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a Schematic representation of the influence of the ionic radius of the A-site cation on the structure and dimensionality of A3Sb2I9-type perovskite compounds, and b J–V curves of Rb3Sb2I9-based solar cells under illuminated and dark conditions in forward and reverse scan direction (inset energy level diagram). Reprinted with permission from [35]. Copyright (2016) American Chemical Society
