Enhancing Moisture Stability in Perovskite Solar Cells through Dual Interfacial Modification
Oscar Zacharias Telschow a b, Angelika Wrzesińska-Lashkova a b, Shivam Singh a b, Jianan Li c, Bernd Plietker c, Yana Vaynzof a b
a Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden (IFW), Helmholtzstraße 20, 01069, Dresden, Germany.
b Center For Advancing Electronics Dresden (cfaed), TU Dresden, Helmholtzstraße 18, 01089 Dresden, Germany
c Chair of Organic Chemistry I, Faculty of Chemistry and Food Chemistry, TU Dresden, Bergstraße 66, DE-01069 Dresden, Germany
Oral, Oscar Zacharias Telschow, presentation 102
Publication date: 6th February 2024

Following the advances in increasing power conversion efficiencies of hybrid organic-inorganic metal-halide perovskite solar cells (PSCs), recent research efforts have focused more on enhancing their long-term stability. Among the various factors that impact the device’s lifetime, an important role is played by humidity-driven degradation, which, within hours, can significantly lower the starting performance of PSCs.
The influence of humidity has been attributed to hydrogen bonds forming between water molecules in moist air and the nitrogen atoms in widely used ammonium-based organic cations like methylammonium (MA) and formamidinium (FA). To mitigate this process, we introduce sulfonium- and sulfoxonium-based cations like trimethyl sulfonium (TMS) and trimethyl sulfoxonium (TMSO) at the top and buried interface of the perovskite active layer. By examining the interfaces using advanced spectroscopic and microscopic methods and evaluating the performance and stability of the devices, we demonstrate that this approach leads to significantly enhanced moisture stability. Importantly, the strategy can be applied to various perovskite compositions without altering the recipe or structure of the bulk perovskite.

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