Organic bulk heterojunction photovoltaics incorporating cyclopenteno[60]fullerene monoadducts as n-type materials display superior power conversion efficiency than with PC61BM

Abstract

Organic bulk heterojunction photovoltaics, merely incorporating monoadducts of cyclopenteno[60]fullerenes (CPFs) as n-type materials and P3HT as p-type materials, display superior power conversion efficiency up to 4.6 +/- 0.12%, superseding that with PC61BM/P3HT (3.8 +/- 0.20%) for ca. 20%, under AM 1.5G irradiation?primarily attributed to the lack of homo-conjugation on CPFs and their higher LUMO energy levels.