The central Raman peak observed in cubic and tetragonal phases of metal halide perovskites is attributed primarily to disorder-induced second-order acoustic-phonon Raman scattering, drawing support from analogous behavior in other disordered semiconductor systems.
Equal footing of thermal ex- pansion and electron-phonon interaction in the temperature dependence of lead halide perovskite band gaps
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Phonon Interactions in Metal Halide Perovskites elucidated by Raman Scattering
The central Raman peak observed in cubic and tetragonal phases of metal halide perovskites is attributed primarily to disorder-induced second-order acoustic-phonon Raman scattering, drawing support from analogous behavior in other disordered semiconductor systems.