Octahedral tilting and B-site off-centering in halide perovskites are symmetry-decoupled; the Pb-to-Ge trend in tilting comes from partial covalent Br-B bonding that stiffens tilt modes, not from the lone pair directly.
Size-dependent lattice symmetry break- ing determines the exciton fine structure of perovskite nanocrystals,
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Octahedral tilting and B-site off-centering in halide perovskites are not coupled
Octahedral tilting and B-site off-centering in halide perovskites are symmetry-decoupled; the Pb-to-Ge trend in tilting comes from partial covalent Br-B bonding that stiffens tilt modes, not from the lone pair directly.