Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 36, Pages 30409-30416Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b10182
Keywords
copper redox mediator; dye-sensitized solar cells; ligand engineering; stability; energy conversion
Funding
- National Natural Science Foundation of China [21606039, 21673028, 51661135021, 91233201]
- Fundamental Research Funds for the Central Universities [DUT17JC39]
- Swedish Foundation for Strategic Research (SSF)
- Swedish Energy Agency
- Knut and Alice Wallenberg Foundation
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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-dipyridine tetradentate ligands (L1 = N,N'-dibenzyl-N,N'-bis-(pyridin-2-ylmethyl)ethylenediamine; L2 = N,N'-dibenzyl-N,N'-bis (6-methyl-pyridin-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(-2), 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 similar to 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.
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