Photoconductive, dielectric and percolation properties of anodic TiO2 nanotubes studied by terahertz spectroscopy

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F18%3A39911317" target="_blank" >RIV/00216275:25310/18:39911317 - isvavai.cz</a>
Alternative codes found
RIV/68378271:_____/18:00489478
Result on the web
<a href="https://iopscience.iop.org/article/10.1088/1361-6463/aa9b11" target="_blank" >https://iopscience.iop.org/article/10.1088/1361-6463/aa9b11</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1361-6463/aa9b11" target="_blank" >10.1088/1361-6463/aa9b11</a>

Result language
angličtina
Original language name
Photoconductive, dielectric and percolation properties of anodic TiO2 nanotubes studied by terahertz spectroscopy
Original language description
Self-organized layers of anodic TiO2 nanotubes were investigated using 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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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