Berlin 2012 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 43: Poster Session: Quantum Dots and Wires - Preparation and Characterization / Devices (incl. Laser) / Ultrafast Phenomena

HL 43.7: Poster

Dienstag, 27. März 2012, 09:30–12:30, Poster D

Elemental and Structural Analysis of Nanowires in Cross-Sectional Specimens — •Benedikt Bauer, Johannes Bill, Marcello Soda, Andreas Rudolph, Elisabeth Reiger, and Josef Zweck — Universität Regensburg, Regensburg, Germany

To use nanowires (NWs) as building blocks for future electronics, functionalization is needed. One way to achieve this is the growth of radial heterostructures, also known as core-shell approach.

To access core and shell(s) of core-shell NWs separately for structural and compositional analysis in transmission electron microscopy (TEM) the NWs must be cut perpendicular to their axis into ≲ 100 nm thick slices to allow for an investigation in cross-section. For this we use ultramicrotomy as a fast and gentle method which has some advantages over other thin film preparation methods: In contrary to embedding and grinding it is possible to cut several tens of sample slices from one specimen block which also allows to access different regions along the NW axis and therefore different stages of the growth process. Compared to focused ion beam cutting the preparation induced crystal damage and surface amorphization is rather low.

The technique was used on GaAs/(Ga:Mn)As core-shell NWs as well as on GaAs/AlGaAs mutli-core-shell NWs grown in molecular beam epitaxy (MBE). We present high resolution TEM images and energy dispersive X-ray (EDX) analysis results to illustrate the potential of this preparation method.