Unraveling exciton–phonon coupling in individual FAPbI3 nanocrystals emitting near-infrared single photons

Abstract : Formamidinium lead iodide (FAPbI3) exhibits the narrowest bandgap energy among lead halide perovskites, thus playing a pivotal role for the development of photovoltaics and near-infrared classical or quantum light sources. Here, we unveil the fundamental properties of FAPbI3 by spectroscopic investigations of nanocrystals of this material at the single-particle level. We show that these nanocrystals deliver near-infrared single photons suitable for quantum communication. Moreover, the low temperature photoluminescence spectra of FAPbI3 nanocrystals reveal the optical phonon modes responsible for the emission line broadening with temperature and a vanishing exciton–acoustic phonon interaction in these soft materials. The photoluminescence decays are governed by thermal mixing between fine structure states, with a two-optical phonon Raman scattering process. These results point to a strong Frölich interaction and to a phonon glass character that weakens the interactions of charge carriers with acoustic phonons and thus impacts their relaxation and mobility in these perovskites.
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Nature Communications, Nature Publishing Group, 2018, 9, pp.3318. 〈10.1038/s41467-018-05876-0〉
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https://hal.archives-ouvertes.fr/hal-01858261
Contributeur : Jacky Even <>
Soumis le : lundi 20 août 2018 - 12:38:56
Dernière modification le : mardi 5 mars 2019 - 09:32:53

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Ming Fu, Philippe Tamarat, Jean-Baptiste Trebbia, Maryna Bodnarchuk, Maksym Kovalenko, et al.. Unraveling exciton–phonon coupling in individual FAPbI3 nanocrystals emitting near-infrared single photons. Nature Communications, Nature Publishing Group, 2018, 9, pp.3318. 〈10.1038/s41467-018-05876-0〉. 〈hal-01858261〉

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