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Recombination dynamics in ZnO nanowires: Surfaces states versus mode quality factor

Reparaz, Juan Sebastián; Güell, Frank; Wagner, Markus R.; Callsen, Gordon; Kirste, Ronny; Claramunt, Sergi; Morante, Juan Ramon; Hoffmann, Axel

FG Optische Charakterisierung von Halbleitern

In this work, we investigate the influence of finite size on the recombinations dynamics of ZnO nanowires. We demonstrate that diameter as well as length of nanowires determine the lifetime of the neutral donor bound excitons. Our findings suggest that while the length is mainly responsible for different mode quality factors of the cavity-like nanowires, the diameter determines the influence of surface states as alternative recombinations channels for the optical modes trapped in the nanocavity. In addition, comparing nanowires grown using different catalyst we show that the surfaces states strongly depend on each precursor characteristics.
  • This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Appl. Phys. Lett. 97, 133116 (2010) and may be found at https://doi.org/10.1063/1.3496444.