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    Impact of Cesium/Rubidium Incorporation on the Photophysics of Multiple-Cation Lead Halide Perovskites

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    Type
    Article
    Authors
    Gao, Yajun
    Wang, Kai
    Wang, Mingcong cc
    Khan, Jafar Iqbal
    Balawi, Ahmed cc
    Liu, Wenzhu
    De Wolf, Stefaan cc
    Laquai, Frédéric cc
    KAUST Department
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    OSR-2018-CARF/CCF-3079
    Date
    2020-04-17
    Online Publication Date
    2020-04-17
    Print Publication Date
    2020-06
    Submitted Date
    2020-02-06
    Permanent link to this record
    http://hdl.handle.net/10754/662494
    
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    Abstract
    Incorporating cesium (Cs) or rubidium (Rb) cations into multiple-cation lead mixed-halide perovskites (FA0.83MA0.17Pb(I0.83Br0.17)3) increases their photovoltaic performance. In this study, the fundamental photophysics of perovskites are investigated by steady-state and transient optical spectroscopy and the reasons for the performance increase are revealed. Cs/Rb-cation incorporation slightly increases the bandgap, while exciton binding energies remain in the range of a few meV. Urbach energies are reduced, suggesting improved perovskite microstructure upon Cs/Rb incorporation. Carrier density-induced broadening of the photo-bleaching following the Burstein-Moss model is observed, and the effective carrier masses are determined to be a few tenths of the electron rest mass. From fits of the high-energy tail of the perovskite's photo bleach to Boltzmann's distribution, sub-picosecond hot carrier cooling is revealed, implying strong carrier-phonon coupling. Importantly, the charge carrier recombination dynamics indicate that Cs/Rb-incorporation reduces both the first-order (trap-assisted) and the second-order (radiative) recombination, which appears to be the main reason for the observed performance increase upon Cs/Rb-cation incorporation. Overall, this work presents a detailed study of the photophysics of multiple-cation mixed halide lead perovskites and develops a concise picture of the impact of cesium/rubidium incorporation on the photophysics and device performance.
    Citation
    Gao, Y., Wang, K., Wang, M., Khan, J. I., Balawi, A., Liu, W., … Laquai, F. (2020). Impact of Cesium/Rubidium Incorporation on the Photophysics of Multiple-Cation Lead Halide Perovskites. Solar RRL. doi:10.1002/solr.202000072
    Sponsors
    This publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No: OSR-2018-CARF/CCF-3079. Yajun Gao and Kai Wang contributed equally to this work
    Publisher
    Wiley
    Journal
    Solar RRL
    DOI
    10.1002/solr.202000072
    Additional Links
    http://doi.wiley.com/10.1002/solr.202000072
    ae974a485f413a2113503eed53cd6c53
    10.1002/solr.202000072
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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