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\bibitem{Ranjbar_etal2017} {\textquotedblleft}\textit{P-N Junction Passivation in Kesterite Solar Cells by Use of Solution-Processed TiO2 Layer}{\textquotedblright}. Ranjbar S, Hadipour A, Vermang B, Batuk M, Hadermann J, Garud S, Sahayaraj S, Meuris M, Brammertz G, da Cunha AF, Poortmans J, IEEE journal of photovoltaics \textbf{7}, 1130 (2017).   http://doi.org/10.1109/JPHOTOV.2017.2692208

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