Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 20, Pages 12808-12814Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta02735a
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Funding
- National Natural Science Foundation of China [21606039, 21673028, 51661135021, 51872126, 51672111, 91233201]
- Swiss National Science Foundation [IZLCZ2_170177]
- Fundamental Research Funds for the Central Universities [DUT17JC39, DUT17ZD204]
- Swedish Foundation for Strategic Research (SSF)
- Swedish Energy Agency
- Knut and Alice Wallenberg Foundation
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Natural systems have marvelously utilized copper complexes featuring sulfur-coordinating ligands, known as blue copper proteins, as efficient electron-transfer mediators in biological processes. Copper complexes with sulfur-coordinating ligands have been attempted as redox mediators in dye-sensitized solar cells (DSCs), the performance of which is not yet satisfactory and still remains less well explored. Herein, we report the application of new copper complexes bearing a tetradentate polythioether ligand, [(S-4)Cu](2+/+) (1(2+/+), S-4 = 1,4,8,11-tetrathiocyclotetradecane), as a redox mediator in DSCs in comparison with its N-4-tetradentate counterpart [(N-4)Cu](2+/+) (2(2+/+), N-4 = 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane). Impressively, the changes of coordination atoms from N to S positively shift the formal redox potential of the copper complexes by 600 mV, leading to a remarkably high photovoltage approaching 1.0 V. This is one of the highest photovoltage values reported thus far for DSCs based on copper redox mediators.
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