Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 10: Organic Electronics and Photovoltaics (organized by DS)
TT 10.14: Vortrag
Montag, 16. März 2015, 12:45–13:00, H 2032
Device-like calcium corrosion test for ultra-barrier materials — •Frederik Nehm1, Hannes Klumbies1, John Fahlteich2, Felix Dollinger1, Karl Leo1, and Lars Müller-Meskamp1 — 1Institut für Angewandte Photophysik, TU Dresden, Dresden, Deutschland — 2Fraunhofer FEP, Dresden, Deutschland
The continuous progress of organic electronics demands for flexible moisture barriers with water vapor transmission rates (WVTRs) below 10−4 g(H2O)/m2d and quick, reliable measurement techniques for such WVTRs. The electrical calcium corrosion test is an extremely sensitive technique used widely in research groups. However, setups differ strongly as do their accuracy and background rates. We report on common issues and show how we manage them in our setup. Barrier corrosion because of direct water condensation on its surface is prevented by a glued-on PET film and Ca-induced stress is mitigated by organic decoupling layers. We demonstrate the effectiveness of our approach with studies on sputtered Zinc-Tin-Oxide and atomic layer deposited (ALD) alumina moisture barriers in different aging climates. Single barriers show a linear WVTR increase with rising absolute humidity at given temperature. Below 40∘C, this is even valid independent of temperature. A divergence at higher temperatures probably originates from the actual barrier layer, since this effect cannot be observed for the pure substrate. Also, nanolaminates using ALD alumina, titania and alkoxide, and multilayer barriers with polymer interlayers with WVTRs down to at least 2· 10−5 g(H2O)/m2d in 38∘C, 90% relative humidity environments are investigated.