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A Bis(tridentate) cobalt Polypyridine Complex as Mediator in Dye-Sensitized Solar Cells

Title
A Bis(tridentate) cobalt Polypyridine Complex as Mediator in Dye-Sensitized Solar Cells
Author
강용수
Keywords
Solar cells; Dyes; Sensitizers; Electron transfer; Redox mediators; Cobalt; Ruthenium
Issue Date
2015-07
Publisher
WILEY-V C H VERLAG GMBH
Citation
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, NO 20, Page. 3299-3306
Abstract
Dye-sensitized solar cells equipped with cationic and neutral Ru-II-based sensitizers [Ru(ddpd){tpy(COOH)(3)}](2+) [1(2+); 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 I-3(-)/I- or the Co-III/II-based redox mediators [Co-(bpy)(3)](3+/2+) (3(3+/2+); bpy = 2,2'-bipyridine) and [Co-(ddpd)(2)](3+/2+) (4(3+/2+)) in the presence of LiClO4 and 4-tert-butylpyridine. The best photovoltaic performance was achieved by using the 4(3+/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 Co-III complex 4(3+). The slow electron transfer to 4(3+) is tentatively ascribed to the high-lying pi* orbitals of the electron-rich ddpd ligands, which result in a weak electronic coupling. This contrasts with the faster recombination with 3(3+), which features the low-energy pi* orbitals of the bpy ligands.
URI
http://onlinelibrary.wiley.com/doi/10.1002/ejic.201500252/fullhttp://hdl.handle.net/20.500.11754/26480
ISSN
1434-1948; 1099-0682
DOI
10.1002/ejic.201500252
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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