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- Title
A Bis(tridentate)cobalt Polypyridine Complex as Mediator in Dye-Sensitized Solar Cells.
- Authors
Mengel, Andreas K. C.; Cho, Woohyung; Breivogel, Aaron; Char, Kookheon; Soo Kang, Yong; Heinze, Katja
- Abstract
Dye-sensitized solar cells equipped with cationic and neutral RuII-based sensitizers [Ru(ddpd){tpy(COOH)3}]2+ [12+; ddpd = N,N'-dimethyl-N,N'-di(pyridin-2-yl)pyridin-2,6-diamine, tpy(COOH)3 = 2,2''6',2''-terpyridine-4,4',4''-tricarboxylic acid] and [Ru(ddpd){tpy(COOH)(COO)2}] (2) with and without the coadsorbent chenodeoxycholic acid were constructed with I3 -/I- or the CoIII/II-based redox mediators [Co- (bpy)3]3+/2+ (33+/2+; bpy = 2,2'-bipyridine) and [Co- (ddpd)2]3+/2+ (43+/2+) in the presence of LiClO4 and 4-tert-butylpyridine. The best photovoltaic performance was achieved by using the 43+/2+ shuttle and the neutral sensitizer 2 without coadsorbent. The higher short-circuit photocurrent density and higher electron recombination lifetimes obtained with this combination suggest slow electron recombination kinetics at the TiO2 surface with the CoIII complex 43+. The slow electron transfer to 43+ is tentatively ascribed to the high-lying π* orbitals of the electron-rich ddpd ligands, which result in a weak electronic coupling. This contrasts with the faster recombination with 33+, which features the low-energy π* orbitals of the bpy ligands.
- Subjects
DYE-sensitized solar cells; POLYPYRIDINES; ELECTRON recombination; EFFICIENCY of photovoltaic cells; CHENODEOXYCHOLIC acid; PHOTOCURRENTS
- Publication
European Journal of Inorganic Chemistry, 2015, Vol 2015, Issue 20, p3299
- ISSN
1434-1948
- Publication type
Article
- DOI
10.1002/ejic.201500252