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Photoconductive, dielectric and percolation properties of anodic TiO.sub.2./sub. nanotubes studied by terahertz spectroscopy
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SYSNO ASEP 0489478 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Photoconductive, dielectric and percolation properties of anodic TiO2 nanotubes studied by terahertz spectroscopy Author(s) Kuchařík, Jiří (FZU-D) ORCID
Sopha, H. (CZ)
Krbal, M. (CZ)
Rychetský, Ivan (FZU-D) RID, ORCID
Kužel, Petr (FZU-D) RID, ORCID, SAI
Macák, J. M. (CZ)
Němec, Hynek (FZU-D) RID, ORCID, SAINumber of authors 7 Article number 014004 Source Title Journal of Physics D-Applied Physics. - : Institute of Physics Publishing - ISSN 0022-3727
Roč. 51, č. 1 (2018), s. 1-9Number of pages 9 s. Language eng - English Country GB - United Kingdom Keywords anodic TiO2 nanotubes ; terahertz spectroscopy ; charge transport ; dielectric properties Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects GA17-03662S GA ČR - Czech Science Foundation (CSF) Institutional support FZU-D - RVO:68378271 UT WOS 000417809200001 EID SCOPUS 85038612206 DOI 10.1088/1361-6463/aa9b11 Annotation Self-organized layers of anodic TiO2 nanotubes were investigated by time-resolved terahertz spectroscopy in the steady state and upon photoexcitation. The interpretation of the conductivity spectra is based on the response of confined charges calculated by the Monte-Carlo method and on the evaluated distribution of the probing terahertz electric field in the heterogeneous structure. We show that the charge motion perpendicular to the nanotube axis is confined on ~10 nm scale, and that the charge mobility inside these confinement areas is comparable to that observed in a bulk anatase crystal. The electrical connectivity between individual nanotubes assessed from the terahertz spectra qualitatively correlates with the geometry observed in SEM images. The measured transient terahertz transmission spectra feature an apparent resonance. We demonstrate that it is not a signature of a new low-energy excitation but a geometrical effect of Fabry–Pérot interferences in the photoexcited slab. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2019
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