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A cobalt-catalyzed cyclotrimerization of bis(aryl)alkyne is used as an innovative tool to obtain hole-transport materials (HTMs). The novel HTM containing six units of oligotriarylamine (HAB1), characterized by UV-vis, cyclic voltammetry, DFT, and thermogravimetric analysis, confirms its suitability as an efficient HTM in PSCs. A PCE of 17.5% was obtained in HAB1-containing PSCs, a performance comparable to that obtained with spiro-OMeTAD and with slightly better thermal stability.
Mohammad Khaja Nazeeruddin, Iwan Zimmermann, Inés Garcia Benito, Javier Urieta Mora
Michael Graetzel, Shaik Mohammed Zakeeruddin, Jovana Milic, Jiyoun Seo, Hui-Seon Kim, Seckin Akin, Marco Alejandro Ruiz Preciado