Xiao Zhanhai, Chen Bing, Cheng Xudong
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China.
State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Science, Wuhan 430071, China.
Materials (Basel). 2021 Mar 31;14(7):1716. doi: 10.3390/ma14071716.
Three novel organic dyes (, and ), based on indolo[3,2-b]carbazole as the donor and different types of electron-withdrawing groups as the acceptors, were synthesized and successfully applied in dye-sensitized solar cells (DSSCs). Their molecular structures were fully characterized by H NMR, C NMR and mass spectroscopy. The density functional theory (DFT) calculations, electrochemical impedance spectroscopy analysis, UV-Vis absorption characterization and tests of the solar cells were used to investigate the photophysical/electrochemical properties as well as DSSCs' performances based on the dyes. Dye showed the broadest light-response range (300-770 nm) in the incident monochromatic photo-to-electron conversion efficiency (IPCE) curve, due to its narrow bandgap (1.95 eV). However, dye exhibited the best device performance among the three dyes, with power conversion efficiency of 5.41%, J of 12.55 mA cm, V of 745 mV and fill factor (FF) of 0.59. We also found that dye aggregation was efficiently suppressed by the introduction of alkylated indolo[3,2-b]carbazole, and, hence, better power conversion efficiencies were observed for all the three dyes, compared to the devices of co-sensitization with chenodeoxycholic acid (CDCA). It was unnecessary to add adsorbents to suppress the dye aggregation.
合成了三种新型有机染料（、和），它们以吲哚并[3,2 - b]咔唑作为供体，不同类型的吸电子基团作为受体，并成功应用于染料敏化太阳能电池（DSSC）。通过氢核磁共振（H NMR）、碳核磁共振（C NMR）和质谱对其分子结构进行了全面表征。利用密度泛函理论（DFT）计算、电化学阻抗谱分析、紫外 - 可见吸收表征以及太阳能电池测试，研究了基于这些染料的光物理/电化学性质以及DSSC的性能。染料由于其窄带隙（1.95 eV），在入射单色光到电子转换效率（IPCE）曲线中显示出最宽的光响应范围（300 - 770 nm）。然而，染料在这三种染料中表现出最佳的器件性能，功率转换效率为5.41%，电流密度（J）为12.55 mA/cm²，开路电压（V）为745 mV，填充因子（FF）为0.59。我们还发现，通过引入烷基化吲哚并[3,2 - b]咔唑可有效抑制染料聚集，因此，与用鹅去氧胆酸（CDCA）共敏化的器件相比，这三种染料的功率转换效率都更高。无需添加吸附剂来抑制染料聚集。
