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HL: Fachverband Halbleiterphysik

HL 38: Zinc Oxide

HL 38.5: Vortrag

Dienstag, 21. März 2017, 10:45–11:00, POT 06

Second-Harmonic Generation in ZnO/(Zn,Mg)O Multiple Quantum Wells — •Johannes Mund¹, Dmitri R. Yakovlev¹, Sergey Sadofev², Cedrik Meier³, and Manfred Bayer¹ — ¹Experimentelle Physik 2, Technische Universität Dortmund, Germany — ²Institut für Physik, AG Photonik, Humboldt-Universität zu Berlin, Germany — ³Department Physik, Nanophotonik & Nanomaterialien, Universität Paderborn, Germany

Non-linear optical properties of ZnO/Zn_0.9Mg_0.1O multiple quantum wells with well width varied from 1.8 to 10 nm are studied by second-harmonic generation (SHG).

We succeed to detect the 1S quantum well exciton and show qualitatively the quantum confinement of this state in narrow QW as well as the quantum confined stark effect in broader QW. A comparison to spectra of ZnO bulk material and a pure ZnMgO layer confirms that the observed resonance has its origin in the MQW structure. SHG spectra are compared with photoluminescence and reflectivity spectra to identify exciton transitions. Also SHG rotational diagrams are measured and relative values of components of the non-linear susceptibility tensor are evaluated.