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Diphenylamine-based hole-transporting materials for excessive-overall performance perovskite solar cells: Insights
Farzad Arjomandi Rad1, Mehdi D Esrafili2
1Department of Chemistry, Bonab Branch, Islamic Azad University, Bonab, Iran; Department of Chemistry, Faculty of Basic Sciences, University of Maragheh, Maragheh, Iran.
Abstract:
Density functional theory calculations were employed to identify the ability of some diphenylamine-based hole-transporting materials (HTMs) for use in top-performance perovskite solar cells. The effects of donor/acceptor electron groups and the new π-bridge section in the three-part of structures were investigated thoroughly. The results indicated that adding electron-withdrawing functional groups such as CN in the phenylazo-indol moiety and substituting electron donor groups such as CH3 in the NH2 hydrogen atoms of the diphenylamine section can cause higher power conversion light-harvesting efficiency in new HTMs. Also, the replacement of thieno [3,2-b] benzothiophene as a part of the π bridge with the phenyl group according to the optical and electronic structure properties improves the efficiency of the new phenylazoindole derivatives.
