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Charge Carrier Trapping during Diffusion Generally Observed for Particulate Photocatalytic Films

Author

Listed:
  • Kenji Katayama

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

  • Tatsuya Chugenji

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

  • Kei Kawaguchi

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

Abstract

Photo-excited charge carriers play a vital role in photocatalysts and photovoltaics, and their dynamic processes must be understood to improve their efficiencies by controlling them. The photo-excited charge carriers in photocatalytic materials are usually trapped to the defect states in the picosecond time range and are subject to recombination to the nanosecond to microsecond order. When photo-excited charge carrier dynamics are observed via refractive index changes, especially in particulate photocatalytic materials, another response between the trapping and recombination phases is often observed. This response has always provided the gradual increase of the refractive index changes in the nanosecond order, and we propose that the shallowly trapped charge carriers could still diffuse and be trapped to other states during this process. We examined various photocatalytic materials such as TiO 2 , SrTiO 3 , hematite, BiVO 4 , and methylammonium lead iodide for similar rising responses. Based on our assumption of surface trapping with diffusion, the responses were fit with the theoretical model with sufficient accuracy. We propose that these slow charge trapping processes must be included to fully understand the charge carrier dynamics of particulate photocatalytic materials.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:21:p:7011-:d:664801
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    References listed on IDEAS

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    1. Makoto Ebihara & Takeshi Ikeda & Sayuri Okunaka & Hiromasa Tokudome & Kazunari Domen & Kenji Katayama, 2021. "Charge carrier mapping for Z-scheme photocatalytic water-splitting sheet via categorization of microscopic time-resolved image sequences," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
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    Cited by:

    1. 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.

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