使用两种或者更多种类的富勒烯衍生物作为受体可以使poly(3-己基噻吩)（P3TH）系的混合异质结太阳能电池效率明显提升。 这样的提升源于当受体使用富勒烯多重加合物的最低未占轨道（LUMO）提升而使其开路电压升高。 虽然其他聚合物也同样能获得高的开路电压, 但是大多数的聚合物却不像P3TH一样获得性能提升, 在与像苯基-C61-丁酸甲酯 (bis-PCBM)或者the indene-C60 bis-adduct (ICBA)混合后表现出下降的光电流。 在此, 我们研究这些性能改变的原因。 使用［6,6］-苯基C70-丁酸甲酯(PC70BM), ICBA和bis-PC70BM作为受体并且PTB7作为给体, 其结构为: ITO/PEDOT: PSS/活性层/LiF/Al, 聚合物太阳能电池的表现的性能分别为7.29%, 4.92% 和3.33%。 性能的改变可能主要归因于不同受体影响器件激子产生和电荷收集。

The application of fullerenes with two or more adducts as acceptors has greatly enhanced the performance of bulk-heterojunction solar cells with poly (3-hexylthiophene) (P3HT) as the donor. The enhancement is caused by a substantial increase in the open-circuit voltage due to a rise in the fullerene lowest unoccupied molecular orbital (LUMO) level when going from monoadducts to multiadducts. While the increase in the open-circuit voltage is obtained with many different polymers, most polymers other than P3HT show a substantially reduced photocurrent when blended with fullerene multi-adducts such as bis adduct of Phenyl-C61 -butyric acid methyl ester (bis-PCBM) or the indene-C60 bis-adduct (ICBA). Here we investigate the reasons for this change in performance of polymer solar cells(PSCs) based on ［6,6］-phenyl C70-butyric acid methyl ester (PC70BM), ICBA and bis-PC70BM as the acceptors and poly［［4,8-bis［(2-ethylhexyl)oxy]benzo［1,2-b:4,5-b’］dithiophene-2,6-diyl］［3-fluoro-2-［(2-ethylhexyl)carbonyl］thieno［3,4-b]thiophenediyl］］（PTB7）as the donor. The cell configuration is ITO/PEDOT: PSS/active layer /LiF/Al .The PSCs with PC70BM, ICBA and bis-PC70BM show PCEs of 7.29%, 4.92% and 3.33%, respectively. The change of performance of the PSCs could be mainly attributed to the different excition generation and charge collection of PSCs employing different fullerene multi-adducts as acceptors.