In-situ observations of nanoscale effects in germanium nanowire growth with ternary eutectic alloys

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Biswas, Subhajit
O'Regan, Colm
Morris, Michael A.
Holmes, Justin D.
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Vapour-liquid-solid (VLS) techniques are popular routes for the scalable synthesis of semiconductor nanowires. In this article, in-situ electron microscopy is used to correlate the equilibrium content of ternary (Au0.75Ag0.25–Ge and Au0.65Ag0.35–Ge) metastable alloys with the kinetics, thermodynamics and diameter of Ge nanowires grown via a VLS mechanism. The shape and geometry of the heterogeneous interfaces between the liquid eutectic and solid Ge nanowires varies as a function of nanowire diameter and eutectic alloy composition. The behaviour of the faceted heterogeneous liquid–solid interface correlates with the growth kinetics of the nanowires, where the main growth facet at the solid nanowire–liquid catalyst drop contact line lengthens for faster nanowire growth kinetics. Pronounced diameter dependent growth kinetics, as inferred from liquid–solid interfacial behaviour, is apparent for the synthesised nanowires. Direct in-situ microscopy observations facilitates the comparison between the nanowire growth behaviour from ternary (Au–Ag–Ge) and binary (Au–Ge) eutectic systems.
Alloys , Eutectics , Germanium , Germanium alloys , Growth kinetics , Kinetics , Liquids , Nanowires , Silver , Silver alloys , Thermodynamics , Heterogeneous interfaces , In-situ electron microscopy , In-situ microscopies , In-situ observations , Liquid-solid interfaces , Nanowire growth kinetics , Semiconductor nanowire , Ternary eutectic alloys , Phase interfaces , VLS , TEM
BISWAS, S., O'REGAN, C., MORRIS, M. A. & HOLMES, J. D. 2015. In-situ Observations of Nanoscale Effects in Germanium Nanowire Growth with Ternary Eutectic Alloys. Small, 11, 103-111.
© 2014 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the accepted version of the following article: Biswas, S., O'Regan, C., Morris, M. A. and Holmes, J. D. (2015), In-situ Observations of Nanoscale Effects in Germanium Nanowire Growth with Ternary Eutectic Alloys. Small, 11: 103–111. doi:10.1002/smll.201401240, which has been published in final form at