A comparative study of the effect of fluorine substitution on the photovoltaic performance of benzothiadiazole-based copolymers
作者:Tzong-Liu Wang、Chien-Hsin Yang、Yao-Yuan Chuang
DOI:10.1039/c6ra05062j
日期:——
Two conjugated alternating copolymers to be used as the donor materials of the active layers in polymer solar cells have been designed and synthesized via a Stille coupling reaction. The alternating structure consisted of 4,8-bis((2-ethylhexyl)oxy)benzo[1,2-b:4,5-b′]dithiophene (BDT) as the donor unit and benzo[c][1,2,5]thiadiazole (BT) or fluorinated benzo[c][1,2,5]thiadiazole (FBT) as the acceptor
已经通过Stille偶联反应设计并合成了两种用作聚合物太阳能电池中的活性层的给体材料的共轭交替共聚物。交替结构由4,8-双((2-乙基己基)氧基)苯并[1,2- b:4,5- b ']二噻吩(BDT)作为供体单元和苯并[ c ] [1,2 ,5]噻二唑(BT)或氟化苯并[ c] [1,2,5]噻二唑(FBT)作为受体单元,噻吩基团作为供体和受体单元之间的π桥。由于供体单元已连接烷氧基侧链,因此两种聚合物都可溶于常见的有机溶剂。两种共聚物的紫外可见光谱分别显示在325–900和380–900 nm范围内的宽吸收带,以及相应的1.82和1.80 eV的低带隙。在BT单元氟化后,聚合物的最高占据分子轨道(HOMO)和最低未占据分子轨道(LUMO)能级降低,分别估计为-5.51和-3.71 eV。发现将F原子取代为BT单元促进了分子内电荷转移。与非氟化聚合物相比,J sc和V oc。基于ITO /