Berlin 2008 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 16: Functional Oxides

DS 16.4: Hauptvortrag

Dienstag, 26. Februar 2008, 18:00–18:30, H 2032

Electrochromic coatings and windows — •Sabine Heusing — INM-Leibniz-Institut für Neue Materialien gGmbH, Campus D2 2, D-66123 Saarbrücken, Germany, e-mail: sabine.heusing@inm-gmbh.de

Electrochromic (EC) windows, also called "smart windows", change their optical properties (transmittance or reflection) in a reversible manner when a voltage is applied and a current flows through them. Large EC glazing are of considerable interest for architectural, automotive and aeroplane applications in order to control the solar radiation entrance to save energy costs for air conditioning in summer and for heating in winter (especially for buildings and automotives) and also to add comfort factors like privacy and to avoid glare and fading. EC windows have usually the configuration glass/ TCO/ EC-layer(1)/ electrolyte/ EC-layer(2) or ion-storage (IS) layer/ TCO/ glass, whereby TCO means transparent conductive oxide as e.g. tin doped indium oxide (ITO). As EC layer different metal oxides as cathodic electrochromic tungsten oxide and niobium oxide or anodic electrochromic nickel oxide can be used. These materials change their transmission reversibly by reduction (or oxidation) and insertion (extraction) of small ions (e.g. H+, Li+). The most studied EC material is the tungsten oxide due to its high coloration efficiency. The electrochromic materials and the electro-optical methods for characterisation of the EC-layers and the EC-windows will be presented. Furthermore the different techniques for the production of EC-layers and EC-windows will be shown and an overview of the large area EC glazing on the market or in prototype production and their typical features will be given.