Observation of persistent photoconductance in single ZnO nanotube
- 9 February 2009
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 94 (6), 063120
- https://doi.org/10.1063/1.3082173
Abstract
Vertically aligned ZnO nanotube fabricated on an indium tin oxide substrate is found to exhibit strong persistent photoconductivity (PPC). Excitation wavelength-dependent conductance measurement on individual ZnO nanotube reveals the presence of defect states at 240 meV above the valence band edge, which are directly associated with the PPC effect. Our observations are consistent with the hypothesis that double ionization of defect-localized states is responsible for the PPC effect.Keywords
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