3 years ago

Spectral Heterogeneity of Hybrid Lead Halide Perovskites Demystified by Spatially Resolved Emission

Spectral Heterogeneity of Hybrid Lead Halide Perovskites Demystified by Spatially Resolved Emission
Prashant K. Jain, Varun Mohan
Solution-processed films of methylammonium lead bromide (MAPbBr3) perovskites have remarkable photoluminescence (PL), with utility in light-emitting devices (LEDs) and photodiodes; however, the PL emission is often complex, heterogeneous, anomalous, or poorly understood. We provide a deeper understanding by studying PL spectra of single MAPbBr3 crystallites with intracrystallite spatial resolution. We uncover an emission emanating from the crystallite boundaries that is spectrally distinct from the band-to-band recombination-based emission from the crystallite interiors. Both forms of emission contribute to spatially averaged PL measured on heterogeneous samples. We also map the PL emission spectrum in a distant-dependent manner across a single crystallite. The systematic distance dependence observed reveals that a portion of the PL emission emanating from within a crystallite is waveguided and outcoupled from the boundaries of the crystallite in a form that is spectrally modulated by self-absorption. Spatial heterogeneities, self-absorption, and filtered-emission of PL are all processes that must be considered in the future design of perovskite-based LEDs.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b08005

DOI: 10.1021/acs.jpcc.7b08005

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