Facile syntheses of N-alkylaziridino[60]fullerenes and their application in polymer solar cells

► N-alkylaziridino[60]fullerenes (NAAFs) were synthesized via a simple route under mild ambient conditions. ► NAAFs show good electron affinity, thermal stability and solubility. ► Polymer solar cells based on NAAF/P3HT afforded power conversion efficiencies up to 2.92%. ► Polymer solar cells based on NAAF/P3HT keep good performance with low fullerene content.