HIGHLIGHTS
SUMMARY
Organometal halide perovskites (OMHPs) of chemical formula ABX3 - with A an organic molecule, B a metal atom and X a halogen atom - possess the same aristotype cubic structure as conventional inorganic perovskites but incorporate at the A-site an organic molecule, possibly polar and which can potentially rotate. The latter motions usually dominate for t and amp;lt; 1 in these compounds and suppress the FE instability, giving rise to a common non-polar Pnma ground_state that arises from the joint condensation of in-phase and out-of-phase rotation motions, according to an . . .
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