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Thienothiophene‐Based Cation Treatment
In article number 2103130, Selcuk Yerci, Gorkem Gunbas, and co‐workers fabricate perovskite solar cells (PSC) by treating 3D perovskite surfaces with a novel cation, which enables higher power conversion efficiency (PCE) and improved stability. The PCE enhancement is explained by drift diffusion modeling. Additionally, treated 3D perovskite based semitransparent...
Perovskite surface treatment with additives has been reported to improve charge extraction, stability, and/or surface passivation. In this study, treatment of a 3D perovskite ((FAPbI3)1−x(MAPbBr3)x) layer with a thienothiophene‐based organic cation (TTMAI), synthesized in this work, is investigated. Detailed analyses reveal that a 2D (n = 1) or quasi‐2D layer does not form on the PbI2‐rich surface...
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