​Phovotovoltaic devices based on organic-inorganic hybrid metal halide perovskites have attracted much attention due to the rapid improvement of their power conversion efficiency from 3.8% to over 25%. Their advantages include ease of fabrication, high light absorption, good charge carrier mobility, tunable bandgap, and low cost. Despite these advantages, their operational stability remains a major obstacle for their commercialization. We use concentrated natural sunlight for accelerated studies of lifetime and light-induced degradation and compare it to outd​oor stability characterization, using an experimental methodology with independent control of sunlight intensity, the sample temperature and environment during the exposure. 


Our studies of perovskite PV materials showed a strong dependence of the stability on the materials composition, correlated with chemical bond strength, crystalline structures and defect density. Studies of device stability revealed a combination of various degradation mechanisms, where different mechanisms dominate at different conditions of applied bias, light intensity and ambient. The elucidated photo-degradation mechanisms allow us to propose methodologies to enhance device stability.



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