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.
Parallel alignment of methylammonium cations in an orthorhombic CH3NH3PbCl3 single crystal observed by polarized micro-Raman scattering spectroscopy
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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.