Dresden 2020 – wissenschaftliches Programm
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DS 31.2: Poster
Mittwoch, 18. März 2020, 15:00–18:00, P1A
Improvement of TiO2 VO2 multi-layers for application in thermochromic window-glazing — •Lukas Frommel, Martin Becker, Philip Klement, Florian Kuhl, Sebastian Benz, Jonas Hauptmann, Jörg Schörmann, and Sangam Chatterjee — Institute of Experimental Physics I and Center for Materials Research, Heinrich-Buff-Ring 16, Justus Liebig University Giessen, D-35392 Giessen, Germany
Thermochromic window glazing is a possible innovation to optimize the heat exchange in buildings. Vanadiumdioxid is a promising material for this application, because of a reversible insulator-to-metal transition at 68∘C. To modify the characteristic temperature of this transition, a TiO2 buffer layer can be used. While conventional preparation methods fail in terms of lateral upscaling, a new synthesis route for larger scales needs to be established.
Here, we prepare TiO2 thin films by atomic layer deposition. Under variation of the process parameters, reactor temperature and precursor pulse times among others, different types and phases of TiO2 are deposited and examined via X-Ray Reflectometry, Atomic Force Microscopy and Raman Spectroscopy. A VO2 layer on top is prepared by rf-sputtering and the resulting multi-layer structure examined via UV-NIR Spectroscopy. The thickness and different structures of the TiO2 buffer layer were found to significantly affect the switching properties of the VO2.