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Issue 41, 2020
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The split-off terahertz radiating dipoles on thermally reduced α-V2O5 (001) surface

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Abstract

The trapped electron states on a pliable lattice have different localization and physical chemistry characteristics. Here, terahertz time-domain measurements suggest that the formation of vanadyl oxygen defect, in the presence of the surface potential traps and mobile charge carriers, leads to a transient charge distribution that forms terahertz radiating dipoles in V2O5. The emergence of radiating dipoles is evidenced by terahertz responses with a two-valley feature of the thermally reduced α-V2O5 (001) thin films in the temperature range of 300–700 K. The two photoconductance valleys on a several millielectron volts interval are related to two emergent split-off traps, which originate from the VO6 octahedra distortion upon the vanadyl oxygen desorption on the surface. The pliable surface lattices plays a decisive role. So long as the α-V2O5 (001) thin films are covered by a 30 nm-thick Al2O3 capping layer, the distinct two-valley feature disappears completely in the full temperature range. The terahertz radiating dipoles with a fine energy structure is potentially a new measure for charge dynamics on the α-V2O5 (001) surface.

Graphical abstract: The split-off terahertz radiating dipoles on thermally reduced α-V2O5 (001) surface

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Article information


Submitted
20 May 2020
Accepted
29 Sep 2020
First published
02 Oct 2020

Nanoscale, 2020,12, 21368-21375
Article type
Paper

The split-off terahertz radiating dipoles on thermally reduced α-V2O5 (001) surface

Q. J. Wang, H. Wang, Z. H. Zhou, J. Zuo and C. L. Zhang, Nanoscale, 2020, 12, 21368
DOI: 10.1039/D0NR03889J

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