%0 Journal Article
%T Spatial mapping of exciton lifetimes in single ZnO nanowires
%A J. S. Reparaz
%A G. Callsen
%A M. R. Wagner
%A F. G¨šell
%J APL Materials
%D 2013
%I AIP Publishing LLC
%R 10.1063/1.4808441
%X We investigate the spatial dependence of the exciton lifetimes in single ZnO nanowires. We have found that the free exciton and bound exciton lifetimes exhibit a maximum at the center of nanowires, while they decrease by 30% towards the tips. This dependence is explained by considering the cavity-like properties of the nanowires in combination with the Purcell effect. We show that the lifetime of the bound-excitons scales with the localization energy to the power of 3/2, which validates the model of Rashba and Gurgenishvili at the nanoscale.
%U http://link.aip.org/link/doi/10.1063/1.4808441