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Hybrid lead-halide perovskites have emerged as an excellent class ofphotovoltaic materials. Recent reports suggest that the organic molecularcation is responsible for local polar fluctuations that inhibit carrierrecombination. We combine low frequency Raman scattering with first-principlesmolecular dynamics (MD) to study the fundamental nature of these local polarfluctuations. Our observations of a strong central peak in both hybrid(CH$_3$NH$_3$PbBr$_3$) and all-inorganic (CsPbBr$_3$) lead-halide perovskitesshow that anharmonic, local polar fluctuations are intrinsic to the generallead-halide perovskite structure, and not unique to the dipolar organic cation.MD simulations show that head-to-head Cs motion coupled to Br face expansion,on a few hundred femtosecond time scale, drives the local polar fluctuations inCsPbBr$_3$.

Local polar fluctuations in lead halide perovskite crystals