We unravel the degradation kinetics and found that white light triggers the chemical degradation of perovskite into secondary phases with higher work function and metallic I– V characteristics. Here, by combining multiscale characterization techniques and computational studies, we uncover the role of white light in the surface degradation of state-of-the-art FAPbI 3-rich perovskite absorbers (reaching up to 22% PCE in solar cells). However, a detailed mechanistic understanding of how and why light reduces the long-term stability of perovskites is still lacking. ion migration, phase segregation, and defect intolerance are believed to be the factors behind the degradation. Light-induced degradation in metal halide perovskites is a major concern that can potentially hamper the commercialization of perovskite optoelectronic devices.
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