Dresden 2017 – scientific programme

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DS: Fachverband Dünne Schichten

DS 39: Thin Film Applications

DS 39.2: Talk

Thursday, March 23, 2017, 09:45–10:00, CHE 91

Co-doping of VO₂ with W and Sr for intelligent glazing — •Florian Kuhl, Angelika Polity, and Peter J. Klar — I. Physikalisches Institut, Justus Liebig University, Heinrich-Buff-Ring 16, DE-35392 Giessen, Germany

Vanadiumdioxide is a thermochromic material that undergoes a semiconductor-to-metal transition (SMT) at about 68 ^∘C due to a phase change from monoclinic to rutile phase. At this transition the transmittance and reflectivity in the near infrared is decreased, thus it is an interesting material for intelligent window coatings for controling the temperature in buildings passively. But due to its transition temperature and optical properties, VO₂ thin films are not used for window coatings. Literature reports that the doping with tungsten will decrease the transition temperature and the doping with alkaline earth metals like Sr will enhance the optical properties.
We present our results on thin films that are co-doped with W and Sr in the rf sputtering process. With this method we can use both effects. On the one hand the transition temperature is reduced and on the other hand the optical properties can be improved so that the thin films show comparable properties to comercially available electrochromic window glazings. Furthermore we produced multi layer systems with anti reflective coatings to obtain coatings with enhanced properties for the use as intelligent glazings.