Structural Origins of Light-Induced Phase Segregation in Organic-Inorganic Halide Perovskite Photovoltaic Materials

摘要： Light-induced phase segregation in mixed-halide perovskite photovoltaic materials results in the formation of low-band-gap regions that limit the voltage of devices. This work explores the dependence of this light instability on crystal structure and maps it across the cubic-tetragonal solvus in the (CsyFA1?y)Pb(BrxI1?x)3 phase diagram.