中文摘要：

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。

英文摘要：

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 P3 HT 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-PC70 BM as the acceptors and poly[[4,8-bis[（2-ethylhexyl）oxy]benzo[l,2-b：4,5-b＇]dithiophene-2,6-diyl][3-fluoro-2-[（2-ethylhexyl）carbonyl]thieno[3,4-bJthiophenediyl]]（PTB7）as the donor.The cell configuration is ITO/PEDOT：PSS/active layer /LiF/Al.The PSCs with PC70 BM,ICBA and bis-PC70 BM 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.