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IPCE curves of nanoscale MAPbIxBr3−x‐sensitized cells from (a) PbI2 and (b) PbBr2 deposition as the first step followed by addition of a mixture of MAI and MABr in decreasing molar ratios from 5:0, 4:1, 3:2, 2:3, 1:4, and 0:5 [1–6 in (a) and 7–12 in (b)].
