Crystallographic evidence indicates that CH3NH3+ distorts iodide positions in CH3NH3PbI3, breaking centrosymmetry and enabling ferroelectricity.
Anusca et al., Dielectric Response: Answer to Many Questions in the Methylammonium Lead Halide Solar Cell Absorbers
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Iodide-methylammonium interaction is responsible for ferroelectricity in CH3NH3PbI3
Crystallographic evidence indicates that CH3NH3+ distorts iodide positions in CH3NH3PbI3, breaking centrosymmetry and enabling ferroelectricity.