Regensburg 2010 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 61: Poster II: Materials, Interfaces and Heterostructures
HL 61.32: Poster
Thursday, March 25, 2010, 18:00–20:00, Poster D1
Photoluminescence studies of top-down Zn1−xMgxO/ZnO quantum disk samples with different dimensions — •Martin Fischer1, Markus Piechotka1, Torsten Henning1, Bernhard Laumer2, Peter Klar1, Martin Eickhoff1, and Bruno Meyer1 — 1I. Physikalisches Institut, Justus Liebig Universität Giessen, Heinrich Buff Ring 16, 35392 Gießen — 2Walter Schottky Institut, Technische Universität München, Am Coulombwall 3, 85748 Garching
Quantum disc structures with diameters of 100 and 200 nm were prepared from PAMBE-grown Zn1−xMgxO/ZnO single quantum well structures of different well widths by using electron beam lithography followed by a combination of wet chemical and ion-beam etching. The samples were studied by photoluminescence spectroscopy. We investigated the influence of strain relaxation in quantum disks of different diameter on the excitonic transitions. We also study the impact of the quantum disc size on the linewidths of the excitonic energies as well as on the emission intensities in the PL spectra. The lateral dimension of the quantum discs allows one to exclude additional lateral quantum confinement effects in the samples.