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Materials 2017, 10(5), 554; doi:10.3390/ma10050554

Switching VO2 Single Crystals and Related Phenomena: Sliding Domains and Crack Formation

Physics Department, Technion, Haifa 32000, Israel
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Author to whom correspondence should be addressed.
Academic Editor: Horng-Tay Jeng
Received: 24 April 2017 / Revised: 9 May 2017 / Accepted: 11 May 2017 / Published: 19 May 2017
(This article belongs to the Special Issue Metal-Insulator Transition)
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Abstract

VO2 is the prototype material for insulator–metal transition (IMT). Its transition at TIMT = 340 K is fast and consists of a large resistance jump (up to approximately five orders of magnitude), a large change in its optical properties in the visible range, and symmetry change from monoclinic to tetragonal (expansion by 1% along the tetragonal c-axis and 0.5% contraction in the perpendicular direction). It is a candidate for potential applications such as smart windows, fast optoelectronic switches, and field-effect transistors. The change in optical properties at the IMT allows distinguishing between the insulating and the metallic phases in the mixed state. Static or dynamic domain patterns in the mixed-state of self-heated single crystals during electric-field induced switching are in strong contrast with the percolative nature of the mixed state in switching VO2 films. The most impressive effect—so far unique to VO2—is the sliding of narrow semiconducting domains within a metallic background in the positive sense of the electric current. Here we show images from videos obtained using optical microscopy for sliding domains along VO2 needles and confirm a relation suggested in the past for their velocity. We also show images for the disturbing damage induced by the structural changes in switching VO2 crystals obtained for only a few current–voltage cycles. View Full-Text
Keywords: insulator–metal-transition; Joule-heating-induced-switching; electric current-induced self-heating; negative-differential-resistivity (NDR); Seebeck coefficient; Peltier coefficient insulator–metal-transition; Joule-heating-induced-switching; electric current-induced self-heating; negative-differential-resistivity (NDR); Seebeck coefficient; Peltier coefficient
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Fisher, B.; Patlagan, L. Switching VO2 Single Crystals and Related Phenomena: Sliding Domains and Crack Formation. Materials 2017, 10, 554.

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