A diketopyrrolopyrrole-based low bandgap polymer with enhanced photovoltaic performances through backbone twisting
作者:Shuguang Wen、Weichao Chen、Meijie Fan、Linrui Duan、Meng Qiu、Mingliang Sun、Liangliang Han、Renqiang Yang
DOI:10.1039/c6ta08130d
日期:——
electron donor material for polymer solar cells. We have incorporated alkyl groups into the 4-position of the thiophene rings connected to the DPP fragment, which is proven to be beneficial for improving the open-circuit voltage (VOC) and short-circuit current density (JSC). Two DPP-based polymers are synthesized with benzo[1,2-b:4,5-b′]dithiophene (BDT) as the electron-donating segment. Both the polymers
基于二酮吡咯并吡咯(DPP)的π共轭聚合物是用于聚合物太阳能电池的非常有前途的低带隙电子供体材料。我们已将烷基结合到与DPP片段相连的噻吩环的4位上,这被证明有助于改善开路电压(V OC)和短路电流密度(J SC)。以苯并[1,2- b:4,5- b ']二噻吩(BDT)为供电子链段,合成了两种基于DPP的聚合物。当结合烷基时,两种聚合物均显示出良好的溶解性,稍宽的光学带隙和较深的HOMO能级。异质结太阳能电池由聚合物:PC 71制成BM作为有源层。与传统的DPP-BDT交替聚合物的器件性能相比,同时提高了V OC和J SC。获得的功率转换效率(PCE)为8.11%,这表明合理利用主干扭转是改善光伏性能的有前途的策略。