Journal
ACS NANO
Volume 4, Issue 8, Pages 4943-4947Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn101366w
Keywords
semiconductor nanowires; nanoscale phase diagrams; semiconductor-metal alloy drops; Au-Ge binary system; vapor-liquid-solid growth
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Funding
- U.S. Department of Energy [DE-AC02-98CH1-886]
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We use in situ observations during high-temperature transmission electron microscopy to quantify the exchange of semiconductor material between Au-Ge vapor-liquid-solid seed drops and Ge nanowires (NWs). By performing simultaneous measurements under identical conditions on arrays with systematic variations in NW diameter, we establish the nanoscale size dependence of the temperature-dependent equilibrium composition of the Au-Ge binary alloy. We find a significantly enhanced Ge solubility for drops on thin NWs compared to thicker ones. The controlled modification of the surface of the NW by an ordered carbon shell leads to drastic changes in the solubility.
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