Control of interface abruptness of polar MgZnO/ZnO quantum wells grown by pulsed laser deposition

A strong quantum confined Stark effect (QCSE) was observed in wedge shaped MgZnO/ZnO quantum wells (QWs) grown by pulsed laser deposition. A reduced laser fluence of 1.8   J / cm 2 was used. Reference samples grown at higher standard fluence 2.4   J / cm 2 showed only a negligible QCSE. Using off-ax...

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Bibliographic Details
Published in:Applied physics letters 2010-08, Vol.97 (5), p.052101-052101-3
Main Authors: Brandt, Matthias, Lange, Martin, Stölzel, Marko, Müller, Alexander, Benndorf, Gabriele, Zippel, Jan, Lenzner, Jörg, Lorenz, Michael, Grundmann, Marius
Format: Article
Language:English
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Summary:A strong quantum confined Stark effect (QCSE) was observed in wedge shaped MgZnO/ZnO quantum wells (QWs) grown by pulsed laser deposition. A reduced laser fluence of 1.8   J / cm 2 was used. Reference samples grown at higher standard fluence 2.4   J / cm 2 showed only a negligible QCSE. Using off-axis deposition without substrate rotation, a constant composition of the barriers was maintained while varying the well width in a wedge shaped QW. A redshift of the QW luminescence with increasing QW thickness up to 230 meV below the ZnO emission was found, accompanied by an increase in the exciton lifetime from 0.3 ns up to 4.2   μ s .
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3475402