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Full size image Then perovskite solar cells were fabricated with a device configuration of fluorine doped tin oxide (FTO)/compact TiO2/mp-TiO2/perovskite/2,2′,7,7′-Tetrakis(N,N-di-p-methoxyphenyl amine)-9,9′ -spirobifluorene (spiro- MeOTAD)/Au, as shown inSupplementary Fig. 5, and t...