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Phase separation induced by Au catalysts in ternary InGaAs nanowires.

Guo, YN and Xu, HY and Auchterlonie, GJ and Burgess, T and Joyce, HJ and Gao, Q and Tan, HH and Jagadish, C and Shu, HB and Chen, XS and Lu, W and Kim, Y and Zou, J (2013) Phase separation induced by Au catalysts in ternary InGaAs nanowires. Nano Lett, 13. pp. 643-650.

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Abstract

We report a novel phase separation phenomenon observed in the growth of ternary In(x)Ga(1-x)As nanowires by metalorganic chemical vapor deposition. A spontaneous formation of core-shell nanowires is investigated by cross-sectional transmission electron microscopy, revealing the compositional complexity within the ternary nanowires. It has been found that for In(x)Ga(1-x)As nanowires high precursor flow rates generate ternary In(x)Ga(1-x)As cores with In-rich shells, while low precursor flow rates produce binary GaAs cores with ternary In(x)Ga(1-x)As shells. First-principle calculations combined with thermodynamic considerations suggest that this phenomenon is due to competitive alloying of different group-III elements with Au catalysts, and variations in elemental concentrations of group-III materials in the catalyst under different precursor flow rates. This study shows that precursor flow rates are critical factors for manipulating Au catalysts to produce nanowires of desired composition.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Electronics, Power & Energy Conversion
Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:25
Last Modified: 26 Mar 2014 19:19
DOI: 10.1021/nl304237b

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