Regensburg 2007 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 46: Poster 2
HL 46.45: Poster
Thursday, March 29, 2007, 15:00–17:30, Poster A
Synthesis and optical properties of ordered ZnO nanostructures — •Markus Wissinger1, Huijuan Zhou1, Johannes Fallert1, Felix Stelzl1, Daniel Weissenberger2, Mario Hauser1, Robert Hausschild1, Dagmar Gerthsen2, Claus Klingshirn1, and Heinz Kalt1 — 1Institut für angewandte Physik, Universität Karlsruhe (TH), Karlsruhe, Germany — 2Laboratorium für Elektronenmikroskopie, Universität Karlsruhe (TH), Karlsruhe, Germany
In this work we present the controlled growth of ordered ZnO nanostructures by a vapor phase transportation method in a horizontal tube furnace. The ordered ZnO nanostructures are grown using pre-structured gold catalyst patterns, which are produced by electron beam lithography as well as by gold evaporation through a mask of self organized polystyrene balls. The growth is conducted at different temperatures (from 500 to 800 ∘C) under a constant pressure of several hundred mbar and a constant N2 flow.
The morphology of the ZnO nanostructures is found to be very sensitive to the substrate material and growth parameters. A GaN substrate appears to be more suitable for perpendicular growth of ⟨ 0001 ⟩ ZnO than Si or Sapphire. Low temperature photoluminescence measurements show predominant emission in the UV region of the spectra, indicating high sample quality. Typically three donor bound excitons, I4 , I5/6 , I9 and the A-free exciton are observed. The corresponding donors are assumed to be hydrogen, aluminum, and indium, respectively.