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摘要
In present study, [110]-oriented cubic phase Mg0.21Zn0.79O/MgO biaxial strained multiple-quantum-well (MQW) nanorods were grown on Al2O3 (10 (1) over bar0) substrates by pulsed laser deposition technique. In spite of the large lattice mismatch between Mg0.21Zn0.79O and MgO layers, coherent epitaxial growths of cubic Mg0.21Zn0.79O /MgO MQWs have been realized in each nanorod structure, which has been confirmed by high resolution transmission electron microscopy and X-ray diffraction spectroscopy. A quasi-Stranski-Krastanov (SK) growth mode was exploited to describe the growth of the MQW nanorods. Experimental and theoretical results demonstrate that in-plane compressive stress not only converts low Mg-content MgZnO alloys in an anomalous rocksalt (RS) phase but also broadens the band gaps of RS-MgZnO/MgO MQWs into the deep-ultraviolet (DUV) range. Our results indicate that RS-MgZnO/MgO MQW structures have potential applications in UV and DUV optoelectronic devices.
