Abstract We report on the Au-assisted vapour-liquid-solid (VLS) growth of GaAs/InxGa1-xAs/GaAs (0.2 ≤ x ≤ 1) axial double-heterostructure nanowires on GaAs (111) B substrates via metal-organic chemical vapor deposition (MOCVD) technique. The influence of indium content in Au particle on the morphology of nanowires is investigated systematically. A short period of pre-introduced indium precursor before the growth of InxGa1-xAs segment, coupled with a group III precursor interruption, is conducive to obtaining symmetrical heterointerfaces as well as the desired In/Ga ratio in the InxGa1-xAs section. The nanowire morphology, such as kinking and tapering, are thought to be related to the In composition in the catalyst alloy as well as the VLS growth mechanism.
(Structure of nanowires and nanorods (long, free or loosely attached, quantum wires and quantum rods, but not gate-isolated embedded quantum wires))
Fund: Project supported by the National Basic Research Program of China (Grant No. 2010CB327600), the National Natural Science Foundation of China (Grant Nos. 61020106007 and 61077049), the International Science & Technology Cooperation Program of China (Grant No. 2011DFR11010), the Specialized Research Fund for the Doctoral Program of Higher Education (Grant No. 20120005110011), and the 111 Program of China (Grant No. B07005).
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