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Ultrafast Charge Carrier Relaxation in Inorganic Halide Perovskite Single Crystals Probed by Two-Dimensional Electronic Spectroscopy

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    Ultrafast Charge Carrier Relaxation in Inorganic Halide Perovskite Single Crystals Probed by Two-Dimensional Electronic Spectroscopy
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    The Journal of Physical Chemistry Letters

    Cite this: J. Phys. Chem. Lett. 2019, 10, 18, 5414–5421
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    https://doi.org/10.1021/acs.jpclett.9b01936
    Published August 26, 2019
    Copyright © 2019 American Chemical Society
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    Abstract

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    Halide perovskites are promising optoelectronic materials. Despite impressive device performance, especially in photovoltaics, the femtosecond dynamics of elementary optical excitations and their interactions are still debated. Here we combine ultrafast two-dimensional electronic spectroscopy (2DES) and semiconductor Bloch equations (SBEs) to probe the room-temperature dynamics of nonequilibrium excitations in CsPbBr3 crystals. Experimentally, we distinguish between excitonic and free-carrier transitions, extracting a ∼30 meV exciton binding energy, in agreement with our SBE calculations and with recent experimental studies. The 2DES dynamics indicate remarkably short, <30 fs carrier relaxation at a ∼3 meV/fs rate, much faster than previously anticipated for this material, but similar to that in direct band gap semiconductors such as GaAs. Dynamic screening of excitons by free carriers also develops on a similarly fast <30 fs time scale, emphasizing the role of carrier–carrier interactions for this material’s optical properties. Our results suggest that strong electron–phonon couplings lead to ultrafast relaxation of charge carriers, which, in turn may limit halide perovskites’ carrier mobilities.

    Copyright © 2019 American Chemical Society

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.jpclett.9b01936.

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    This article is cited by 18 publications.

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    The Journal of Physical Chemistry Letters

    Cite this: J. Phys. Chem. Lett. 2019, 10, 18, 5414–5421
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.jpclett.9b01936
    Published August 26, 2019
    Copyright © 2019 American Chemical Society
    Request reuse permissions

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