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III–V semiconductor nanowires hold outstanding potential as key component for future photonic and electronic devices, among which GaAs/AlGaAs heterostructure nanowires wires show particular promise. However, due to the large surface-to-volume ratio, the carrier lifetime and mobility of GaAs nanowires are extremely sensitive to the surface/interface states. Although nearly intrinsic exciton lifetimes...
To explore the growth mechanism and the effect of non-gold catalysts in growing III–V epitaxial nanowires, InAs nanowires were grown on GaAs(111)B substrates using annealed Pd thin film as catalyst. Through detailed scanning and transmission electron microscopy (SEM/TEM) characterisations, it is found that when the catalyst size is less than 50 nm (from annealing the Pd thin film), defect-free zinc-blende...
InxGa1−xAs nanowires were grown using metal-organic chemical vapour deposition (MOCVD) with various growth temperatures and V/III ratios. The morphology of these nanowires and the composition distribution along the nanowire were studied as a function of these growth parameters. With higher growth temperature and lower V/III ratio, the tapering of the nanowires is reduced. However, the incorporation...
The zinc dopant concentration and distribution in GaAs nanowires is quantified by atom probe tomography. Material deposited radially by a vapour-solid process is shown to have a significantly higher dopant concentration in comparison to the core which grows by the vapour-liquid-solid process. Zinc concentrations of up to 7×1019 and 5×1020 atoms/cm3 are measured for core and shell materials respectively...
GaAs/AlxGa1−xAs core-shell nanowires were grown by metal organic chemical vapour deposition with Au-catalysed GaAs cores. Cross-section transmission electron microscope bright field images show that the tapering at bottom of the nanowires is mainly caused by GaAs cap growth. Time-resolved photo-luminescence measurements of single nanowires were taken at room temperature and a minority carrier lifetime...
We review GaAs nanowires and related nanowire heterostructures grown on Si (111) substrates by metal organic chemical vapor deposition via vapor-liquid-solid (VLS) mechanism. Transmission electron microscopy, micro-photoluminescence and micro-Raman spectroscopy have been used to understand the crystal structure, light emission and strain effects on the bandgap energy of GaAs nanowires.
We review various III–V compound semiconductor nanowires grown by metalorganic chemical vapor deposition. Transmission and scanning electron microscopy, micro-photolumine-scence and micro-Raman spectroscopy have been used to understand the crystal structure, light emission and band structure.
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