New cyclopropano[70]fullerene derivatives for the photovoltaic application

New cyclopropano[70]fullerenes derivatives were synthesised for photovoltaic (PV) application. The organic PV cells realized with these molecules blended with RR-P3HT polymer provided improved characteristics: 1.5% conversion efficiency (η%), 9.29 mA/cm 2 current density, 0.51 V open circuit voltage and 0.34 fill factor. The IPCE spectrum for P3HT: cyclopropano[70]fullerene cells shows a new peak around 430 nm with 71% external quantum efficiency. This explains the increased current density.