Berlin 2015 – scientific programme

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DS: Fachverband Dünne Schichten

DS 36: Poster Session I

DS 36.19: Poster

Thursday, March 19, 2015, 09:30–12:00, Poster A

Growth and Modification of single-crystalline VO₂ Nanostructures — •Alexander Tille, Tim Barth, Jura Rensberg, and Carsten Ronning — Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany

Unstrained single-crystalline Vanadium dioxide (VO₂) nanostructures show an extremely sharp metal-insulator phase transition (MIT) at a critical temperature of 68 ^∘C. Phase pure VO₂ has a narrow existence region in the V-O-phase diagram, thus mixed vanadium oxides (VO_x) are easily obtained by thermal annealing of VO₂ in either reducing or oxidizing environment. In this work free-standing, single-crystalline VO₂ nanowires were grown on SiO₂ substrates using an evaporation method. After transfer to a clean insulating substrate, NWs were annealed up to 600 ^∘C in both ambient atmosphere and high vacuum. In both cases, temperature dependent electrical measurements show a shift of the critical temperature to lower values. Furthermore, temperature dependent Raman spectroscopy reveals a correlation between this shift and the structural properties of the NWs. Thus, we gained a deeper insight in the relationship between the structure and the critical temperature of the MIT.