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a) Highest PCE reported in tin halide perovskites literature containing solar cell data using SnF2, SnCl2, or none of them, ordered by date until Jan. 2021. b) Comparison of solar cell performance improvement in inorganic and hybrid tin halide perovskites before and after the addition of SnF2, extracted from the studies in literature in which the comparison is made.[ 15 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ]
