Open circuit voltage of organic photovoltaic cells using C60 as acceptor: variation with the donorZouhair El Jouad, Linda Cattin, Mohammed Addou and Jean Christian BernèdeEur. Phys. J. Appl. Phys., 86 2 (2019) 20201DOI: https://doi.org/10.1051/epjap/2019190047