Regensburg 2013 – scientific programme
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DS: Fachverband Dünne Schichten
DS 13: Poster Session III: Layer properties: electrical, optical and mechanical properties; Thin film characterization: structure analysis and composition (XRD, TEM; XPS, SIMS, RBS..)
DS 13.5: Poster
Monday, March 11, 2013, 17:00–20:00, Poster B1
Optical and magnetotransport properties of ZnO thin films grown by metalorganic aerosol deposition — •Christoph Meyer, Sebastian Hühn, Markus Jungbauer, Markus Michelmann, and Vasily Moshnyaga — I. Physikalisches Institut, Georg-August-Universität Göttingen
ZnO, a II-IV semiconductor with a wide direct bandgap Eg=3,4 eV and a near UV and blue photoluminescence zone, is a promising material for optoelectronic, spintronic and photovoltaic applications, which due to recent successes in nanoscale science, becomes even more attractive today. Therefore a growth control of ZnO thin layers on commercially available substrates as well as a control of doping with n- and p-type dopants or magnetic transition metals is an absolutely necessary task. In this work the photoluminescence and Raman spectroscopies are used to detect and identify typical impurity- and dopant-related optical transitions in ZnO layers, grown by metalorganic aerosol deposition (MAD). The growth conditions (e.g. temperature, deposition rate or precursor molarity) and the substrates (Al2O3, MgO buffered Al2O3, ZnO) were varied to improve the quality of the layers. Standard sample characterization techniques, e.g. AFM, XRD, SQUID and Hall effect, were used additionally to confirm the quality of the films. XRD reveals c-axis oriented ZnO films on Al2O3(0001) substrates. We observed a room temperature photoluminescence caused by exciton transition at E=3,288 eV as well as phonon replica.