Thiophene fluorination to enhance photovoltaic performance in low band gap donor–acceptor polymers
作者:Zhuping Fei、Munazza Shahid、Nir Yaacobi-Gross、Stephan Rossbauer、Hongliang Zhong、Scott E. Watkins、Thomas D. Anthopoulos、Martin Heeney
DOI:10.1039/c2cc35079c
日期:——
We report the first synthesis of a tetrafluorinated 4,7-bis(3,4-difluorothiophen-2-yl)-2,1,3-benzothiadiazole monomer and its polymerisation with dithieno[3,2-b:2â²,3â²-d]germole by Stille coupling to afford a low band gap polymer with a high ionisation potential. Direct comparison to the non-fluorinated analogue demonstrates that fluorination results in an increase in ionisation potential with no change in optical band gap, and enhanced aggregation over the non-fluorinated polymer. These desirable properties result in a significant enhancement in OPV device performance in blends with PC71BM.
我们报告了第一种四氟化的4,7-双(3,4-二氟噻吩-2-基)-2,1,3-苯并噻二唑单体的合成,以及通过Stille耦合与二噻吩[3,2-b:2′,3′-d]锗烯的聚合,制得一种低带隙、高离子化势的聚合物。与非氟化类似物的直接比较表明,氟化导致离子化势的增加而光学带隙没有变化,并且相较于非氟化聚合物,聚集性增强。这些理想特性在与PC71BM的混合物中显著提高了有机光伏设备的性能。