Flores-Diaz, NatalieBahng, Hee-wonVlachopoulos, NikolaosMoser, Jacques-E.Zakeeruddin, Shaik M.Gratzel, MichaelHagfeldt, Anders2019-07-052021-04-152019-07-052019-05-1410.1039/c9ta00490dhttps://infoscience.epfl.ch/handle/20.500.14299/158882WOS:000472225200014A new tandem electrolyte composed of two redox pairs, the organic radical 2-azaadamantane-N-oxyl (AZ) and the well-known redox pair [Co(bpy)(3)](3+/2+) was investigated in dye sensitized solar cells. Importantly, an increase in V-OC was achieved using the new tandem redox system with values up to 1007 mV, compared to only 896 mV for the reference [Co(bpy)(3)](3+/2+) couple. Consequently, the tandem electrolytes presented higher device performance in conjunction with the organic dye XY1. It was determined that the V-OC improvement is mainly attributed to the combined effect of two factors: the more positive redox potential of the small donor AZ (0.81 V vs. SHE) and improved recombination resistance in the tandem electrolytes.Chemistry, PhysicalEnergy & FuelsMaterials Science, MultidisciplinaryChemistryEnergy & FuelsMaterials Sciencesensitized solar-cellsefficiencyrecombinationelectrolytekineticstext::journal::journal article::research article