NDLI: Fast charge-carrier trapping in TiO2 nanotubes

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Fast charge-carrier trapping in TiO2 nanotubes

Content Provider	Semantic Scholar
Author	Wehrenfennig, Christian Palumbiny, Claudia M. Snaith, Henry J. Johnston, Michael B. Schmidt-Mende, Lukas Herz, Laura M.
Copyright Year	2015
Abstract	One-dimensional semiconductors such as nanowires and nanotubes are attractive materials for incorporation in photovoltaic devices as they potentially offer short percolation pathways to charge-collecting contacts. We report the observation of free-electron lifetimes in TiO2 nanotubes of the order of tens of picoseconds. These lifetimes are surprisingly short compared to those determined in films of TiO2 nanoparticles. Samples of ordered nanotube arrays with several different tube wall thicknesses were fabricated by anodization and have been investigated by means of optical-pump-terahertz-probe (OPTP) spectroscopy, which allows measurement of transient photoinduced conductivity with picosecond resolution. Our results indicate a two-stage decay of the photoexcited electron population. We attribute the faster component to temporary immobilization of charge in shallow trap states, from which electrons can detrap again by thermal excitation. The slower component most likely reflects irreversible trapping in st...
Starting Page	9159
Ending Page	9168
Page Count	10
File Format	PDF HTM / HTML
DOI	10.1021/acs.jpcc.5b01827
Volume Number	119
Alternate Webpage(s)	https://kops.uni-konstanz.de/bitstream/handle/123456789/31531/Wehrenfennig_290838.pdf?isAllowed=y&sequence=3
Alternate Webpage(s)	https://www-herz.physics.ox.ac.uk/publications/Wehrenfennig15a.pdf
Alternate Webpage(s)	https://doi.org/10.1021/acs.jpcc.5b01827
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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