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Hot-exciton effects on exciton diffusion and circular polarization dynamics in a single PbI2 nanoflake

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Abstract

As one of the emerging two-dimensional lead halide materials, lead iodide (PbI2) nanosheets have proven to possess strong application potential in the fields of high-energy radiation detection and highly efficient perovskite solar cells. However, the underlying photophysical properties such as hot-exciton-related carrier dynamics remain unclear for PbI2 nanosheets. Here, we report the exciton dynamics of a single PbI2 nanoflake prepared by an aqueous solution method. Through a three-dimensional (3D) diffusion model, we obtain the exciton annihilation radius and diffusion coefficient of a single PbI2 nanoflake under non-resonant and resonant excitation conditions of band-edge exciton state. As initial exciton densities increase, we find the carrier recombination mechanism for a single PbI2 nanoflake gradually changes from exciton-exciton annihilation to free-carrier recombination. Finally, we reveal the room-temperature circular polarization of a single PbI2 nanoflake is due to free-carrier recombination with a band-edge exciton dissociation time of ~120 fs under the resonant excitation condition.

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Authors and Affiliations

  1. State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China

    ChenYu Xu, Lei Wang, Lin Cui, BingRong Gao & HaiYu Wang

Authors
  1. ChenYu Xu
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  2. Lei Wang
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  3. Lin Cui
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  4. BingRong Gao
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  5. HaiYu Wang
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Corresponding author

Correspondence to Lei Wang.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant Nos. 62175088, 61927814, 21773087, 21603083 & 21903035) and China Postdoctoral Science Foundation (Grant No. 2016M590259).

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Xu, C., Wang, L., Cui, L. et al. Hot-exciton effects on exciton diffusion and circular polarization dynamics in a single PbI2 nanoflake. Sci. China Technol. Sci. 67, 83–90 (2024). https://doi.org/10.1007/s11431-022-2249-1

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  • DOI: https://doi.org/10.1007/s11431-022-2249-1

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