Compositional and metal-insulator transition characteristics of sputtered vanadium oxide thin films on yttria-stabilized zirconia |
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Authors: | Gokul Gopalakrishnan and Shriram Ramanathan |
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Affiliation: | (1) School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA |
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Abstract: | Vanadium dioxide (VO2) thin films have been shown to undergo a rapid electronic phase transition near 70 °C from a semiconductor to a metal, making
it an interesting candidate for exploring potential application in high speed electronic devices such as optical switches,
tunable capacitors, and field effect transistors. A critical aspect of lithographic fabrication in devices utilizing electric
field effects in VO2 is the ability to grow VO2 over thin dielectric films. In this article, we study the properties of VO2 grown on thin films of Yttria-Stabilized Zirconia (YSZ). Near room temperature, YSZ is a good insulator with a high dielectric
constant ($\epsilon _{\rm r} > 25$\epsilon _{\rm r} > 25). We demonstrate the sputter growth of polycrystalline VO2 on YSZ thin films, showing a three order resistivity transition near 70 °C with transition and hysteresis widths of approximately
7 °C each. We examine the relationship between chemical composition and transition characteristics of mixed phase vanadium
oxide films. We investigate changes in composition induced by low temperature post-deposition annealing in oxidizing and reducing
atmospheres, and report their effects on electronic properties. |
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