title: Importance of Interface Diffusion and Climate in Defect Dominated Moisture Ultrabarrier Applications.
abstract: OLEDs and organic photovoltaic (OPV) devices require encapsulation from water vapor using a permeation barrier system. As a benchmark for barrier quality, often only a single number is provided as water vapor transmission rate. However, this value is highly dependent on the aging climate. So far, little scientific effort has been undertaken to characterize ultrahigh moisture barriers at different temperatures and relative humidities. We present Ca-test studies on sputtered Zinc-Tin-Oxide and atomic layer deposited AlOx barriers in extensively varied climates. Relative humidities are changed at constant temperatures, and temperatures are changed at constant absolute humidity. We find Henry's law to apply for sorption and discover a fundamental change of the diffusion regime with time related to the interface between the test and the barrier thin-film.
authors.affiliation: Institut für Angewandte Photophysik, Technische Universität Dresden , 01062 Dresden, Germany.
authors.forename: Frederik
authors.initials: F
authors.lastname: Nehm
authors.affiliation: Institut für Angewandte Photophysik, Technische Universität Dresden , 01062 Dresden, Germany.
authors.forename: Felix
authors.initials: F
authors.lastname: Dollinger
authors.affiliation: Fraunhofer Institut für Organische Elektronik, Elektronenstrahl- und Plasmatechnik (FEP), Winterbergstraße 28, 01277 Dresden, Germany.
authors.forename: John
authors.initials: J
authors.lastname: Fahlteich
authors.affiliation: Institut für Angewandte Photophysik, Technische Universität Dresden , 01062 Dresden, Germany.
authors.forename: Hannes
authors.initials: H
authors.lastname: Klumbies
authors.affiliation: Institut für Angewandte Photophysik, Technische Universität Dresden , 01062 Dresden, Germany.
authors.forename: Karl
authors.initials: K
authors.lastname: Leo
authors.affiliation: Institut für Angewandte Photophysik, Technische Universität Dresden , 01062 Dresden, Germany.
authors.forename: Lars
authors.initials: L
authors.lastname: Müller-Meskamp
keywords: activation energy; climate; diffusion; encapsulation; permeation; water vapor barrier