Abstract
Benzo[c] [1,2,5]thiadiazole(BT) core-based novel organic hole-transport materials (HTMs) BTT-PMe and BTT-2F are successfully synthesized for perovskite solar cells. The new HTMs are prepared by the simpler synthetic route with cost-effective purification steps. These HTMs are structurally confirmed by NMR, FT-IR and mass spectroscopy. The optical parameters are analysed using the UV-Vis spectrophotometer and cyclic voltammetry. To further confirmation of these properties we conducted the theoretical studies, which are fully matched with the experimental data. We have studied the effect of fluorine atom for its photo physical properties.