TITLE

Size-dependent recombination dynamics in ZnO nanowires

AUTHOR(S)
Reparaz, J. S.; Güell, F.; Wagner, M. R.; Hoffmann, A.; Cornet, A.; Morante, J. R.
PUB. DATE
February 2010
SOURCE
Applied Physics Letters;2/1/2010, Vol. 96 Issue 5, p053105
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A deep understanding of the recombination dynamics of ZnO nanowires (NWs) is a natural step for a precise design of on-demand nanostructures based on this material system. In this work we investigate the influence of finite-size on the recombination dynamics of the neutral bound exciton around 3.365 eV for ZnO NWs with different diameters. We demonstrate that the lifetime of this excitonic transition decreases with increasing the surface-to-volume ratio due to a surface induced recombination process. Furthermore, we have observed two broad transitions around 3.341 and 3.314 eV, which were identified as surface states by studying the dependence of their life time and intensitiy with the NWs dimensions.
ACCESSION #
47929115

 

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