@article { ISI:000314794400052,
	title = {Atomic Level Resolution of Dye Regeneration in the Dye-Sensitized Solar Cell},
	journal = {JOURNAL OF THE AMERICAN CHEMICAL SOCIETY},
	volume = {135},
	number = {5},
	year = {2013},
	month = {FEB 6},
	pages = {1961-1971},
	abstract = {Two donor-acceptor organic dyes have been synthesized that differ only by a two-heteroatom change from oxygen to sulfur within the donor unit. The two dyes, (E)-3-(5-(4-(bis(4-(hexyloxy)phenyl)amino)phenyl)thiophen-2-yl)-2-cyanop rop-2-enoic acid (Dye-O) and (E)-3-(5-(4-(bis(4-(hexylthio)phenyl)amino)phenyl)thiophen-2-yl)-2-cyano prop-2-enoic acid) (Dye-S), were tested in solar cell devices employing both I-3(-)/I{\textendash}based and {[}Co(bpy)(3)](3+/2+) redox mediators. Power conversion efficiencies over 6\% under simulated AM 1.5 illumination (1 Sun) were achieved in both electrolytes. Despite similar optical and redox properties for the two dyes, a consistently higher open-circuit voltage (V-oc) was measured for Dye-S relative to Dye-O. The improved efficiency observed with Dye-S in an iodide redox mediator is against the commonly held view that sulfur atoms promote charge recombination attributed to inner-sphere interactions. Detailed mechanistic studies revealed that this is a consequence of a 25-fold enhancement of the regeneration rate constant that enhances the regeneration yield under open circuit conditions. The data show that a high short circuit photocurrent does not imply optimal regeneration efficiency as is often assumed.},
	issn = {0002-7863},
	doi = {10.1021/ja311640f},
	author = {Robson, Kiyoshi C. D. and Hu, Ke and Meyer, Gerald J. and Berlinguette, Curtis P.}
}
