Crystallographic evidence indicates that CH3NH3+ distorts iodide positions in CH3NH3PbI3, breaking centrosymmetry and enabling ferroelectricity.
Kutes et al., Direct Observation of Ferroelectric Domains in Solution-Processed CH3NH3PbI3 Perovskite Thin Films
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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.