Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.221
Publication date: 23rd September 2021
Employing 2D/3D heterostructures has become a prominent passivation strategy to enhance the open-circuit voltage (VOC) and fill factor (FF) of perovskite solar cells (PSC). The most widely employed 2D/3D interfaces are based on Ruddlesden Popper (RP) perovskites via treating the perovskite film surface with long chain alkylammonium salts. However, the detailed microscopic and electronic structure at the surface of such passivated films and the mechanisms governing the observed enhancements in device performance are still poorly understood. Here, we analyze methylammonium-free Cs0.18FA0.82PbI3 perovskite films that are passivated employing a recently developed passivation strategy using phenethylammonium chloride, that was shown to form 2D RP (PEA)2(Cs1−xFAx)n−1Pbn(I1−yCly)3n+1 phase with n ~1-2 at the GBs and film surface. [1] We perform cathodoluminescence (CL) in conjunction with Kelvin probe force microscopy (KPFM) on unpassivated reference films, grain boundary passivated films and grain boundary & surface passivated films with the aim to correlate the observations from these complementary techniques. We discuss the challenges and limitations of the measurements. Our results thereby improve the understanding of perovskite films passivated employing 2D RP perovskite phases.
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