Anisotropic strained cubic MgZnO/MgO multiple-quantum-well nanorods: Growths and optical properties
Anisotropic strained cubic MgZnO/MgO multiple-quantum-well nanorods: Growths and optical properties
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DOI：
10.1063/1.4788685
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发表时间：
2013-01
影响因子：
4
通讯作者：
Lei Wang;Jiangang Ma;Haiyang Xu;Ceng Zhang;Xinghua Li;Yichun Liu
中科院分区：
文献类型：
--
作者：
Lei Wang;Jiangang Ma;Haiyang Xu;Ceng Zhang;Xinghua Li;Yichun Liu
采用脉冲激光沉积技术在Al 2 O3（101 <$0）衬底上生长了[110]取向的立方相Mg 0. 21 Zn 0. 79 O/MgO双轴应变多量子阱（MQW）纳米棒。尽管Mg0.21Zn0.79O和MgO层之间存在较大的晶格失配，但在每个纳米棒结构中均实现了立方Mg0.21Zn0.79O /MgO多量子阱的相干外延生长，这已被高分辨率透射电子显微镜和X射线衍射光谱所证实。利用准Stranski-Krastanov（SK）生长模式来描述MQW纳米棒的生长。实验和理论结果表明，面内压应力不仅转换在一个异常的岩盐（RS）相的低镁含量的MgZnO合金，但也扩大了RS-MgZnO/MgO多量子阱的带隙到深紫外（DUV）范围。研究结果表明，RS-MgZnO/MgO多量子阱结构在紫外和深紫外光电子器件中具有潜在的应用前景。
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.