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Lookup NU author(s): Professor Marina FreitagORCiD
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© 2016 Wiley-VCH Verlag GmbH & Co. KGaA, WeinheimA new class of dye-sensitized solar cells (DSSCs) using the hemicage cobalt-based mediator [Co(ttb)]2+/3+ with the highly preorganized hexadentate ligand 5,5′′,5′′′′-((2,4,6-triethyl benzene-1,3,5-triyl)tris(ethane-2,1-diyl))tri-2,2′-bipyridine (ttb) has been fully investigated. The performances of DSSCs sensitized with organic D–π–A dyes utilizing either [Co(ttb)]2+/3+ or the conventional [Co(bpy)3]2+/3+ (bpy=2,2′-bipyridine) redox mediator are comparable under 1000 W m−2 AM 1.5 G illumination. However, the hemicage complexes exhibit exceptional stability under thermal and light stress. In particular, a 120-hour continuous light illumination stability test for DSSCs using [Co(ttb)]2+/3+ resulted in a 10 % increase in the performance, whereas a 40 % decrease in performance was found for [Co(bpy)3]2+/3+ electrolyte-based DSSCs under the same conditions. These results demonstrate the great promise of [Co(ttb)]2+/3+ complexes as redox mediators for efficient, cost-effective, large-scale DSSC devices.
Author(s): Freitag M, Yang W, Fredin LA, D'Amario L, Karlsson KM, Hagfeldt A, Boschloo G
Publication type: Article
Publication status: Published
Journal: ChemPhysChem
Year: 2016
Volume: 17
Issue: 23
Pages: 3845-3852
Online publication date: 23/09/2016
Acceptance date: 08/09/2016
ISSN (print): 1439-4235
ISSN (electronic): 1439-7641
Publisher: Wiley-VCH Verlag
URL: https://doi.org/10.1002/cphc.201600985
DOI: 10.1002/cphc.201600985
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