Daskeviciute-Geguziene, SaruneZhang, YiRakstys, KasparasXiao, ChuanxiaoXia, JianxingQiu, ZhihengDaskeviciene, MarytePaskevicius, TomasJankauskas, VygintasAsiri, Abdullah M.Getautis, VytautasNazeeruddin, Mohammad Khaja2022-10-242022-10-242022-10-24202310.1002/adfm.202208317https://infoscience.epfl.ch/handle/20.500.14299/191620WOS:000865553600001In this study, a series of donor-acceptor-donor (D-A-D) type small molecules based on the fluorene and diphenylethenyl enamine units, which are distinguished by different acceptors, as holetransporting materials (HTMs) for perovskite solar cells is presented. The incorporation of the malononitrile acceptor units is found to be beneficial for not only carrier transportation but also defects passivation via Pb-N interactions. The highest power conversion efficiency of over 22% is achieved on cells based on V1359, which is higher than that of spiro-OMeTAD under identical conditions. This st shows that HTMs prepared via simplified synthetic routes are not only a low-cost alternative to spiro-OMeTAD but also outperform in efficiency and stability state-of-art materials obtained via expensive cross-coupling methods.Chemistry, MultidisciplinaryChemistry, PhysicalNanoscience & NanotechnologyMaterials Science, MultidisciplinaryPhysics, AppliedPhysics, Condensed MatterChemistryScience & Technology - Other TopicsMaterials SciencePhysicsdefects passivationdonor-acceptor-donorfluorenemalononitrileperovskite solar cellslow-costhigh-performancechallengesefficiencyenaminestext::journal::journal article::research article