Two stereomers of bisadduct analogues of [6, 6]-phenyl-C71-butyric acid methyl ester (bisPC71BM) were synthesized and their geometrical structures with cis- or trans-configuration were identified by X-ray crystallog...Two stereomers of bisadduct analogues of [6, 6]-phenyl-C71-butyric acid methyl ester (bisPC71BM) were synthesized and their geometrical structures with cis- or trans-configuration were identified by X-ray crystallogra- phy. Although both of the bisPC71BM have similar spec- trometric and electrochemical properties, the spatial orientation of the two addition groups on C7o has impact on crystal packing and molecular assembly of bisPC71BM isomers and, in turn, photovoltaic performance in polymer solar cell based on poly(3-hexylthiophene) (P3HT) (with power conversion efficiency of 1.72 % and 1.84 % for the solar cells involving cis- and trans-bisPC71BM, respec- tively). Although the power conversion efficiency remains to be improved, this work exemplifies that the photovoltaic properties of fullerene-based electron acceptors areinfluenced by aggregation of the stereomeric molecules and thus extends the guidelines for rational design of efficient fullerene acceptor.展开更多
基金supported by the National Basic Research Program of China(2014CB845601)the National Natural Science Foundation of China(U1205111+3 种基金2139039051572231and51502252)the Fundamental Research Funds for the Central Universities(20720140512)
文摘Two stereomers of bisadduct analogues of [6, 6]-phenyl-C71-butyric acid methyl ester (bisPC71BM) were synthesized and their geometrical structures with cis- or trans-configuration were identified by X-ray crystallogra- phy. Although both of the bisPC71BM have similar spec- trometric and electrochemical properties, the spatial orientation of the two addition groups on C7o has impact on crystal packing and molecular assembly of bisPC71BM isomers and, in turn, photovoltaic performance in polymer solar cell based on poly(3-hexylthiophene) (P3HT) (with power conversion efficiency of 1.72 % and 1.84 % for the solar cells involving cis- and trans-bisPC71BM, respec- tively). Although the power conversion efficiency remains to be improved, this work exemplifies that the photovoltaic properties of fullerene-based electron acceptors areinfluenced by aggregation of the stereomeric molecules and thus extends the guidelines for rational design of efficient fullerene acceptor.