Three antimony-based organic–inorganic hybrid perovskites (1,4-3.2.2-H2dabcn)SbX5 (X = Cl, Br, I) show progressively decreasing phase transition temperatures and bandgaps

Three novel one-dimensional antimony-based organic–inorganic hybrid perovskites were obtained via a halogen-substitution strategy, in which the increasing halogen size reduces phase transition temperatures and bandgaps.