Dresden 2017 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 28: Poster: Fundamentals of Perovskite Photovoltaics (joint session CPP, DS, HL)
HL 28.24: Poster
Monday, March 20, 2017, 18:30–21:00, P1A
Stability and Performance of ZnO-based Dye-Sensitized Solar Cells in Contact to a Co(II/III) Redox Electrolyte — •Sebastian Haas1,2, Raffael Ruess1,2, and Derck Schlettwein1,2 — 1Justus-Liebig-University Giessen, Institute of Applied Physics — 2Justus-Liebig-University Giessen, Laboratory for Materials Science (LaMa)
The use of Co(II/III) electrolytes instead of the commonly used I−/I3− redox electrolyte represents an attractive way to increase the efficiency of dye-sensitized solar cells (DSSCs). By this approach, attractive efficiencies of up to 14.3 % were reached for TiO2-based cells. The present work is focused on DSSCs based on low temperature electrodeposited porous zinc oxide, to decrease further the already attractive energy payback time of DSSCs and allow preparation on temperature-sensitive substrates, e.g. polymer foils. Dye stability, electrolyte diffusion and recombination in the DSSC devices are studied by UV-Vis-spectroscopy, impedance spectroscopy and photo-current-transients. It was found that the dyes D149 and DN216 are not stable at the ZnO surface in the presence of the Co(II/III) redox couple. Furthermore, a small influence of a hindered diffusion in the DSSCs based on Co(II/III) redox couple compared with DSSCs based on I−/I3− redox electrolyte was observed.