Aziridinium Lead Iodide: A Stable, Low-Band-Gap Hybrid Halide Perovskite for Photovoltaics

The low ionization energy of an A site molecule is a very important factor, which determines the thermodynamical stability of APbI₃ hybrid halide perovskites, while the size of the molecule governs the stable phase at room temperature and, eventually, the band gap. It is challenging to achieve both a low ionization energy and the reasonable size for the PbI₃ cage to circumvent the stability issue inherent to hybrid halide perovskites. Here we …