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\bibitem{Vandenberghe_etal2012} {\textquotedblleft}\textit{A model determining optimal doping concentration and material{\textquoteright}s band gap of tunnel field-effect transistors}{\textquotedblright}. Vandenberghe WG, Verhulst AS, Kao K-H, De Meyer K, Sor{\'e}e B, Magnus W, Groeseneken G, Applied physics letters \textbf{100}, 193509 (2012).   http://doi.org/10.1063/1.4714544

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