Influence of the additional electron-withdrawing unit in β-functionalized porphyrin sensitizers on the photovoltaic performance of dye-sensitized solar cells
作者:Futai Lu、Yaqing Feng、Xuexiang Wang、Yanming Zhao、Guang Yang、Jie Zhang、Bao Zhang、Zhixin Zhao
DOI:10.1016/j.dyepig.2016.12.027
日期:2017.4
abilities, between the porphyrin core and the anchoring group and the reference porphyrin dye (LP-4) have been designed and synthesized for DSCs. The influence of the additional electron-withdrawing units on molecular properties as well as photovoltaic performance of the corresponding DSCs was investigated systematically. Compared with LP-4, the introduction of additional electron-deficient unit at the porphyrin
含有附加的吸电子单元,2,3- diphenylquinoxaline(β型官能化卟啉DPQ为)LP-5或-2,1,3-苯并噻二唑(BTD)为LP-6具有不同的吸电子能力,卟啉之间已经设计并合成了用于DSC的核,锚定基团和参考卟啉染料(LP-4)。系统地研究了额外的吸电子单元对分子性能以及相应DSC光伏性能的影响。与LP-4相比,在LP-5和LP-6的卟啉βπ-连接基处引入了额外的电子缺陷单元降低最低的未占用分子轨道(LUMO)能量水平,从而在350-500 nm范围内获得更宽的吸收光谱和IPCE光谱,从而确保了更好的光收集特性和更高的短路电流密度(J sc)。另一方面,引入额外的LP-5和LP-6受体会导致染料聚集,并缩短电荷分离态的寿命,从而降低开路电压(V oc)。有趣的是,V oc的损失被J sc的改善所补偿。。该研究不仅提供了设计新型卟啉敏化剂的替代方法,而且还洞悉了如何通过β-