Stability in Photoinduced Instability in Mixed-Halide Perovskite Materials and Solar Cells

Bandgap variation due to photoinduced instability in mixed-halide perovskites presents a major obstruction for their future commercial application. Here, the photoinduced process including ever-present halide-ion migration and consequent halide phase segregation is disclosed. We demonstrate that photoinduced halide-ion migration serves as a self-healing behavior, enabling an efficient yield of photoluminescence (PL) without peak shift....