Abstract
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.
Highlights
The quest for novel semiconductor materials with improved optoelectronic performance has triggered intense research activities to exploit the great diversity of effects offered by low dimensional systems
Besides the many well known effects originating from quantum confinement, geometrical aspects such as the large surfaceto-volume ratio of low dimensional structures have great influence on the dynamics of the charge carriers
We demonstrate that the recombination dynamics of excitons in ZnO nanowires can be well understood within the concept of optical nanocavities
Summary
The quest for novel semiconductor materials with improved optoelectronic performance has triggered intense research activities to exploit the great diversity of effects offered by low dimensional systems. Spatial mapping of exciton lifetimes in single ZnO nanowires Spain (Received 2 March 2013; accepted 10 April 2013; published online 7 June 2013)
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