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Separation of surface and bulk recombination velocities of carriers in SrTiO3 for optimization of photocatalytic performance

Research Project

Project/Area Number 21H01828
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 30010:Crystal engineering-related
Research InstitutionNagoya Institute of Technology

Principal Investigator

Kato Masashi  名古屋工業大学, 工学(系)研究科(研究院), 教授 (80362317)

Co-Investigator(Kenkyū-buntansha) 潘 振華  中央大学, 理工学部, 助教 (90870551)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥16,250,000 (Direct Cost: ¥12,500,000、Indirect Cost: ¥3,750,000)
Fiscal Year 2023: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2022: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥10,400,000 (Direct Cost: ¥8,000,000、Indirect Cost: ¥2,400,000)
KeywordsSrTiO3 / キャリア再結合 / 表面 / 光触媒 / 酸化物 / キャリア / 再結合 / 結晶
Outline of Research at the Start

太陽光を化学的エネルギーに変換する人工光合成技術を実現する一つの有力な手法として、半導体光触媒を用いた水分解反応が提案されている。特に近年、SrTiO3をベースとした高効率水分解光触媒が発表されている。その一方で、光触媒の外部量子効率に影響を与える主要なファクターである光励起キャリアの振る舞いについては、定量的な実験値の報告が少なく、実質的にシミュレーションによる予測に頼っているのが現状である。そこで本研究では我々がSiCで定量化してきた内部と表面の再結合速度分離評価技術により、様々な面方位のSrTiO3での表面再結合速度を定量し、SrTiO3光触媒の最適設計に資する。

Outline of Final Research Achievements

In this study, we succeeded in quantifying the surface recombination velocity of SrTiO3 and separated it from bulk recombination. Furthermore, by using angle-lapped SrTiO3, the surface recombination velocities and bulk carrier lifetime were successfully determined with high accuracy. The results also showed that the CoOx support does not affect the surface recombination of SrTiO3, while the dislocations generated by the machining process form traps on the surface and reduce the photocatalytic performance of SrTiO3. We believe that our results are sufficient to achieve our goal of separating and quantifying surface and internal recombination, which is necessary for material design to improve the energy conversion efficiency of SrTiO3 photocatalysts.

Academic Significance and Societal Importance of the Research Achievements

光触媒は太陽光を水素などのエネルギー資源に変換可能な材料であり、将来的に社会へ再生可能エネルギーを供給するキーマテリアルである。本研究では光触媒として実績のあるSrTiO3を対象に、光触媒構造を最適化するための表面・バルク再結合を定量した。これは従来の光触媒設計において、検討されてこなかった物性値であり、半導体物理を光触媒に適用し学理を解明したという学術的意義を有している。また上記のように、将来社会へのエネルギー供給技術としての可能性もある成果であり、十分な社会的意義を示すものである。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • Research Products

    (13 results)

All 2024 2023 2022 2021 Other

All Int'l Joint Research (1 results) Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (8 results) (of which Int'l Joint Research: 5 results,  Invited: 2 results) Remarks (1 results)

  • [Int'l Joint Research] Friedrich-Alexander-Universitat(ドイツ)

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Effect of dislocations on carrier recombination and photoelectrochemical activity in polished and unpolished TiO2 and SrTiO3 crystals2024

    • Author(s)
      Endong Zhang, Mingxin Zhang, Masashi Kato
    • Journal Title

      Journal of Applied Physics

      Volume: 135 Issue: 4

    • DOI

      10.1063/5.0181625

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Estimation of surface recombination velocities and bulk carrier lifetime for SrTiO3 using angle-lapped structures2022

    • Author(s)
      Masashi Kato, Yosuke Kato
    • Journal Title

      Chemical Physics Letters

      Volume: 805 Pages: 139955-139955

    • DOI

      10.1016/j.cplett.2022.139955

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Carrier recombination in SrTiO3 single crystals: impacts of crystal faces and Nb doping2021

    • Author(s)
      Masashi Kato, Takaya Ozawa, Yoshihito Ichikawa
    • Journal Title

      Journal of Physics D: Applied Physics

      Volume: 54 Issue: 34 Pages: 345106-345106

    • DOI

      10.1088/1361-6463/ac073e

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Presentation] CeO2単結晶中のキャリア再結合を支配する欠陥の分析2024

    • Author(s)
      Zhang Endong、Brabec Christoph、加藤 正史
    • Organizer
      2024年第71回応用物理学会春季学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Analysis of defects dominating carrier recombination in CeO2 single crystal for photocatalytic applications2023

    • Author(s)
      Endong Zhang, Masashi KATO
    • Organizer
      2023 International Conference on Solid State Devices and Materials
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effects of polishing on carrier recombination in TiO2 and SrTiO3 single crystals2023

    • Author(s)
      Masashi Kato
    • Organizer
      E-MRS 2023 Spring Meeting
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] TiO2およびSrTiO3単結晶のキャリア再結合に表面研磨処理が及ぼす影響2023

    • Author(s)
      Zhang Mingxin、張 恩棟、加藤 正史
    • Organizer
      2023年第70回応用物理学会春季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Accurate estimation of surface recombination velocities for SrTiO3 using angle-lapped structures2022

    • Author(s)
      Masashi Kato, Yosuke Kato
    • Organizer
      2022 International Conference on Solid State Devices and Materials
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Single Crystal Photocatalytic Oxides: Carrier Recombination and Solar-to-hydrogen Conversion2022

    • Author(s)
      Masashi Kato
    • Organizer
      9th International Symposium on Control of Semiconductor Interfaces
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 斜め研磨構造を利用したSrTiO3表面再結合速度の高精度評価2022

    • Author(s)
      加藤遥介、加藤正史
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Estimation of surface recombination velocities of SrTiO3 for optimum structures as a photocatalyst2021

    • Author(s)
      Masashi Kato, Takaya Ozawa, Yoshihito Ichikawa
    • Organizer
      2021 International Conference on Solid State Devices and Materials
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Remarks] Paving the Way to Artificial Photosynthesis

    • URL

      https://www.nitech.ac.jp/eng/news/2021/9047.html

    • Related Report
      2021 Annual Research Report

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Published: 2021-04-28   Modified: 2025-01-30  

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