%0 Journal Article
%T Efficient and Stable Dye-Sensitized Solar Cells Based on a Tetradentate Copper(II/I) Redox Mediator
%J -
%D 2018
%R https://doi.org/10.1021/acsami.8b10182
%X The identification of an efficient and stable redox mediator is of paramount importance for commercialization of dye-sensitized solar cells (DSCs). Herein, we report a new class of copper complexes containing diamine¨Cdipyridine tetradentate ligands (L1 = N,N¡ä-dibenzyl-N,N¡ä-bis(pyridin-2-ylmethyl)ethylenediamine; L2 = N,N¡ä-dibenzyl-N,N¡ä-bis(6-methylpyridin-2-ylmethyl)ethylenediamine) as redox mediators in DSCs. Devices constructed with [Cu(L2)]2+/+ redox couple afford an impressive power conversion efficiency (PCE) of 9.2% measured under simulated one sun irradiation (100 mW cm¨C2, AM 1.5G), which is among the top efficiencies reported thus far for DSCs with copper complex-based redox mediators. Remarkably, the excellent air, photo, and electrochemical stability of the [Cu(L2)]2+/+ complexes renders an outstanding long-term stability of the whole DSC device, maintaining ¡«90% of the initial efficiency over 500 h under continuous full sun irradiation. This work unfolds a new platform for developing highly efficient and stable redox mediators for large-scale application of DSCs
%U https://pubs.acs.org/doi/10.1021/acsami.8b10182