Aziridinium cation as a versatile template for hybrid organic–inorganic perovskites of all dimensionalities

Here we report on a series of new aziridinium-based perovskites with bismuth and antimony (AzrH) 3 M 2 X 9 (AzrH = aziridinium, M = Bi and Sb, X = Cl, Br, and I) which have versatile crystal structures and feature strong excitonic absorption.