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Charge transport in anodic TiO 2 nanotubes studied by terahertz spectroscopy
Author(s) -
Krbal Milos,
Kucharik Jiri,
Sopha Hanna,
Nemec Hynek,
Macak Jan M.
Publication year - 2016
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201600179
Subject(s) - photoexcitation , anatase , materials science , amorphous solid , anodizing , nanotechnology , charge carrier , nanotube , terahertz radiation , optoelectronics , chemical engineering , photocatalysis , carbon nanotube , excited state , chemistry , atomic physics , physics , aluminium , biochemistry , engineering , metallurgy , catalysis , organic chemistry
We report on the photoelectrochemical and terahertz measurements, of the charge transport properties of 1 μm thick self‐organized TiO 2 nanotube layers, prepared by the anodization of titanium. We provide evidence regarding the complexity of electron transport, and dynamics in the nanotubes. Shortly after photoexcitation, charge mobilites in amorphous and crystalline nanotubes are similar, but still lower compared to the bulk anatase. The mobility subsequently decreases due to trapping‐detrapping processes. The recombination rate in anatase nanotubes is much slower than in the amorphous ones, enabling the material to reach an internal photon to electron conversion efficiency exceeding 60%.