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SAXS performed on different FASnI3 precursor solutions. SAXS curves of FASnI3 (dotted line) compared to FASnI3 with SnF2 addition (solid line) in a) DMSO and b) DMF, as well as the corresponding fit given in red in the magnified representations. c) Proposed nucleation and growth mechanism in FASnI3 precursor solution affected by SnF2 addition, where the different forms (triangle, quadrangle, pentagon) should schematically describe the potential variety of subunits.
