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Postdeposition treatment of IBS coatings for UV applications with optimized thin-film stress properties

: Bischoff, Martin; Nowitzki, Tobias; Voß, Oliver; Wilbrandt, Steffen; Stenzel, Olaf


Applied optics 53 (2014), No.4, pp.A212-A220
ISSN: 0003-6935
ISSN: 1539-4522
ISSN: 1559-128X
Bundesministerium für Wirtschaft und Technologie BMWi
Journal Article
Fraunhofer IOF ()
post deposition treatment; thin-film stress

Ion-beam-sputtering (IBS) single-layer and multilayer coating designs for UV applications were examined after the deposition process as well as after a defined postdeposition treatment. High internal compressive film stress as well as moderate absorption losses in the UV spectral range were measured at the as-deposited thin films. Due to a controlled postdeposition treatment process, the absorption losses and the high compressive stress can be reduced significantly. We show that the remaining thin-film stress of SiO2 and HfO2 multilayer designs can be specifically manipulated by the parameters of the postdeposition treatment. Even zero and tensile stress can be achieved for complex multilayer coatings.