Copper Redox Mediators with alkoxy groups suppressing recombination for Dye-Sensitized Solar Cells
作者单位：Institute of Artificial PhotosynthesisState Key Laboratory of Fine ChemicalsDUT-KTH Joint Education and Research Centre on Molecular DevicesDalian University of Technology (DUT)
会议名称：《第八届新型太阳能材料科学与技术学术研讨会》
会议日期：2021年
学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学]
关 键 词：copper redox couple dye sensitized solar cells energy conversion photovoltaic device electron recombination
摘 要：Two copper complexes([Cu(moby)](moby=6,6’-bis(methoxymethyl)-2,2’-bipyridine) and [Cu(eoby)],(eoby=6,6’-bis(ethoxymethyl)-2,2’-bipyridine)) with bipyridine ligands were synthesized and used as redox mediators in dye-sensitized solar cells(DSSCs). The DSSCs exhibited high power conversion efficiencies of over 10% under simulated one sun irradiation(100 mW cm, AM 1.5 G). The introduction of alkoxy groups onto the ligands effectively suppress charge recombination and increased the solubility of the copper complexes in acetonitrile, which led to the high photocurrent and stability of the DSSCs. The redox potentials of [Cu(moby)]and [Cu(eoby)] were 0.65 V and 0.70 V, respectively, whereas the open-circuit voltages of their DSSCs were still above 1.0 V. The relatively low redox potentials of the copper complexes enable them to match with more sensitizers to realize DSSCs with high photocurrent and photovoltage, providing an opportunity to further improve DSSCs by optimizing the copper redox mediator.