Vapour-liquid-solid growth of ZnO-ZnMgO core-shell nanowires by gold-catalysed molecular beam epitaxy

Nanotechnology
O W KennedyP A Warburton

Abstract

Nanowire heterostructures, combining multiple phases within a single nanowire, modify functional properties and offer a platform for novel device development. Here, ZnO/ZnMgO core-shell nanowires are grown by molecular beam epitaxy. At growth temperatures above 750 °C, Mg diffuses into ZnO making heterostructure growth impossible; at lower shell-growth temperatures (500 °C), the core-shell structure is retained. Even very thin ZnMgO shells show increased intensity photoluminescence (PL) across the ZnO band-gap and a suppression in defect-related PL intensity, relative to plain ZnO nanowires. EDX measurements on shell thickness show a correlation between shell thickness and core diameter which is explained by a simple growth model.

References

Nov 8, 2002·Nature·Lincoln J LauhonCharles M Lieber
Jul 30, 2008·Nanotechnology·J-P RichtersM Zacharias
Jan 8, 2019·The Journal of Physical Chemistry Letters·Oscar W KennedyMilo S P Shaffer

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Citations

Dec 12, 2019·Nanotechnology·Oscar W KennedyPaul A Warburton

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