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Local Charge Carrier Dynamics for Photocatalytic Materials Using Pattern-Illumination Time-Resolved Phase Microscopy

Author

Listed:
  • Kenji Katayama

    (Department of Applied Chemistry, Chuo University, Tokyo 112-8551, Japan)

  • Kei Kawaguchi

    (Department of Applied Chemistry, Chuo University, Tokyo 112-8551, Japan)

  • Yuta Egawa

    (Department of Applied Chemistry, Chuo University, Tokyo 112-8551, Japan)

  • Zhenhua Pan

    (Department of Applied Chemistry, Chuo University, Tokyo 112-8551, Japan)

Abstract

We showed two demonstrations of the local charge carrier dynamics measurements of photocatalytic materials using our recently developed time-resolved phase-contrast microscopic technique combined with the clustering analyses. In this microscopic time-resolved technique, we observed the charge carrier dynamics via the refractive index change instead of the luminescence or absorption change, where we could often observe non-radiative charge carrier processes such as charge carrier trapping and non-radiative relaxation. By the clustering analyses of all the pixel-by-pixel responses, we could extract various different charge carrier dynamics because photocatalytic materials have inhomogeneity on surfaces and the charge carrier behavior depends on the local structure and species. Even for typical photocatalytic materials, titanium oxide and hematite, we could recognize various charge carrier dynamics, which cannot be differentiated by the general fitting procedure for the averaged time response. We could categorize the surface-trapped charge carriers (holes and electrons) and bulk carriers in the nanosecond to millisecond order, which indicates that this analytical procedure will play an important role in understanding the charge carrier dynamics for various photocatalytic materials.

Suggested Citation

  • Kenji Katayama & Kei Kawaguchi & Yuta Egawa & Zhenhua Pan, 2022. "Local Charge Carrier Dynamics for Photocatalytic Materials Using Pattern-Illumination Time-Resolved Phase Microscopy," Energies, MDPI, vol. 15(24), pages 1-13, December.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:24:p:9578-:d:1006307
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    References listed on IDEAS

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    2. Tsuyoshi Takata & Junzhe Jiang & Yoshihisa Sakata & Mamiko Nakabayashi & Naoya Shibata & Vikas Nandal & Kazuhiko Seki & Takashi Hisatomi & Kazunari Domen, 2020. "Photocatalytic water splitting with a quantum efficiency of almost unity," Nature, Nature, vol. 581(7809), pages 411-414, May.
    3. Kenji Katayama & Tatsuya Chugenji & Kei Kawaguchi, 2021. "Charge Carrier Trapping during Diffusion Generally Observed for Particulate Photocatalytic Films," Energies, MDPI, vol. 14(21), pages 1-10, October.
    4. Kangqiang Li & Han Bao & Lixin Zhang, 2022. "Robust covariance estimation for distributed principal component analysis," Metrika: International Journal for Theoretical and Applied Statistics, Springer, vol. 85(6), pages 707-732, August.
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