Regensburg 2022 – scientific programme

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DS: Fachverband Dünne Schichten

DS 20: Poster

DS 20.48: Poster

Wednesday, September 7, 2022, 16:00–18:00, P3

Improvement of the Architecture of Water-Based Dye-Sensitized Solar Cells — •Sara Domenici, Andreas Ringleb, and Derck Schlettwein — Justus-Liebig-Universität Gießen, Institut für Angewandte Physik

Dye-sensitized solar cells (DSSCs) have emerged as a possible alternative technology for the conversion of sunlight into electrical energy. Aqueous electrolytes would considerably increase their sustainability. Aside from chemical instabilities, the power conversion efficiencies of aqueous DSSCs remain significantly lower compared to other DSSCs. One main problem which is dealt with in the present work, consist in low diffusion coefficients of appropriate redox couples. Aqueous DSSCs were assembled using screen-printed TiO₂ semiconducting layers sensitized with an organic dye, XY1b. The redox couple was TEMPO/TEMPO⁺ dissolved in aqueous LiClO₄ with MBI added as organic corrosion inhibitor. To improve the accessibility of the photoanodes for the redox couple, the size of TiO₂ nanoparticles was varied. Further, this helps to add a scattering layer. In a second approach, the sealing method for the cells was adjusted. For instance, the distance between the working electrode and the counter electrode was tuned by using different sealant materials, such as hotmelt foils or UV glue, in order to allow short pathways for ion conduction. In this context, interactions of different sealant materials and the organic redox mediators have to be considered. The influence of the different approaches on cell efficiency will be discussed.