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Light-tuned DC conductance of anatase TiO2 nanotubular arrays: Features of long-range charge transport

Zimnyakov, D. A.; Vasilkov, M. Y.; Yuvchenko, S. A.; Varezhnikov, A. S.; Sommer, M. 1; Sysoev, V. V.
1 Institut für Mikrostrukturtechnik (IMT), Karlsruher Institut für Technologie (KIT)


Experimental results related to the photoactivated dc conductance of anatase TiO₂ nanotubular arrays (aTNTAs) under pulsed irradiation by a laser light inside and outside the fundamental absorption band are presented. It is found that the mobility and diffusion coefficients of charge carriers in the examined aTNTA are extremely low due to a strong charge-phonon coupling, abundance of shallow traps, and hopping conductivity between adjacent nanotubes. We consider that the confining electric field appeared within the array structure due to the difference in the local concentrations of excess electrons and holes at large values of the dc conductance suppresses the drift current. In this case, the dc conductance of such aTNTAs is mainly matured by the diffusion of mobile carriers. A recurrent kinetic model for evolution of the dc conductance of aTNTAs under laser irradiation has been proposed to interpret the experimental results.

Verlagsausgabe §
DOI: 10.5445/IR/1000087869
DOI: 10.3390/nano8110915
Zitationen: 4
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2018
Sprache Englisch
Identifikator ISSN: 2079-4991
KITopen-ID: 1000087869
HGF-Programm 43.22.01 (POF III, LK 01) Functionality by Design
Erschienen in Nanomaterials
Verlag MDPI
Band 8
Heft 11
Seiten Art. Nr.: 915
Schlagwörter anatase nanotubes, dc conductance, laser irradiation, inter-band transition, Urbach energy, charge mobility, drift current; diffusion current
Nachgewiesen in Web of Science
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