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HL: Fachverband Halbleiterphysik

HL 45: ZnO II

HL 45.1: Vortrag

Donnerstag, 29. März 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.