@article {31522,
	title = {Correlating cobalt redox couples to photovoltage in the dye-sensitized solar cell},
	journal = {Dalton Trans.},
	volume = {47},
	year = {2018},
	pages = {11942-11952},
	abstract = {<p>We report a series of structurally analogous cobalt mediators related to [Co-bpy]Z (bpy = 2{,}2\&prime;-bipyrimidine{,} Z = 2+ or 3+) to demonstrate a linear relationship between the redox potential of the Co(iii/ii)-based redox couple (Emed) and open-circuit voltage (VOC) of the DSSC. The Emed values vary from 0.42 to 1.07 V vs. NHE depending on the number of nitrogen atoms and the presence of tert-butyl substituents on the ligand. A 64-mV gain in photovoltage was calculated for every +100 mV shift in Emed. Differences in the mediator sizes{,} diffusion coefficients{,} light absorption profiles{,} and spin state configurations for the complexes were not significant and therefore not expected to contribute to changes in the VOC. A decrease in the photocurrent{,} downward shift in quasi-Fermi level (EF{,}n) and shorter electron lifetime (Tn) with increasingly positive Emed were instead attributed to enhanced electron recombination from the TiO2 film to oxidized mediator species in the electrolyte.</p>},
	doi = {10.1039/C8DT01921E},
	url = {http://dx.doi.org/10.1039/C8DT01921E},
	author = {Chen, Kitty Y. and Schauer, Phil A. and Patrick, Brian O. and Berlinguette, Curtis P.}
}
