Kanda, HiroyukiUsiobo, Onovbaramwen J.Momblona, CristinaAbuhelaiqa, MousaSutanto, Albertus AdrianIgci, CansuGao, Xiao-XinAudinot, Jean-NicolasWirtz, TomNazeeruddin, Mohammad Khaja2020-12-302020-12-302020-12-302020-12-1510.1002/solr.202000650https://infoscience.epfl.ch/handle/20.500.14299/174352WOS:000598659600001Passivation approaches of perovskite surface are key to improve the light stability of perovskite solar cells. However, a passivation strategy is still required to enhance the durability of the perovskite layer. Here, a promising passivation concept is demonstrated by applying a fluorinated agent on the perovskite layer for light stability improvement. Such fluorinated passivation agents can prevent the formation of Pb-0 at the perovskite surface resulting in suppressing a defect-induced recombination and improving the durability of the perovskite solar cells. As an additional benefit, the fluorinated passivation agent increases the V-OC which improves the photovoltaic performance of the perovskite solar cells. Consequently, with a fluorinated passivation agent, the perovskite maintains a power conversion efficiency of 95% after 300 h of light illumination. It is found that the fluorinated passivation material of 1H,1H,2H,2H-perfluorooctyltriethoxysilane (PFOTES) can improve the stability of the perovskite solar cells.Energy & FuelsMaterials Science, MultidisciplinaryMaterials Sciencefluorinated agentsnanosecondary ion mass spectrometrypassivationperovskitessolar cellshighly efficientelectrontrihalidelengthshysteresistext::journal::journal article::research article