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Nanomaterials 2017, 7(9), 275;

Field Emission from Self-Catalyzed GaAs Nanowires

CNR-SPIN Salerno, via Giovanni Paolo II n.132, I-84084 Fisciano, Italy
Physics Department ‘E. R. Caianiello’, University of Salerno, via Giovanni Paolo II, I-84084 Fisciano, Italy
Department of Physical and Chemical Science, University of L’Aquila, via Vetoio, Coppito, I-67100 L’Aquila, Italy
Optoelectronics Research Centre, Tampere University of Technology, Korkeakoulunkatu 3, FI-33720 Tampere, Finland
Author to whom correspondence should be addressed.
Received: 23 August 2017 / Revised: 12 September 2017 / Accepted: 13 September 2017 / Published: 16 September 2017
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We report observations of field emission from self-catalyzed GaAs nanowires grown on Si (111). The measurements were taken inside a scanning electron microscope chamber with a nano-controlled tungsten tip functioning as anode. Experimental data were analyzed in the framework of the Fowler-Nordheim theory. We demonstrate stable current up to 10−7 A emitted from the tip of single nanowire, with a field enhancement factor β of up to 112 at anode-cathode distance d = 350 nm. A linear dependence of β on the anode-cathode distance was found. We also show that the presence of a Ga catalyst droplet suppresses the emission of current from the nanowire tip. This allowed for the detection of field emission from the nanowire sidewalls, which occurred with a reduced field enhancement factor and stability. This study further extends GaAs technology to vacuum electronics applications. View Full-Text
Keywords: field emission; semiconductor nanowires; gallium arsenide; Fowler-Nordheim theory; field enhancement factor field emission; semiconductor nanowires; gallium arsenide; Fowler-Nordheim theory; field enhancement factor

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Giubileo, F.; Di Bartolomeo, A.; Iemmo, L.; Luongo, G.; Passacantando, M.; Koivusalo, E.; Hakkarainen, T.V.; Guina, M. Field Emission from Self-Catalyzed GaAs Nanowires. Nanomaterials 2017, 7, 275.

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