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Investigation of transparent conductive silver based de-icing coatings for automotive application

: Nyderle, R.; Kopte, T.; Preussner, T.

Society of Vacuum Coaters -SVC-, Albuquerque/NM:
Society of Vacuum Coaters. 51st Annual Technical Conference 2008. Proceedings : April 19 - 24, 2008, Chicago, IL, USA
Albuquerque: SVC, 2008
Society of Vacuum Coaters (Annual Technical Conference) <51, 2008, Chicago/Ill.>
Conference Paper
Fraunhofer FEP ()
transparent conductive film; de-icing layer; automotive application; magnetron sputtering

Together with the introduction of LED technology into automotive front headlights de-icing of the headlight covers is required due to lower heat transfer from the light emitter. A solution is the introduction of a conductive layer stack for de-icing of the diffuser panels. Different materials as bottom and top layers in a silver based three layer stack have been investigated with respect to the durability and electrical and optical properties of the transparent conductive film. The transparent conductive multilayer-stacks have been deposited by means of pulsed magnetron sputtering onto rigid plastic plates and on float glass.
Results are presented from the investigation of the influence of different dielectric and conductive oxide layers onto silver based transparent conductive multilayer-stacks for automotive application. AZO based coatings do not protect the Ag layer from degradation during the salt water test, while nonconductive oxides as TiO2 and Nb2O5 provide good protection. Internal resistance heating of the conductive coatings caused the resistance to drop by at least 10 % during first time heating, while further heating and cooling cycles did not affect the resistance.