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2019 Fiscal Year Research-status Report

Study of group-IVB metal doped BiVO4 thin-films for development of a highly efficient Z-Scheme photocatalyst

Research Project

Project/Area Number 18K05010
Research InstitutionUniversity of Tsukuba

Principal Investigator

ISLAM MONIRUL  筑波大学, 数理物質系, 助教 (30739719)

Co-Investigator(Kenkyū-buntansha) 櫻井 岳暁  筑波大学, 数理物質系, 准教授 (00344870)
池田 茂  甲南大学, 理工学部, 教授 (40312417)
Project Period (FY) 2018-04-01 – 2021-03-31
KeywordsBismuth Valadium Oxide / Photo-carrier dynamics / Sputtering / Photocatalytic activity / Recombination mechanism
Outline of Annual Research Achievements

1) Photo-carrier recombination in BiVO4 was studied using PL and time resolved photo-luminescence (TRPL). We developed a model showing that radiative recombination in BiVO4 occurs through donor-to-acceptor transition, while nonradiative recombination occurs through multiphonon emission via deep-level. Holes effective lifetimes was observed in nanosecond order, which is below calculated radiative lifetime.
2) Extended X-ray absorption fine structure (EXAFS) along with X-ray absorption near edge structure (XANES) suggests that Zr is incorporated as a substitute on Bi site in BiVO4 enhancing n-type conductivity.
3) TRPL suggests that Zr doping induces localized states in BiVO4.
4) Effect of O2 partial pressure was studied during sputtering of BiVO4.
5) Effect of Zr and Mo in BiVO4 was compared.

Current Status of Research Progress
Current Status of Research Progress

1: Research has progressed more than it was originally planned.

Reason

1) We could already established a model for the dominant photo-carrier recombination process in BiVO4, which has important implication for controlling the photocatalytic reactivity of this material.
2) Effect of excess Zr doping in formation of defect states has been confirmed using TRPL which was initially planned at third year.
3) Comparative fundamental study of doping with Zr and Mo has shown very important findings than initially estimated: We successfully established using EXAFS and XANES the doping site of Zr and Mo and their effect on carrier enhancement and photo-catalytic performances.
4) We were successful in getting BiVO4 thin film using just single sputtering target, which is a large step to scale up the production of photocatalytic device based on this material.

Strategy for Future Research Activity

1) To deposit monoclinic BiVO4 thin-films doped with Zr and Mo using sputtering technique from single target with large production scope.
2) Effect of composition (Bismuth-rich or Vanadium-rich) of sputtering target on deposited BiVO4 thin-films in view to obtain films with monoclinic crystalline phase with higher photo-catalytic activities.
3) Study of substrate materials on getting poly-crystal (using glass, FTO and Si-substrate) and single crystal (using SrTiO3, YSZ substrate) epitaxial BiVO4 films.
4) Crystal, optical and electrical properties of deposited BiVO4 using XRD, PL, TRPL, Raman, Hall method.
5) Carrier transport and charge transfer properties of BiVO4 using electro-chemical impedance analyzer.
6) Fabrication of hetaro-structure with BiVO4 films.

  • Research Products

    (7 results)

All 2020 2019

All Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results) Presentation (5 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Journal Article] Photocarrier Recombination Dynamics in BiVO4 for Visible-Light Driven Water Oxidation2020

    • Author(s)
      I. Abdellaoui, M.M. Islam, M. Remeika, Y. Higuchi, T. Kawaguchi, T. Harada, C. Budich, T. Maeda, T. Wada, S. Ikeda, and T. Sakurai
    • Journal Title

      J. Phys. Chem. C

      Volume: 124 Pages: 3962-3972

    • DOI

      https://doi.org/10.1021/acs.jpcc.9b10621

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Wavelength-dependent I-V characteristics of CuIn1-x Ga x (S,Se)2 solar cells and carrier recombination2019

    • Author(s)
      Alban Lafuente-Sampietro, Jingdong Chen, Shenghao Wang, Xia Hao, Muhammad Monirul Islam, Takuya Kato, Hiroki Sugimoto, Katsuhiro Akimoto, and Takeaki Sakurai
    • Journal Title

      Applied Physics Express

      Volume: 12 Pages: 061001-(1-6)

    • DOI

      https://doi.org/10.7567/1882-0786/ab1ad8

    • Peer Reviewed / Int'l Joint Research
  • [Presentation] RF スパッタリング法による BiVO4薄膜成長法の検討2020

    • Author(s)
      田島 和哉
    • Organizer
      第67回応用物理学会春季学術講演会
  • [Presentation] Study of BiVO4 photocatalysts for application as anodes in photoelectrochemical water splitting system2019

    • Author(s)
      Muhammad Monirul Islam
    • Organizer
      Tunisia-Japan Symposium on Science, Society and Technology (TJASSST 2019), Nov- 29- Dec 2, 2019
    • Int'l Joint Research / Invited
  • [Presentation] Recombination Mechanism in BiVO4 Photocatalyst Studied by Photoluminescence2019

    • Author(s)
      Imane Abdellaoui
    • Organizer
      The 80th JSAP Autumn Meeting 2019, September 18th -21th, 2019, Sapporo Campus, Hokkaido University, Japan
  • [Presentation] Study of Si-layers on graphite-substrates obtained through electrochemical reduction of silica powder2019

    • Author(s)
      Muhammad Monirul Islam
    • Organizer
      2019 International Conference on Solid State Devices and Materials (SSDM 2019), Sep 2-5, 2019
    • Int'l Joint Research
  • [Presentation] Microstructural investigation of Silicon films electrochemically deposited on carbon materials2019

    • Author(s)
      Said Hajer
    • Organizer
      Tunisia-Japan Symposium on Science, Society and Technology (TJASSST 2019), Nov- 29- Dec 2, 2019
    • Int'l Joint Research

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Published: 2021-01-27  

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