The enhancement of excitonic emission crossing Saha equilibrium in trap passivated CH3NH3PbBr3 perovskite. Mariano, F.; Cretì, A.; Carbone, L.; Genco, A.; D’Agostino, S.; Carallo, S.; Montagna, G.; Lomascolo, M.; and Mazzeo, M. Communications Physics, Nature Research, 2020. cited By 1
The enhancement of excitonic emission crossing Saha equilibrium in trap passivated CH3NH3PbBr3 perovskite [link]Paper  doi  abstract   bibtex   
Metal-halide semiconductor perovskites have received great attention for the development of stable and efficient light emitting diodes and lasers, since they combine high charge carrier mobility and light emission spectral-purity with low-cost fabrication methods. Nevertheless, the role of excitons, free carries and trap states in perovskite light emission properties is still unclear due to their interdependence. In this paper we selectively manage trapping and light emission mechanisms by a reversible laser-assisted trap-passivation process performed on a CH3NH3PbBr3 perovskite layer, coupled to the inner modes of a high-quality micro-cavity, which only affects the radiative recombination. We show that photoluminescence is dominated by exciton radiative decay process and that trap states passivation increases the exciton gemination rate by reducing coulombic scattering of free electrons due to the ionized impurities. This picture provides a more general description than the model based on trap states-free Saha thermodynamic equilibrium between photo-generated species. © 2020, The Author(s).
@ARTICLE{Mariano2020,
author={Mariano, F. and Cretì, A. and Carbone, L. and Genco, A. and D’Agostino, S. and Carallo, S. and Montagna, G. and Lomascolo, M. and Mazzeo, M.},
title={The enhancement of excitonic emission crossing Saha equilibrium in trap passivated CH3NH3PbBr3 perovskite},
journal={Communications Physics},
year={2020},
volume={3},
number={1},
doi={10.1038/s42005-020-0309-3},
art_number={41},
note={cited By 1},
url={https://www.scopus.com/inward/record.uri?eid=2-s2.0-85080126608&doi=10.1038%2fs42005-020-0309-3&partnerID=40&md5=103c65948d22d9a2a05f5a35f3e8fb7b},
abstract={Metal-halide semiconductor perovskites have received great attention for the development of stable and efficient light emitting diodes and lasers, since they combine high charge carrier mobility and light emission spectral-purity with low-cost fabrication methods. Nevertheless, the role of excitons, free carries and trap states in perovskite light emission properties is still unclear due to their interdependence. In this paper we selectively manage trapping and light emission mechanisms by a reversible laser-assisted trap-passivation process performed on a CH3NH3PbBr3 perovskite layer, coupled to the inner modes of a high-quality micro-cavity, which only affects the radiative recombination. We show that photoluminescence is dominated by exciton radiative decay process and that trap states passivation increases the exciton gemination rate by reducing coulombic scattering of free electrons due to the ionized impurities. This picture provides a more general description than the model based on trap states-free Saha thermodynamic equilibrium between photo-generated species. © 2020, The Author(s).},
publisher={Nature Research},
issn={23993650},
document_type={Article},
source={Scopus},
}
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