metal elements to titanium dioxide for perovskite solar cells Reviewed

Jo Saito, Atsushi Suzuki, Tsuyoshi Akiyama, Takeo Oku

AIP Conference Proceedings 020010 2017.1

Fabrication and Characterization of PCBM: P3HT-based Thin-film Organic Solar Cells with Zinc Phthalocyanine and 1,8-Diiodooctane Reviewed International journal

Haruto Maruhashi, Takeo Oku, Atsushi Suzuki, Tsuyoshi Akiyama, Yasuhiro Yamasaki

Chemical and Materials Engineering 5 ( 1 ) 1 - 7 2017.1

Structures and photovoltaic properties of element-doped CH<inf>3</inf>NH<inf>3</inf>PBI<inf>3</inf>perovskite solar cells Reviewed

Oku T., Zushi M., Suzuki K., Ohishi Y., Matsumoto T., Iwata T., Ueoka N., Suzuki A.

Organic Solar Cells: Advances in Research and Applications 51 - 89 2017.1

Language：English Publishing type：Research paper (scientific journal) Publisher：Organic Solar Cells: Advances in Research and Applications

© 2017 Nova Science Publishers, Inc. CH3NH3PbI3-based perovskite solar cells were fabricated and characterized. Metal doping and halogen doping to the perovskite and TiO2 were investigated. Increases in the efficiencies of the devices were observed, which was due to the structural change of the perovskite compound layers. X-ray diffraction analysis and transmission electron microscopy were used for investigation of the devices. The structure analysis by them showed structural transformation of the crystal structure of the perovskite, which indicated that a cubic-tetragonal crystal system depended on the annealing condition and element-doping.

Scopus

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Fabrication and Characterization of PCBM: P3HT-based Thin-film Organic Solar Cells with Zinc Phthalocyanine and 1,8-Diiodooctane Reviewed

Haruto Maruhashi, Takeo Oku, Atsushi Suzuki, Tsuyoshi Akiyama, Yasuhiro Yamasaki

Chemical and Materials Engineering 5 ( 1 ) 1 - 7 2017.1

Structures and photovoltaic properties of element-doped CH<inf>3</inf>NH<inf>3</inf>PBI<inf>3</inf>perovskite solar cells Reviewed

Oku T, Zushi M, Suzuki K, Ohishi Y, Matsumoto T, Iwata T, Ueoka N, Suzuki A

Organic Solar Cells: Advances in Research and Applications 51 - 89 2017.1

Language：English Publishing type：Research paper (scientific journal) Publisher：Organic Solar Cells: Advances in Research and Applications

Fabrication and characterization of perovskite based solar cells using phthalocyanine and naphthalocyanine as hole-transporting layer Reviewed

Yuki Okada, Atsushi Suzuki, Yasuhiro Yamasaki, Takeo Oku

IRAGO CONFERENCE 2016: 360 DEGREE OUTLOOK ON CRITICAL SCIENTIFIC AND TECHNOLOGICAL CHALLENGES FOR A SUSTAINABLE SOCIETY 1807 020015 2017

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

Organic-inorganic hybrid heterojunction solar cells containing CH3NH3PbI3 perovskite compound were fabricated using TiO2 as an electronic transporting layer and spirobifluorence as a hole-transporting layer. The purpose of the present study is to investigate a role of the hole-transporting layer on the photovoltaic properties and microstructures of CH3NH3PbI3 perovskite solar cells. The X-ray diffraction identified crystal structures of the perovskite layer in the solar cells. Optical microscopy showed different surface morphologies, and the perovskite structures on the TiO2 mesoporous structure depended on addition of phthalocyanine into the hole-transporting layer. The photovoltaic properties and holetransporting behavior was depending on carrier mobility, electron structures of the perovskite crystal and band gaps related with the photovoltaic parameters. Energy diagram and photovoltaic mechanism of the perovskite solar cells using holetransporting layers were discussed by experimental results. Perovskite based solar cells using phthalocyanines as holetransporting layers have advantages to provide a high photovoltaic performance with a wide region of optical absorption.

DOI： 10.1063/1.4974797

Web of Science

Fabrication and electrochemical properties of insoluble fullerene-diamine adduct thin-films as buffer layer by alternate immersion process Reviewed

Jo Saito, Tsuyoshi Akiyama, Atsushi Suzuki, Takeo Oku

IRAGO CONFERENCE 2016: 360 DEGREE OUTLOOK ON CRITICAL SCIENTIFIC AND TECHNOLOGICAL CHALLENGES FOR A SUSTAINABLE SOCIETY 1807 020017 2017

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

Insoluble fullerene-diamine adduct thin-films consisting of C-60 and 1,2-diaminoethane were easily fabricated on an electrode by an alternate immersion process. Formation of the C-60 -diamine adduct films were confirmed using transmission absorption spectroscopy and atomic force microscopy. An inverted-type organic solar cells were fabricated by using the C-60 -diamine adduct film as the electron transport layer. The resultant photoelectric conversation performance of the solar cells suggested that photocurrent is generated via the photoexcitation of polythiophene. The result suggests that the present insoluble fullerene-diamine adduct films worked as buffer layer for organic thin-film solar cells.

DOI： 10.1063/1.4974799

Web of Science

Fabrication and Characterization of Perovskite Photovoltaic Devices with TiO2 Nanoparticle Layers Reviewed

Takeo Oku, Naoki Ueoka, Kohei Suzuki, Atsushi Suzuki, Masahiro Yamada, Hiroki Sakamoto, Satoshi Minami, Sakiko Fukunishi, Kazufumi Kohno, Shinsuke Miyauchi

IRAGO CONFERENCE 2016: 360 DEGREE OUTLOOK ON CRITICAL SCIENTIFIC AND TECHNOLOGICAL CHALLENGES FOR A SUSTAINABLE SOCIETY 1807 020014 2017

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

TiO2/CH3NH3PbI3-based photovoltaic devices were fabricated by a spin-coating method using mixture solutions with TiO2 nanoparticles. Compact TiO2 layers were prepared from titanium diisopropoxide bis(acetyl acetonate) and TiO2 nanoparticles with different particle sizes. The performance of the photovoltaic devices was improved by sequential deposition of the TiO2 layers, which resulted in microstructural change of the perovskite layers.

DOI： 10.1063/1.4974796

Web of Science

Effects of halogen doping on the photovoltaic properties of HC(NH2)(2)PbI3 perovskite solar cells Reviewed

Yuri Umemoto, Atsushi Suzuki, Takeo Oku

IRAGO CONFERENCE 2016: 360 DEGREE OUTLOOK ON CRITICAL SCIENTIFIC AND TECHNOLOGICAL CHALLENGES FOR A SUSTAINABLE SOCIETY 1807 020011 2017

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

Fabrication and characterization of perovskite-based solar cell using TiO2 as an electron transporting layer and 2,2',7,7'-tetrakis-(N,N-di-4-methoxyphenylamino) -9,9'-spirobifluorene as a hole transporting layer (HTL) have been performed for improving the photovoltaic performance. The purpose of the present study is to investigate a role of halogen doping using iodine, bromine and chlorine compounds on the photovoltaic performance such as short-circuit current density, open-circuit voltage, conversion efficiency and microstructures of HC(NH2)(2)PbI3-x-yBrxCly perovskite solar cells. The photovoltaic properties were investigated by current-voltage curves under light irradiation, incident photon to current conversion efficiency, X-ray diffraction and optical microscopy. The photovoltaic performance and optical properties were influenced by halogen addition into the perovskite crystal structure

DOI： 10.1063/1.4974793

Web of Science

Fabrication and characterization of CH3NH3(Cs)Pb(Sn)I-3(Br) perovskite solar cells Reviewed

Naoki Ueoka, Yuya Ohishi, Yasuhiro Shirahata, Atsushi Suzuki, Takeo Oku

IRAGO CONFERENCE 2016: 360 DEGREE OUTLOOK ON CRITICAL SCIENTIFIC AND TECHNOLOGICAL CHALLENGES FOR A SUSTAINABLE SOCIETY 1807 020009 2017

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

Perovskite-type CH3NH3(MA)PbI3-based photovoltaic devices were fabricated and characterized. Doping effects of cesium iodide (CsI), cesium bromide (CsBr) and tin bromide (SnBr2) on the photovoltaic properties and surface microstructures of the perovskite phase were investigated. Short-circuit current densities, open-circuit voltages and fill factors increased by CsI and SnBr2 addition. The surface coverage of the perovskite crystals was also improved by SnBr2 doping, which resulted in improvement of the fill factor. The cell prepared by a starting composition of MA(0.95)Cs(0.05)Pb(0.95)Sn(0.05)I(2.90)Br(0.10) showed the best photovoltaic performance in the present work.

DOI： 10.1063/1.4974791

Web of Science

Effects of SbBr3 Addition to CH3NH3PbI3 Solar Cells Reviewed

Takeo Oku, Yuya Ohishi, Atsushi Suzuki

IRAGO CONFERENCE 2016: 360 DEGREE OUTLOOK ON CRITICAL SCIENTIFIC AND TECHNOLOGICAL CHALLENGES FOR A SUSTAINABLE SOCIETY 1807 ( 020007 ) 1 - 5 2017

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

TiO2/CH3NH3Pb1-xSbxI3-2xBr3x-based photovoltaic devices were fabricated, and effects of SbBr3 addition to CH3NH3PbI3 precursor solutions on the photovoltaic properties were investigated. The short-circuit current densities and photoconversion efficiencies were improved by adding a small amount of SbBr3 to the perovskite phase, which would be due to a doping effect of Sb or Br atoms at the Pb or I sites.

DOI： 10.1063/1.4974789

Web of Science

Effects of polysilane-doped spiro-OMeTAD hole transport layers on photovoltaic properties Reviewed International journal

Yasuhiro Shirahata, Yuki Yamomoto, Atsushi Suzuki, Takeo Oku, Sakiko Fukunishi, and Kazufumi Kohno

Phys. Status Solidi A 1600591 2016.11

Effects of central metal on electronic structure, magnetic properties, infrared and Raman spectra of double-decker phthalocyanine Reviewed International journal

Atsushi Suzuki, Takeo Oku

Applied Surface Science 380 127 - 134 2016.9

Effects of central metal on electronic structure, magnetic properties, infrared and Raman spectra of double-decker phthalocyanine Reviewed

Atsushi Suzuki, Takeo Oku

APPLIED SURFACE SCIENCE 380 127 - 134 2016.9

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

The effects of the central metal in double-decker metal phthalocyanine on the electronic structure, magnetic properties, and infrared and Raman spectra of the complex were investigated. Electron density distributions were delocalized on the phthalocyanine rings. The narrow energy gap and infrared peaks observed in the ultra-violet-visible-near infrared spectra of the systems were attributed to phthalocyanine ring-ring interactions the between overlapping pi-orbitals on each ring. The chemical shift behavior of the phthalocyanine rings was separated by the deformation of their structure owing to nuclear magnetic interaction of the nuclear quadrupole interaction as determined by the electronic field gradient and asymmetric parameters. The magnetic parameters of principle g-tensors were dependent on the perturbation of the crystal field by the hybridization of the d-spin in the central metal conjugated with nitrogen ligands. In the case of the vanadyl system, the IR vibration modes were shifted by the soft vibration mode for resolving the symmetrical structure. Inactive Raman vibration modes arose from no-polarization on the phthalocyanine rings. Double-decker metal phthalocyanines have great advantages for the control of the magnetic mechanism for quantum spin entanglement in the relaxation process. (C) 2016 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.apsusc.2016.02.026

Web of Science

Effects of Cl Addition to Sb-Doped Perovskite-Type CH3NH3PbI3 Photovoltaic Devices Reviewed International journal

Takeo Oku, Yuya Ohishi, Atsushi Suzuki and Yuzuru Miyazawa

Metals 6 ( 7 ) 147-1 - 147-3 2016.6

Effects of Cl Addition to Sb-Doped Perovskite-Type CH3NH3PbI3 Photovoltaic Devices Reviewed

Takeo Oku, Yuya Ohishi, Atsushi Suzuki, Yuzuru Miyazawa

Metals 6 ( 7 ) 147-1 - 147-3 2016.6

Fabrication and characterization of bismuth ferrite as an electron transport layer in perovskite photovoltaic devices Reviewed International journal

Yasuhiro SHIRAHATA, Atsushi SUZUKI, Takeo OKU

Journal of the Ceramic Society of Japan 124 ( 5 ) 602 - 605 2016.5

Fabrication and Characterization of CH3NH3PbI3-x-yBrxCly Perovskite Solar Cells Reviewed International journal

Atsushi Suzuki, Hiroshi Okada and Takeo Oku

Energies 9 ( 5 ) 376-1 - 376-11 2016.5

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Papers - SUZUKI Atsushi