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Baik, Jeong Min
Nano Energy and Environmental Materials Lab
Research Interests
  • Nanogenerators, antimicrobial material, catalysis, smart sensors

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Unravelling the switching mechanisms in electric field induced insulator-metal transitions in VO2 nanobeams

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Title
Unravelling the switching mechanisms in electric field induced insulator-metal transitions in VO2 nanobeams
Author
Rathi, ServinPark, Jin-HyungLee, In-yealBaik, Jeong MinYi, Kyung SooKim, Gil-Ho
Keywords
insulator-metal transitions; Joule heating; Poole-Frenkel effect; vanadium dioxide nanobeams
Issue Date
201407
Publisher
IOP PUBLISHING LTD
Citation
JOURNAL OF PHYSICS D-APPLIED PHYSICS, v.47, no.29, pp.1 - 8
Abstract
We studied insulator-metal transitions in VO2 nanobeams for both abrupt and gradual changes in applied electric fields. Based on the observations, the Poole-Frenkel effect explained the abrupt transition, while the gradual case is found to be dominated by the Joule heating phenomenon. We also carried out power model and finite element method based simulations which supported the Joule heating phenomena for gradual transition. An in-principle demonstration of the Poole-Frenkel effect, performed using a square voltage pulse of 1 μ s duration, further confirms the proposed insulator-metal transition mechanism with a switching time in the order of 100 ns. Finally, conductivity variations introduced via rapid thermal annealing at various temperatures validate the roles of both Joule heating and Poole-Frenkel mechanisms in the transitions.
URI
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DOI
http://dx.doi.org/10.1088/0022-3727/47/29/295101
ISSN
0022-3727
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