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HL: Halbleiterphysik

HL 49: Poster II

HL 49.81: Poster

Donnerstag, 27. März 2003, 16:30–19:00, HSZ/P2

Ordered Nano-clusters of the Oxidic Semiconductors ZnO, CdO, and CuO: Fabrication and Characterization — •Andreas Ladenburger¹, Michael Haupt¹, Xinmin Cao¹, Hubert Rauscher², Rolf Sauer¹, and Klaus Thonke¹ — ¹Abt. Halbleiterphysik, Universität Ulm, D-89069 Ulm — ²Abt. Oberflächenchemie und Katalyse, Universität Ulm, D-89069 Ulm

We produce nano-clusters of ZnO, CdO, and Cu_xO by a self-organizing diblock copolymer approach. The solved diblock copolymers form micelles, which are loaded with metal salts, i.e. ZnCl₂, CdCl₂, and CuCl₂. By dipping a substrate into the solution, a monolayer of ordered micelles is created on the surface of the substrate [1]. A subsequent O-plasma process removes the polymers and oxidizes the metal ions. Finally, ordered clusters of ZnO, CdO and Cu_xO are created on the surface. These clusters have diameters of about 10nm, and are 100nm apart from each other.

The nano-particles are investigated by atomic force microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, and photoluminescence spectroscopy.

To improve their optical quality, the clusters are annealed at high temperatures. Furthermore we passivate the clusters by an additional silica layer.

[1] M. Haupt, S. Miller, A. Ladenburger, R. Sauer, K. Thonke, J. P. Spatz, S. Riethmüller, M. Möller, and F. Banhart, J. Appl. Phys. 91, 9 (2002), 6057