Regensburg 2007 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 45: ZnO II
HL 45.1: Talk
Thursday, March 29, 2007, 14:00–14:15, H17
Optical Investigation of Surface Defects in ZnO Nanostructures — •Johannes Fallert1, Robert Hauschild1, Huijuan Zhou1, Felix Stelzl1, Markus Wissinger1, Mario Hauser1, Dong Sik Kim2, Margit Zacharias2, Claus Klingshirn1, and Heinz Kalt1 — 1Universität Karlsruhe (TH), Karlsruhe, Germany — 2Max-Planck-Institute of Microstructure Physics, Halle,
The optical properties of different ZnO nanostructures are investigated. Thereby we focus on a photoluminescence (PL) emission band around 3.31 eV. Compared to bulk ZnO this band is observed to be strongly increased in ZnO nanoparticles. We assign the origin of this emission band to acceptors present at the particle surface since this emission band shows a clear dependence on the surface to volume ratio of the particles. Temperature dependent measurements reveal that this band plays a major role up to room temperature. Furthermore, time resolved and intensity dependent measurements have been carried out to confirm this designation and to understand the luminescence dynamics.