Influence of indium and phosphine on Au-catalyzed InP nanowire growth on Si substrates

被引:19
|
作者
Boles, Steven T. [1 ]
Thompson, Carl V. [1 ]
Fitzgerald, Eugene A. [1 ]
机构
[1] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA
基金
美国国家科学基金会;
关键词
Nanostructures; Metalorganic chemical vapor deposition; Phosphides; Semiconducting III-V materials; MOLECULAR-BEAM EPITAXY; SILICON; PRELAYERS; GAP; PH3;
D O I
10.1016/j.jcrysgro.2008.12.043
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
The growth of InP nanowires by the VLS mechanism on Si <1 1 1> substrates with varying pre-growth treatments was investigated. When Au-catalyst particles were treated with trimethylindium before growth there was an increase in the fraction of catalyst particles yielding wire growth and in the number of these wires growing vertically from the substrate. This was confirmed using scanning electron microscopy, X-ray diffraction and energy dispersive X-ray spectroscopy. Cross-sectional transmission electron microscopy revealed that Au-catalyst particles exposed to PH(3) before growth did not alloy with the underlying Si substrate. InP wires were also grown using Ag catalyst particles which do not alloy with the Si substrate. However, wire growth does not appear to be inhibited in this case. These results suggest that P is the primary cause for the both lack of growth from some catalyst particles and growth in directions other than the vertical <1 1 1> direction of the substrate. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:1446 / 1450
页数:5
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