A Stable Copper-Modified Bipyridine Mediator for Highly Efficient Dye-Sensitized Solar Cells

Yu-Hsuan Chen,Ching-Chin Chen,Vinh Son Nguyen, Xiao-Tong Jiang,Yan-Da Chen, Ming-You Li, Sheng-Yang Chen,Tzu-Chien Wei,Chen-Yu Yeh

CELL REPORTS PHYSICAL SCIENCE（2024）

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Abstract

Dye-sensitized solar cells (DSSCs) have garnered significant research attention for their cost-effectiveness, transparency, flexibility, etc. In this work, a copper complex of a bipyridine-modified mediator, [Cu(dmodmbp)(2)](+/2+), is developed to minimize the loss in fill factor (FF). A DA2 dye, inspired by the structures of previously reported LC4 and LC5 dyes, incorporates cascade acceptors to enhance light absorption and increase the short-circuit current (Jsc). These innovations lead to highly efficient DSSCs with an impressive power conversion efficiency (PCE) of 10.2% (J(sc) = 12.10 mA cm(-2), open-circuit voltage [V-Oc] = 1.11 V, FF = 0.764) as well as a remarkable photostability. A test over 95 days shows that 88% of the initial PCE can be maintained, with V-Oc, J(sc), and FF retaining 98%, 97%, and 93% of their initial values, respectively.

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Key words

copper,cascade acceptor,dye-sensitized solar cells,light-harvesting,photostability,redox couple,4-tert-butylpyridine poisoning

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