Interplay of structural and compositional effects on carrier recombination in mixed-halide perovskites

Eric M. Talbert, Holly F. Zarick, Noah J. Orfield, Wei Li, William R. Erwin, Zachary R. Debra, Kemar R. Reid, Christopher P. McDonald, James R. McBride, Jason Valentine, Sandra J. Rosenthal, Rizia Bardhan

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18 Citations (Scopus)


In this work, we investigate the effects of grain structure and bromide content on charge transport in methylammonium lead iodide/bromide (MAPb(I1-xBrx)3) perovskites by examining the steady-state (ss-PL) and time-resolved (tr-PL) photoluminescence of planar films with varying grain size and bromide content. We controlled the perovskite grain structure via solvent engineering with N,N-dimethylformamide (DMF) or dimethyl sulfoxide:γ-butyrolactone (DMSO:GBL), and the resultant grain morphology was independent of Br doping between 0-33%. Carrier lifetimes ranged from 29-52 ns with increasing Br content for DMF-produced perovskite films, and from 2-9 ns for films obtained with DMSO:GBL. Analysis of XRD and photoluminescence data suggests this order-of-magnitude difference in lifetimes is attributable to the nature of iodide-rich recombination nuclei within the bulk perovskite. By modulating the precursor solvent and Br composition, the influence of low-bandgap recombination nuclei can be minimized to enhance charge transport and lengthen the carrier lifetime in mixed-halide perovskite films.

Original languageEnglish
Pages (from-to)86947-86954
Number of pages8
JournalRSC Advances
Issue number90
Publication statusPublished - 2016
Externally publishedYes

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