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SYNW: Nano Wires

SYNW 2: Symposium: Nano-Wires II

SYNW 2.2: Hauptvortrag

Mittwoch, 29. März 2006, 16:30–17:00, HSZ 04

ZnO nanowires and naowire arrays: controlled growth and microscopic characterizations — •Hongjin Fan — Max Planck Institute of Microstructure Physics, 06120 Halle, Germany

Semiconductor nanowires (NW) are promising building blocks for nanoscale electronic and optical devices. For this, controlled synthesis and microscopic characterization of the physical properties of the NW are in the center of current research. In this talk the growth of ZnO NW and NW arrays will be presented. The successful fabrication of periodically arranged ZnO NW is achieved by combining substrate patterning and the catalyst-directed vapor-liquid-solid growth. Various kinds of templating methods have been used including metal nanotube membranes and self-assembled nanosphere mask. We demonstrate the control of position, diameter, length, and orientations of the NW.

The single-crystallinity and epitaxial growth of ZnO NW arrays are verified by cross sectional TEM analysis. Microscopic characterization of individual NW are undertaken using micro-PL spectroscopy to assess the optical quality and study stimulated emissions, scanning cathodoluminescence to identify spatial origin of luminescence and bending effect, and pieozoresponse force microscopy to measure the effective piezoelectric coefficient. In addition, we will show the in-situ manipulation of the NW using SEM-based nanotips.