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Article

A Rational Fabrication Method for Low Switching-Temperature VO2

1
Centre for Energy Research, Institute of Technical Physics and Materials Science, Konkoly-Thege M. út 29–33, 1121 Budapest, Hungary
2
Department of Physics, Budapest University of Technology and Economics, Budafoki út 8, 1111 Budapest, Hungary
*
Author to whom correspondence should be addressed.
Nanomaterials 2021, 11(1), 212; https://doi.org/10.3390/nano11010212
Received: 20 December 2020 / Revised: 7 January 2021 / Accepted: 12 January 2021 / Published: 15 January 2021
(This article belongs to the Special Issue Nanotechnology for Electronic Materials and Devices)
Due to its remarkable switching effect in electrical and optical properties, VO2 is a promising material for several applications. However, the stoichiometry control of multivalent vanadium oxides, especially with a rational deposition technique, is still challenging. Here, we propose and optimize a simple fabrication method for VO2 rich layers by the oxidation of metallic vanadium in atmospheric air. It was shown that a sufficiently broad annealing time window of 3.0–3.5 h can be obtained at an optimal oxidation temperature of 400 °C. The presence of VO2 was detected by selected area diffraction in a transmission electron microscope. According to the temperature dependent electrical measurements, the resistance contrast (R30 °C/R100 °C) varied between 44 and 68, whereas the optical switching was confirmed using in situ spectroscopic ellipsometric measurement by monitoring the complex refractive indices. The obtained phase transition temperature, both for the electrical resistance and for the ellipsometric angles, was found to be 49 ± 7 °C, i.e., significantly lower than that of the bulk VO2 of 68 ± 6 °C. View Full-Text
Keywords: phase transition; thermal oxidation; thermochromism phase transition; thermal oxidation; thermochromism
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MDPI and ACS Style

Pósa, L.; Molnár, G.; Kalas, B.; Baji, Z.; Czigány, Z.; Petrik, P.; Volk, J. A Rational Fabrication Method for Low Switching-Temperature VO2. Nanomaterials 2021, 11, 212. https://doi.org/10.3390/nano11010212

AMA Style

Pósa L, Molnár G, Kalas B, Baji Z, Czigány Z, Petrik P, Volk J. A Rational Fabrication Method for Low Switching-Temperature VO2. Nanomaterials. 2021; 11(1):212. https://doi.org/10.3390/nano11010212

Chicago/Turabian Style

Pósa, László, György Molnár, Benjamin Kalas, Zsófia Baji, Zsolt Czigány, Péter Petrik, and János Volk. 2021. "A Rational Fabrication Method for Low Switching-Temperature VO2" Nanomaterials 11, no. 1: 212. https://doi.org/10.3390/nano11010212

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