Structure and optical properties of cored wurtzite (Zn,Mg)O heteroepitaxial nanowires

被引:24
作者
Heo, YW
Abernathy, C
Pruessner, K
Sigmund, W
Norton, DP
Overberg, M
Ren, F
Chisholm, MF
机构
[1] Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32606 USA
[2] Sandia Natl Labs, Albuquerque, NM 87185 USA
[3] Univ Florida, Dept Chem Engn, Gainesville, FL 32606 USA
[4] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
基金
美国国家科学基金会;
关键词
D O I
10.1063/1.1774257
中图分类号
O59 [应用物理学];
学科分类号
摘要
The synthesis, structure, and optical properties of one-dimensional heteroepitaxial cored (Zn,Mg)O semiconductor nanowires grown by a catalyst-driven molecular beam epitaxy technique are discussed. The structures form spontaneously in a Zn, Mg and O-2/O-3 flux, consisting of a single crystal, Zn-rich Zn1-xMgxO(x<0.02) core encased by an epitaxial Zn1-yMgyO(y>0.02) sheath. High resolution Z-contrast scanning transmission electron microscopy shows core diameters as small as 4 nm. The cored structure forms spontaneously under constant flux due to a bimodal growth mechanism in which the core forms via bulk like vapor-liquid-solid growth, while the outer sheath grows as a heteroepitaxial layer. Temperature-dependent photoluminescence shows a slight blueshift in the near band edge peak, which is attributed to a few percent Mg doping in the nanoscale ZnO core. The catalyst-driven molecular beam epitaxy technique provides for site-specific nanorod growth on arbitrary substrates. (C) 2004 American Institute of Physics.
引用
收藏
页码:3424 / 3428
页数:5
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