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Schematic diagram of PSCs device and energy level diagram (a). Schematic synthetic view of Cs3Sb2I9 without (b) and with (c) HCl. SEM images of the Cs3Sb2I9 thin films prepared without antisolvent (d) and with antisolvents of toluene (e), chlorobenzene (f), and isopropanol (g). J–V curves of the PSCs device (h). Reprinted with permission from ref (18). Copyright 2019 John Wiley and Sons.
