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Wiley, Angewandte Chemie, 29(133), p. 16292-16299, 2021

DOI: 10.1002/ange.202104563

Wiley, Angewandte Chemie International Edition, 29(60), p. 16156-16163, 2021

DOI: 10.1002/anie.202104563

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Stable Dye‐Sensitized Solar Cells Based on Copper(II/I) Redox Mediators Bearing a Pentadentate Ligand

Journal article published in 2021 by Hailong Rui, Junyu Shen ORCID, Ze Yu ORCID, Lihua Li, Hongxian Han, Licheng Sun
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

AbstractIn 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 CuII 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)]2+/+ (tpe=N‐benzyl‐N,N′,N′‐tris(pyridin‐2‐ylmethyl)ethylenediamine) and [Cu(tme)]2+/+ (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)]2+/+ 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.