S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Chemical and Biological Engineering (화학생물공학부) Journal Papers (저널논문_화학생물공학부)
Thiophene-nitroxide radical as a novel combination of sensitizer-redox mediator for dye-sensitized solar cells
- Lee, Jun Young; Lee, Chongchan; Lee, Yong Min; Cho, Kuk Young; Choi, Jang Wook; Park, Jung-Ki
- Issue Date
- Journal of Solid State Electrochemistry, Vol.16 No.2, pp.657-663
- We report a novel combination of organic sensitizer and redox mediator in the electrolyte for dye-sensitized solar cells (DSSCs): a thiophene dye and nitroxide radicals. Nitroxide radicals and their oxidized counterparts of oxoammonium cations show robust reversible redox reactions, thus supporting robust DSSC operations. Moreover, their redox potentials (E-1/2) and thus open-circuit voltages (V-OC) can be tuned further by attached functional groups. Optical and electrochemical characterization reveal that these new combinations exhibit enhanced V-OC and power conversion efficiencies compared to the existing iodine mediator (I-/I-3(-)) due to the increased V-OC. Also, the selection of the sensitizer-redox mediator turns out to be critical in the overall cell performance. Indeed, the typical ruthenium dye loses its light absorption capability when it is operated in conjunction with the nitroxide radicals.
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