The enhancement of excitonic emission crossing Saha equilibrium in trap passivated CH3NH3PbBr3 perovskite. Mariano, F.; Creti, A.; Carbone, L.; Genco, A.; D'Agostino, S.; Carallo, S.; Montagna, G.; Lomascolo, M.; and Mazzeo, M. COMMUNICATIONS PHYSICS, FEB 27, 2020.
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. The interdependence of free carries, trap states and excitons in the light emission properties of CH3NH3PbBr3 perovskite thin films and their relationship to device performance is a subject of debate. Here, the authors investigate the role of non-radiative recombination and demonstrate that the photoluminescence is dominated by exciton radiative decay processes.
@article{ ISI:000519376800001,
Author = {Mariano, Fabrizio and Creti, Arianna and Carbone, Luigi and Genco,
   Armando and D'Agostino, Stefania and Carallo, Sonia and Montagna,
   Giovanni and Lomascolo, Mauro and Mazzeo, Marco},
Title = {{The enhancement of excitonic emission crossing Saha equilibrium in trap
   passivated CH3NH3PbBr3 perovskite}},
Journal = {{COMMUNICATIONS PHYSICS}},
Year = {{2020}},
Volume = {{3}},
Number = {{1}},
Month = {{FEB 27}},
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.
   The interdependence of free carries, trap states and excitons in the
   light emission properties of CH3NH3PbBr3 perovskite thin films and their
   relationship to device performance is a subject of debate. Here, the
   authors investigate the role of non-radiative recombination and
   demonstrate that the photoluminescence is dominated by exciton radiative
   decay processes.}},
DOI = {{10.1038/s42005-020-0309-3}},
Article-Number = {{41}},
ISSN = {{2399-3650}},
ResearcherID-Numbers = {{Carbone, Luigi/O-2193-2015}},
ORCID-Numbers = {{Carbone, Luigi/0000-0002-1369-6890}},
Unique-ID = {{ISI:000519376800001}},
}
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