Excitonic emission and phonon anharmonicity in Cs3Sb2Br9
Debabrata Samanta,
Gouranga Manna,
Sonu Pratap Chaudhary
et al.
Abstract:We investigate emission characteristics, phonon–phonon, and electron–phonon interactions in a lead-free halide perovskite Cs3Sb2Br9 through temperature-dependent photoluminescence, Raman scattering, and x-ray diffraction measurements. The exciton–optical phonon coupling leads to below bandgap broad emissions, arising from self-trapped excitons recombination. The anomalous temperature dependence of the lowest frequency Raman mode is attributed to the phonon–phonon and electron–phonon interactions. The temperatu… Show more
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