Disorder-induced stabilization of optoelectronic CsPbI3-based perovskite using synchrotron radiation

Halide perovskites have complex short-/long-range order, which is connected to their phase properties. This calls for novel ways to engineer strain and regulate phase, and suitable methods to characterization the phase transition dynamics. CsPbI3 perovskite is promising for optical applications; however, it is unstable under ambient conditions, forming a yellow non-perovskite phase, hindering adoption. This project aims to use Br-doped CsPbI3 crystals as a materials platform to examine radiation-induced disorder and phase stabilization: Stage I will induce local structural disorder via resonant X-ray absorption at Br sites, and Stage II will examine the microstructure and thermal-phase properties. This is motivated by preliminary data of synchrotron radiation-induced stabilization of CsPbI3 perovskite, opening a new paradigm for stabilization. However, this is only empirically understood, and experiments at SNBL-BM01 will help develop models to rationalize/exploit these observations.