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\bibitem{Zillner_etal2022} {\textquotedblleft}\textit{The role of SnF$_{2}$ additive on interface formation in all lead-free FASnI$_{3}$ perovskite solar cells}{\textquotedblright}. Zillner J, Boyen H-G, Schulz P, Hanisch J, Gauquelin N, Verbeeck J, Kueffner J, Desta D, Eisele L, Ahlswede E, Powalla M, Advanced functional materials , 2109649 (2022).   http://doi.org/10.1002/ADFM.202109649

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