Towards Extending Solar Cell Lifetimes: Addition of a Fluorous Cation to Triple Cation‐Based Perovskite Films

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Abstract
Organohalide perovskites have emerged as highly promising replacements for thin‐film solar cells. However, their poor stability under ambient conditions remains problematic, hindering commercial exploitation. The addition of a fluorous‐functionalized imidazolium cation during the preparation of a highly stable cesium‐based mixed perovskite material Cs0.05(MA0.15FA0.85)0.95Pb(I0.85Br0.15)3 (MA=methylammonium; FA=formamidinium) has been shown to influence its stability. The resulting materials, which vary according to the amount of the fluorous‐functionalized imidazolium cation present during fabrication, display a prolonged tolerance to atmospheric humidity (>100 days) along with power conversion efficiencies exceeding 16 %. This work provides a general route that can be implemented in a variety of perovskites and highlights a promising way to increase perovskite solar cell stability.

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