In situ analysis of catalyst composition during gold catalyzed GaAs nanowire growth

Carina B. Maliakkal (), Daniel Jacobsson, Marcus Tornberg, Axel R. Persson, Jonas Johansson, Reine Wallenberg and Kimberly A. Dick
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Carina B. Maliakkal: NanoLund, Lund University
Daniel Jacobsson: NanoLund, Lund University
Marcus Tornberg: NanoLund, Lund University
Axel R. Persson: NanoLund, Lund University
Jonas Johansson: NanoLund, Lund University
Reine Wallenberg: NanoLund, Lund University
Kimberly A. Dick: NanoLund, Lund University

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract Semiconductor nanowires offer the opportunity to incorporate novel structures and functionality into electronic and optoelectronic devices. A clear understanding of the nanowire growth mechanism is essential for well-controlled growth of structures with desired properties, but the understanding is currently limited by a lack of empirical measurements of important parameters during growth, such as catalyst particle composition. However, this is difficult to accurately determine by investigating post-growth. We report direct in situ measurement of the catalyst composition during nanowire growth for the first time. We study Au-seeded GaAs nanowires inside an electron microscope as they grow and measure the catalyst composition using X-ray energy dispersive spectroscopy. The Ga content in the catalyst during growth increases with both temperature and Ga precursor flux.

Date: 2019
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DOI: 10.1038/s41467-019-12437-6

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