Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 6, Pages 5319-5327Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b13217
Keywords
VO2; phase transition temperature; strain tuning; film thickness; interface roughness
Funding
- U.S. National Science Foundation (Ceramic Program) [DMR-1565822]
- U.S. Office of Naval Research [N00014-16-1-2778]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1565822] Funding Source: National Science Foundation
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Vanadium dioxide (VO2) thin films with controlled thicknesses are deposited on c-cut sapphire substrates with Al-doped ZnO (AZO) buffer layers by pulsed laser deposition. The surface roughness of AZO buffer layers is varied by controlling oxygen pressure during growth. The strain in the VO2 lattice is found to be dependent on the VO2 thickness and the VO2/AZO interface roughness. The semiconductor-to-metal transition (SMT) properties of VO2 thin films are characterized and the transition temperature (T-c) is successfully tuned by the VO2 thickness as well as the VO2/AZO interface roughness. It shows that the T-c of VO2 decreases with the decrease of film thickness or VO2/AZO interface roughness. Other SMT properties of the VO2 films are maintained during the T-c tuning. The results suggest that the strain tuning induced by AZO buffer provides an effective approach for tuning T-c of VO2 continuously.
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