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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 CH 3 NH 3 PbBr 3 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 …
Nature Publishing Group
Publication date: 
27 Feb 2020

Fabrizio Mariano, Arianna Cretì, Luigi Carbone, Armando Genco, Stefania D’Agostino, Sonia Carallo, Giovanni Montagna, Mauro Lomascolo, Marco Mazzeo

Biblio References: 
Volume: 3 Issue: 1 Pages: 1-10
Communications Physics