Dihydronaphthyl-based [60] fullerene bisadducts for efficient and stable polymer solar cells

Dihydronaphthyl-based [60] fullerene bisadduct derivative, NC(60)BA, was synthesized at mild temperature in high yield. NC(60)BA not only possesses a LUMO energy level 0.16 eV higher than PC61BM but also has amorphous nature that can overcome thermal-driven crystallization. The fabricated P3HT: NC(60)BA-based polymer solar cells exhibit superior photovoltaic performance and thermal stability compared to PC61BM-based devices under the same conditions.