Diffusion-driven growth of nanowires by low-temperature molecular beam epitaxy

With ZnTe as an example, we use two different methods to unravel the characteristics of the growth of nanowires (NWs) by gold-catalyzed molecular beam epitaxy at low temperature. In the first approach, CdTe insertions have been used as markers, and the nanowires have been characterized by scanning t...

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Bibliographic Details
Published in:Journal of applied physics 2016-04, Vol.119 (16)
Main Authors: Rueda-Fonseca, P., Orrù, M., Bellet-Amalric, E., Robin, E., Den Hertog, M., Genuist, Y., André, R., Tatarenko, S., Cibert, J.
Format: Article
Language:English
Subjects:
Applied physics
CADMIUM TELLURIDES
CATALYSTS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Condensed Matter
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DIFFUSION
DIFFUSION LENGTH
ELECTRON SCANNING
Energy transmission
Epitaxial growth
GOLD
Low temperature
Mathematical analysis
MOLECULAR BEAM EPITAXY
MOLECULAR BEAMS
NANOWIRES
PHASE STUDIES
Physics
SCANNING ELECTRON MICROSCOPY
Scanning transmission electron microscopy
SPECTROSCOPY
STATISTICS
STOICHIOMETRY
SUBSTRATES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
TRANSMISSION ELECTRON MICROSCOPY
ZINC TELLURIDES
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Summary:With ZnTe as an example, we use two different methods to unravel the characteristics of the growth of nanowires (NWs) by gold-catalyzed molecular beam epitaxy at low temperature. In the first approach, CdTe insertions have been used as markers, and the nanowires have been characterized by scanning transmission electron microscopy, including geometrical phase analysis and energy dispersive electron spectrometry; the second approach uses scanning electron microscopy and the statistics of the relationship between the length of the tapered nanowires and their base diameter. Axial and radial growth are quantified using a diffusion-limited model adapted to the growth conditions; analytical expressions describe well the relationship between the NW length and the total molecular flux (taking into account the orientation of the effusion cells), and the catalyst-nanowire contact area. A long incubation time is observed. This analysis allows us to assess the evolution of the diffusion lengths on the substrate and along the nanowire sidewalls, as a function of temperature and deviation from stoichiometric flux.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4947269