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Robust excitonic light emission in 2D tin halide perovskites by weak excited state polaronic effect

Author

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  • Hongzhi Zhou

    (Zhejiang University)

  • Qingjie Feng

    (Zhejiang Normal University)

  • Cheng Sun

    (Zhejiang University
    ZJU-Hangzhou Global Scientific and Technological Innovation Center)

  • Yahui Li

    (Westlake University)

  • Weijian Tao

    (Zhejiang University)

  • Wei Tang

    (College of Optical Science and Engineering)

  • Linjun Li

    (College of Optical Science and Engineering)

  • Enzheng Shi

    (Westlake University)

  • Guangjun Nan

    (Zhejiang Normal University)

  • Haiming Zhu

    (Zhejiang University
    ZJU-Hangzhou Global Scientific and Technological Innovation Center)

Abstract

2D perovskites hold immense promise in optoelectronics due to their strongly bound electron-hole pairs (i.e., excitons). While exciton polaron from interplay between exciton and lattice has been established in 2D lead-based perovskites, the exciton nature and behavior in the emerging 2D tin-based perovskites remains unclear. By combining spin-resolved ultrafast spectroscopy and sophisticated theoretical calculations, we reveal 2D tin-based perovskites as genuine excitonic semiconductors with weak polaronic screening effect and persistent Coulomb interaction, thanks to weak exciton-phonon coupling. We determine an excited state exciton binding energy of ~0.18 eV in n = 2 tin iodide perovskites, nearly twice of that in lead counterpart, despite of same large value of ~0.2 eV from steady state measurement. This finding emphasizes the pivotal role of excited state polaronic effect in these materials. The robust excitons in 2D tin-based perovskites exhibit excitation power-insensitive, high-efficiency and color-purity emission, rendering them superior for light-emitting applications.

Suggested Citation

  • Hongzhi Zhou & Qingjie Feng & Cheng Sun & Yahui Li & Weijian Tao & Wei Tang & Linjun Li & Enzheng Shi & Guangjun Nan & Haiming Zhu, 2024. "Robust excitonic light emission in 2D tin halide perovskites by weak excited state polaronic effect," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-52952-9
    DOI: 10.1038/s41467-024-52952-9
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