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This, combined with the fact that the sampled companies were involved in manufacturing 13 different product groups, greatly increases the generalizability of the results. © 2020 The Authors.The vibrational density of states (VDOS), electronic structure and optical properties of bulk organo lead-halide perovskites, CH3NH3PbX3 (where X = Cl, I and Br), very promising and exciting candidate materials for solar-energy applications, have been studied by means of (hybrid) Density Functional Theory (DFT), with and without spin-orbit coupling, and equilibrium Born-