Dresden 2011 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 44: Poster Session I
HL 44.87: Poster
Tuesday, March 15, 2011, 18:00–21:00, P3
Photoluminescence studies of top-down Zn1−xMgxO/ZnO quantum square samples with different dimensions — •Martin Fischer1, Markus Piechotka1, Torsten Henning1, Alexej Chernikov3, Bernhard Laumer2, Sangam Chatterjee3, Peter J. Klar1, Martin Eickhoff1, and Bruno K. 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 — 3Fachbereich Physik, Philipps-Universität Marburg, Renthof 5, 35032 Marburg
Quantum square structures with lateral lengths from 100 nm to 4 µm were prepared from PAMBE-grown Zn1−xMgxO/ZnO single quantum well samples with 10 nm well width and a Mg content of 0.16 by using electron beam lithography followed by ion-beam etching. Low temperature photoluminescence spectroscopy studies were done on groups of several squares. We also investigated single squares in time-dependent photoluminescence spectroscopy. We report the influence of strain relaxation in quantum squares of different dimensions on the excitonic transitions. The lateral dimension of the quantum squares allows one to exclude additional lateral quantum confinement effects in the samples.