KINDAI UNIVERSITY


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MATSUMOTO Kouichi

Profile

FacultyDepartment of Science / Graduate School of Science and Engineering Research
PositionAssociate Professor
Degree
Commentator Guidehttps://www.kindai.ac.jp/meikan/382-matsumoto-kouichi.html
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Last Updated :2020/04/03

Education and Career

Academic & Professional Experience

  •   2019 04 ,  - 現在, Faculty of Science and Engineering, Kindai University
  •   2014 , Faculty of Science and Engineering, Kindai University

Research Activities

Research Areas

  • Life sciences, Bioorganic chemistry
  • Nanotechnology/Materials, Structural/physical organic chemistry

Published Papers

  • Electrochemical Methods as Enabling Tools for Glycosylation, Asian Journal of Organic Chemistry, Asian Journal of Organic Chemistry, in press, 2018 , Refereed
  • Theoretical study on steric deconjugation of poly(3-hexylthiophene) through bromination, Hideo Ando, Senku Tanaka, Kouichi Matsumoto, Yoshihide Nakao, CHEMICAL PHYSICS LETTERS, CHEMICAL PHYSICS LETTERS, 687, 60 - 65, Nov. 2017 , Refereed
    Summary:In poly(3-hexylthiophene) (P3HT), it is suggested that bromination disturbs the pi conjugation and reduces the carrier mobility. To investigate the deconjugation mechanism, we theoretically studied a key flexibility of the Br-P3HT backbone, namely inter-ring S-C-C-S dihedral torsion, in terms of potential energy curve, geometry-based aromaticity index, and decomposed energies of inter-monomer interaction. The linkage between bromination and the excitation energy was also investigated. We concluded that steric repulsion due to bulky bromo group can cause out-of-plane S-C-C-S torsion of Br-P3HT and consequent shortening of the conjugation length, not electronic substituent effect, leads to blue shift of the S-0 -> S-1 excitation energy. (C) 2017 Elsevier B.V. All rights reserved.
  • Effects of bromination of poly(3-hexylthiophene) on the performance of bulk heterojunction solar cells, Senku Tanaka, Siti Khadijah Binti Rosli, Ken Takada, Norito Taniai, Takuya Yoshitomi, Hideo Ando, Kouichi Matsumoto, RSC ADVANCES, RSC ADVANCES, 7(74), 46874 - 46880, 2017 , Refereed
    Summary:We examined the effects of delocalized pi-electrons in poly(3-hexylthiophene) (P3HT) on the photovoltaic properties of a bulk heterojunction (BHJ) solar cell. The pi-conjugated length of P3HT was controlled by modification of P3HT through partial bromination at the 4-position of thiophene units. We investigated correlation between the degree of P3HT bromination (2, 11, 22, 37, 66, 84, 100%) and the photovoltaic properties of Br-P3HT:phenyl-C-61-butyric acid methyl ester (PCBM) BHJ solar cells. The power conversion efficiency of the 11% Br-P3HT:PCBM solar cell decreased to 56% of that of a pristine P3HT:PCBM solar cell. The main factor contributing to this decrease was lower short circuit currents. The photo absorption spectrum and the X-ray diffraction pattern of the 11% Br-P3HT film showed only slight differences to those of pristine P3HT, indicating the interchain pi-stacking of the polymers was almost unaffected by the 11% bromination. These results suggest that an intrachain pi-conjugation across more than 10 thiophene rings in the P3HT backbone is necessary to realize efficient charge transport in polymer domains. The 37% Br-P3HT:PCBM cell showed only weak photovoltaic properties; both inter- and intrachain delocalization of pi-electrons were disturbed by bromination.