Abstract Monocyclopropanated fullerene derivatives with decreased electron affinity as compared to standard [60]PCBM acceptor were synthesized, characterized, and investigated as promising electron acceptor materials for fullerene-based organic solar cells. This decrease in electron affinity was attributed to the presence of through-space electronic interactions between the lone electron pairs of oxygen atoms and electron-deficient π-system of the fullerene cage. Organic bulk heterojunction solar cells based on the designed materials blended with conjugated polymers P3HT and PCDTBT have demonstrated spectacular increase in open-circuit voltage by >100 mV and improved light power conversion efficiency as compared to the reference devices comprising [60]PCBM. The application of new fullerene-based acceptor materials in combination with the promising low band gap conjugated copolymer may deliver competitive device performances.

中文翻译：

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具有降低电子亲和力的单环丙烷富勒烯衍生物作为有机太阳能电池的有前途的电子受体材料

摘要 单环丙烷化富勒烯衍生物与标准 [60]PCBM 受体相比电子亲和性降低，被合成、表征和研究，作为富勒烯基有机太阳能电池的有前途的电子受体材料。这种电子亲和力的降低归因于氧原子的孤电子对与富勒烯笼的缺电子 π 系统之间存在空间电子相互作用。基于与共轭聚合物 P3HT 和 PCDTBT 混合的设计材料的有机本体异质结太阳能电池与包含 [60]PCBM 的参考器件相比，开路电压显着增加了 >100 mV，并提高了光功率转换效率。