Rui Hailong, Shen Junyu, Yu Ze, Li Lihua, Han Hongxian, Sun Licheng
State Key Laboratory of Fine Chemicals, Dalian University of Technology (DUT), Dalian, 116024, China.
Jiangsu Laboratory of Advanced Functional Materials, School of Materials Engineering, Changshu Institute of Technology, Changshu, 215500, China.
Angew Chem Int Ed Engl. 2021 Jul 12;60(29):16156-16163. doi: 10.1002/anie.202104563. Epub 2021 Jun 9.
In recent years, copper redox mediators have attracted growing interest in dye-sensitized solar cells (DSCs). However, experiments revealed that ubiquitously used Lewis-base additives in the electrolytes coordinate to the Cu species, which restricts further enhancement of device performance and stability. We report the application of copper complexes endowed with diamine-tripyridine pentadentate ligands, [Cu(tpe)] (tpe=N-benzyl-N,N',N'-tris(pyridin-2-ylmethyl)ethylenediamine) and [Cu(tme)] (tme=N-benzyl-N,N',N'-tris(6-methylpyridin-2-ylmethyl)ethylenediamine), as redox mediators in DSCs. Experimental measurements demonstrate that the coordination environment of Cu(II) complexes with pentadentate ligands remains unchanged in the presence of TBP, which is in stark contrast to the state-of-the-art bipyridyl counterpart. DSCs based on [Cu(tme)] complexes exhibit an excellent long-term stability and maintain more than 90 % of the initial efficiency after 400 h under continuous illumination, which outperform the reference devices incorporating the bipyridyl counterpart (less than 80 %) under identical conditions.
近年来，铜氧化还原介质在染料敏化太阳能电池（DSC）中引起了越来越多的关注。然而，实验表明，电解质中普遍使用的路易斯碱添加剂会与铜物种配位，这限制了器件性能和稳定性的进一步提高。我们报道了赋予二胺-三吡啶五齿配体的铜配合物[Cu(tpe)]（tpe=N-苄基-N,N',N'-三(吡啶-2-基甲基)乙二胺）和[Cu(tme)]（tme=N-苄基-N,N',N'-三(6-甲基吡啶-2-基甲基)乙二胺）作为DSC中的氧化还原介质的应用。实验测量表明，在TBP存在下，具有五齿配体的Cu(II)配合物的配位环境保持不变，这与最先进的联吡啶对应物的状态形成鲜明对比。基于[Cu(tme)]配合物的DSC表现出优异的长期稳定性，并在连续光照400小时后保持初始效率的90%以上，在相同条件下优于包含联吡啶对应物的参考器件（低于80%）。
