Supramolecular Hemicage Cobalt Mediators for Dye-Sensitized Solar Cells.
A 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-2AM 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.
Ecole Polytechnique Fédérale de Lausanne, Laboratory for Photomolecular Science, Institute of Chemical Sciences and Engineering, Station 6, Lausanne, 1015, Switzerland.|Uppsala University, Physical Chemistry, Ångström Laboratory, Box 523, Uppsala, 75120, Sweden.
Marina
M
Freitag
Uppsala University, Physical Chemistry, Ångström Laboratory, Box 523, Uppsala, 75120, Sweden.
Wenxing
W
Yang
Chemical Informatics Research Group, Chemical Science Division, Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Stop 8320, Gaithersburg, Maryland, 20899-8320, USA.
Lisa A
LA
Fredin
Uppsala University, Physical Chemistry, Ångström Laboratory, Box 523, Uppsala, 75120, Sweden.
Luca
L
D'Amario
Dyenamo AB, Teknikringen 38 A, 11428, Stockholm, Sweden.
K Martin
KM
Karlsson
Ecole Polytechnique Fédérale de Lausanne, Laboratory for Photomolecular Science, Institute of Chemical Sciences and Engineering, Station 6, Lausanne, 1015, Switzerland.|Uppsala University, Physical Chemistry, Ångström Laboratory, Box 523, Uppsala, 75120, Sweden.
Anders
A
Hagfeldt
Uppsala University, Physical Chemistry, Ångström Laboratory, Box 523, Uppsala, 75120, Sweden.
Gerrit
G
Boschloo
cobalt; dye-sensitized solar cells; photovoltaics; redox mediator; stability
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