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Photo-induced enhancement of lattice fluctuations in metal-halide perovskites

Author

Listed:
  • Mingcong Wang

    (Material Science and Engineering Program (MSE))

  • Yajun Gao

    (Material Science and Engineering Program (MSE))

  • Kai Wang

    (Material Science and Engineering Program (MSE))

  • Jiang Liu

    (Material Science and Engineering Program (MSE))

  • Stefaan De Wolf

    (Material Science and Engineering Program (MSE))

  • Frédéric Laquai

    (Material Science and Engineering Program (MSE))

Abstract

The optoelectronic properties of metal-halide perovskites (MHPs) are affected by lattice fluctuations. Using ultrafast pump-probe spectroscopy, we demonstrate that in state-of-the-art mixed-cation MHPs ultrafast photo-induced bandgap narrowing occurs with a linear to super-linear dependence on the excited carrier density ranging from 1017 cm−3 to above 1018 cm−3. Time-domain terahertz spectroscopy reveals carrier localization increases with carrier density. Both observations, the anomalous dependence of the bandgap narrowing and the increased carrier localization can be rationalized by photo-induced lattice fluctuations. The magnitude of the photo-induced lattice fluctuations depends on the intrinsic instability of the MHP lattice. Our findings provide insight into ultrafast processes in MHPs following photoexcitation and thus help to develop a concise picture of the ultrafast photophysics of this important class of emerging semiconductors.

Suggested Citation

  • Mingcong Wang & Yajun Gao & Kai Wang & Jiang Liu & Stefaan De Wolf & Frédéric Laquai, 2022. "Photo-induced enhancement of lattice fluctuations in metal-halide perovskites," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28532-0
    DOI: 10.1038/s41467-022-28532-0
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    1. Christopher L. Davies & Marina R. Filip & Jay B. Patel & Timothy W. Crothers & Carla Verdi & Adam D. Wright & Rebecca L. Milot & Feliciano Giustino & Michael B. Johnston & Laura M. Herz, 2018. "Bimolecular recombination in methylammonium lead triiodide perovskite is an inverse absorption process," Nature Communications, Nature, vol. 9(1), pages 1-9, December.
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