Hydrogen-doping stabilized metallic VO2 (R) thin films and their application to suppress Fabry-Perot resonances in the terahertz regime

Yong Zhao, Gulten Karaoglan-Bebek, Xuan Pan, Mark Holtz, Ayrton A. Bernussi, Zhaoyang Fan

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

We demonstrate that catalyst-assisted hydrogen spillover doping of VO 2 thin films significantly alters the metal-insulator transition characteristics and stabilizes the metallic rutile phase at room temperature. With hydrogen inserted into the VO2 lattice, high resolution X-ray diffraction reveals expansion of the V-V chain separation when compared to the VO2(R) phase. The donated free electrons, possibly from O-H bond formation, stabilize the VO2(R) to low temperatures. By controlling the amount of dopants to obtain mixed insulating and metallic phases, VO 2 resistivity can be continuously tuned until a critical condition is achieved that suppresses Fabry-Perot resonances. Our results demonstrate that hydrogen spillover is an effective technique to tune the electrical and optical properties of VO2 thin films.

Original languageEnglish (US)
Article number241901
JournalApplied Physics Letters
Volume104
Issue number24
DOIs
StatePublished - Jun 16 2014
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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