Berlin 2012 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 1: Interfaces and Thin Films I

CPP 1.4: Talk

Monday, March 26, 2012, 10:30–10:45, C 130

Improvement of Adsorption Stability of Indoline Sensitizers in Dye-Sensitized Solar Cells by Additional Binding Groups — •Jane Falgenhauer¹, Hidetoshi Miura², and Derck Schlettwein¹ — ¹Justus-Liebig-Universität Gießen, Institut für Angewandte Physik, Heinrich-Buff-Ring 16, D-35392 Gießen — ²Tsukuba Research Center, Chemicrea Inc., D-142-1-6, Sengen, Tsukuba, Ibaraki 305-0047, Japan

Dye-sensitized solar cells often suffer from desorption of sensitizer molecules during operation and in contact to a redox electrolyte. In particular for ZnO as active semiconductor material, an optimal dye has still to be found. In this study, novel indoline dyes with additional binding groups to the semiconductor surface were investigated. Their adsorption stability on ZnO was studied in comparison with the established indoline dye D149. The dyes were adsorbed on nanoporous electrodeposited ZnO with a co-adsorbent, chenodeoxycholic acid. The amount of dyes adsorbed to the films was measured by optical absorption spectroscopy. Under operation in contact to a typical redox electrolyte, the dyes showed different desorption probability. The amount of desorbed dyes in such a solution containing the electrolyte additive N−Methylbenzimidazole (NMBI) was also investigated by optical absorption spectroscopy, as well as the absorption of the films following these desorption experiments. The stability of the dyes in dependence on the number of binding groups at the sensitizer molecules will be discussed.