Finite Size Effects on Light-Induced Correlated Ionic and Electronic Transport in Mixed Halide Perovskites

Mixed halide perovskites often undergo reversible phase segregation under illumination, yet the exact underlying mechanism and the material properties affecting this process remain unclear. By combining time-resolved photoluminescence (TRPL) with in situ X-ray diffraction (XRD) under illumination, we show that segregation kinetics and the thermodynamic limit of segregation under illumination in MAPbI1.5Br1.5 are not intrinsically […]