Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 32: Poster Tuesday: Adsorption and Catalysis 1

O 32.1: Poster

Dienstag, 6. September 2022, 11:00–13:00, P3

Analysis of Electron-Transfer in Water-Based Dye-Sensitized Solar Cells — •Daniel Holzhacker¹, Andreas Ringleb¹, Raffael Ruess², and Derck Schlettwein¹ — ¹Justus-Liebig-Universität Gießen, Institut für Angewandte Physik — ²Justus-Liebig-Universität Gießen, Physikalisch-Chemisches Institut

Dye-sensitized solar cells (DSSCs) present a possible low-cost technology for the conversion of sunlight into electrical energy. Most DSSCs are based on electrolytes with organic solvents. Due to environmental reasons it is attractive to replace organic solvents by water. In view of the damage typically caused to DSSCs by water contaminations, the use of water as contact solution represents a big challenge. Complete aqueous DSSCs were assembled with a combination of different organic dyes (D51, D35 and Y123) and organic redox mediators (TEMPO, AZADO and TEMPOL). The combination of Y123 and TEMPO yielded remarkable efficiencies of up to 4.4%. Although heavily limited in the fill factor, TEMPOL proved to be an interesting alternative, as its solubility in water is dramatically increased in comparison to TEMPO. Similar open circuit voltages and short circuit currents were reached but large overpotentials of electron transfer at the electrodes still limited TEMPOL-based cells. Subsequently, the electrolyte and electrode surfaces were modified in order to reduce the respective overpotentials.