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Exciton dissociation in 2D layered metal-halide perovskites

Author

Listed:
  • Angelica Simbula

    (Università degli Studi di Cagliari)

  • Luyan Wu

    (Università degli Studi di Cagliari)

  • Federico Pitzalis

    (Università degli Studi di Cagliari)

  • Riccardo Pau

    (Università degli Studi di Cagliari
    University of Groningen)

  • Stefano Lai

    (Università degli Studi di Cagliari)

  • Fang Liu

    (Shanghai Jiao Tong University)

  • Selene Matta

    (Università degli Studi di Cagliari)

  • Daniela Marongiu

    (Università degli Studi di Cagliari)

  • Francesco Quochi

    (Università degli Studi di Cagliari)

  • Michele Saba

    (Università degli Studi di Cagliari)

  • Andrea Mura

    (Università degli Studi di Cagliari)

  • Giovanni Bongiovanni

    (Università degli Studi di Cagliari)

Abstract

Layered 2D perovskites are making inroads as materials for photovoltaics and light emitting diodes, but their photophysics is still lively debated. Although their large exciton binding energies should hinder charge separation, significant evidence has been uncovered for an abundance of free carriers among optical excitations. Several explanations have been proposed, like exciton dissociation at grain boundaries or polaron formation, without clarifying yet if excitons form and then dissociate, or if the formation is prevented by competing relaxation processes. Here we address exciton stability in layered Ruddlesden-Popper PEA2PbI4 (PEA stands for phenethylammonium) both in form of thin film and single crystal, by resonant injection of cold excitons, whose dissociation is then probed with femtosecond differential transmission. We show the intrinsic nature of exciton dissociation in 2D layered perovskites, demonstrating that both 2D and 3D perovskites are free carrier semiconductors and their photophysics is described by a unique and universal framework.

Suggested Citation

  • Angelica Simbula & Luyan Wu & Federico Pitzalis & Riccardo Pau & Stefano Lai & Fang Liu & Selene Matta & Daniela Marongiu & Francesco Quochi & Michele Saba & Andrea Mura & Giovanni Bongiovanni, 2023. "Exciton dissociation in 2D layered metal-halide perovskites," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-39831-5
    DOI: 10.1038/s41467-023-39831-5
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    References listed on IDEAS

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