Abstract
In present study, [110]-oriented cubic phase Mg0.21Zn0.79O/MgO biaxial strained multiple-quantum-well (MQW) nanorods were grown on Al2O3 (101¯0) 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.
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