Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 42: Nanostructures at surfaces I
O 42.1: Vortrag
Mittwoch, 28. März 2012, 10:30–10:45, MA 042
Synthesize and characterization of the properties of intrinsic defects in size-controlled surface ZnO nanowires by multiple spectroscopic techniques — •Kin Mun Wong1,2, Yaoguo Fang1,2, André Devaux3, Liaoyong Wen1,2, Luisa De Cola3, and Yong Lei1,2 — 1Fachgebiet 3D-Nanostrukturierung, Institut für Physik & Zentrum für Mikro- und Nanotechnologien (ZIK MacroNano), Technische Universität Ilmenau, 98693 Ilmenau, Germany. — 2Institut für Materialphysik, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany. — 3Physikalisches Institut, Westfälische Wilhelms-Universität, 48149 Münster, Germany.
Arrays of regular and size-controlled ZnO nanowires with different length and diameter were synthesized by chemical vapour deposition and hydrothermal method. Quantitative information about the concentration of intrinsic defects such as oxygen vacancies and zinc interstitials as well as their luminescence lifetimes was obtained by a number of different spectroscopic techniques. From the correlation between the different sets of experimental data, some important relationships were observed between the concentration and spatial distribution of the intrinsic defects with regards to the size and surface to volume ratio of the ZnO nanowires. This connection between the defects and the size of the nanowires is essential for the fine tuning and optimatization of the defect related properties in ZnO nanowires. Furthermore, an analytical formula was derived for obtaining the donor concentration in the ZnO nanowires directly from the conductive atomic force microscopy measurements without prior need of depositing a metal electrode layer.