Ye, FangyuanFangyuanYeZhang, ShuoShuoZhangLang, FelixFelixLangRaoufi, MeysamMeysamRaoufiLiang, JianjunJianjunLiangLevine, IgalIgalLevineHempel, HannesHannesHempelMenzel, DorotheeDorotheeMenzelZu, FengshuoFengshuoZuAlbrecht, SteveSteveAlbrechtKorte, LarsLarsKorteMeßmer, Christoph AlexanderChristoph AlexanderMeßmerSchön, JonasJonasSchönGlunz, StefanStefanGlunzUnold, ThomasThomasUnoldKoch, NorbertNorbertKochNeher, DieterDieterNeherYe, DongtingDongtingYeWu, YongzhenYongzhenWuStolterfoht, MartinMartinStolterfoht2025-07-222025-07-222025Note-ID: 0000D2EAhttps://publica.fraunhofer.de/handle/publica/48979010.1021/acsenergylett.5c00615Advancing inverted perovskite solar cells requires effective strategies to mitigate nonradiative recombination at the perovskite/C60 interface. Here, we report a volatile material that forms a thin, dense interlayer that essentially eliminates the C60-induced nonradiative interfacial recombination loss despite not directly passivating the perovskite surface. Ultraviolet photoelectron spectroscopy highlights that the molecule forms a positive dipole layer on the surface that aligns the perovskite and C60 energy levels for electron conduction. Furthermore, the molecule’s volatile nature allows the use of a high-concentration solution that enables a high surface coverage (likely >99%) without increasing the thickness. The combination of these two effects yields an effective approach to suppressing interface recombination. The resulting triple cation perovskite solar cells achieved a power conversion efficiency of >25% and the devices maintain >90% of their initial efficiency after 1200 h of operation. Furthermore, the molecule is broadly applicable to various perovskite compositions and bandgaps.enInterfacesLayersPerovskitesPower Conversion EfficiencyRecombinationjournal article