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HL: Fachverband Halbleiterphysik

HL 51: Poster IV

HL 51.62: Poster

Donnerstag, 28. Februar 2008, 16:30–19:00, Poster D

Comparison of the crystalline and optical properties of VLS- and VS-grown ZnO nanopillars — •Anton Reiser, Vahid Raeesi, Dalia Omar Zayan, Günther M. Prinz, Martin Schirra, Martin Feneberg, Klaus Thonke, and Rolf Sauer — Institut für Halbleiterphysik, Universität Ulm, D-89069 Ulm

Zinc oxide (ZnO) nanostructures were grown by two different methods, and their crystalline and luminescence properties are compared. In one series of experiments the vapor-liquid-solid (VLS) carbo-thermal mechanism was used to grow ZnO nanowires with gold particles acting as catalyst. In another series, a uniform basic zinc acetate (BZA)/ZnO nanocrystalline seed-layer was used as a template for the vapor-solid (VS) growth of the ZnO nanowires. In the first case, we observe real VLS and VLS-initiated growth of well-aligned ZnO nanowire arrays, where real VLS growth is defined by Zn-Au alloy droplets sitting directly on top of the wires. The related photoluminescence (PL) spectra show near-band edge features as typical for bulk ZnO. Line widths of below 0.7 meV for the donor-bound exciton transitions stand for good crystal quality. In the second case, we also observe well-aligned ZnO nanowire arrays, however with line widths down to 250 µeV.