Dresden 2006 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 27: POSTER Polymer Physics and Materials
CPP 27.32: Poster
Donnerstag, 30. März 2006, 17:00–19:00, P2
Electrode Stability in Electrochromic Systems Based On Flexible Substrates — •Roland Wagner1,2, Roland Weiss1, Gotthard Rieger1, and Jürgen R. Niklas2 — 1Siemens AG Corporate Technology, Dept. CT MM 1, Erlangen, Germany — 2Technical University Bergakademie Freiberg, Freiberg, Germany
Electrochromic (EC) systems use materials that change their color when an electrical voltage is applied. Due to redox processes the intra molecular electron configuration is affected causing different absorption spectra. Electrodes of this EC system are exposed to an aggressive environment, as electrons are exchanged at the interface of solvent based electrolytic EC material and flexible electrodes. Especially the transparent top electrode, which is typically ITO on thin PET films, degrades during device operation. Metals (e.g. Cu), TCO and polymer (e.g. pedot) based materials are tested as back and top electrode for its degradation under different conditions, e.g. accelerated lifetime tests and voltage cycling. Optical and electrical properties like contrast and current behavior are discussed as well as degradation processes and mechanisms.