We investigate the metallic phases observed in hybrid metal-GaAs nanowire devices obtained by controlled thermal annealing of Ni/Au electrodes. Devices are fabricated onto a SiN membrane compatible with transmission electron microscopy studies. Energy dispersive X-ray spectroscopy allows us to show that the nanowire body includes two Ni-rich phases that thanks to an innovative use of electron diffraction tomography can be unambiguously identified as Ni3GaAs and Ni5As2 crystals. The mechanisms of Ni incorporation leading to the observed phenomenology are discussed.

Crystal Phases in Hybrid Metal-Semiconductor Nanowire Devices / David, J; Rossella, Francesco; Rocci, Mirko; Ercolani, Daniele; Sorba, Lucia; Beltram, Fabio; Gemmi, M; Roddaro, Stefano. - In: NANO LETTERS. - ISSN 1530-6984. - 17:4(2017), pp. 2336-2341. [10.1021/acs.nanolett.6b05223]

Crystal Phases in Hybrid Metal-Semiconductor Nanowire Devices

ROSSELLA, FRANCESCO;ERCOLANI, Daniele;SORBA, LUCIA;
2017

Abstract

We investigate the metallic phases observed in hybrid metal-GaAs nanowire devices obtained by controlled thermal annealing of Ni/Au electrodes. Devices are fabricated onto a SiN membrane compatible with transmission electron microscopy studies. Energy dispersive X-ray spectroscopy allows us to show that the nanowire body includes two Ni-rich phases that thanks to an innovative use of electron diffraction tomography can be unambiguously identified as Ni3GaAs and Ni5As2 crystals. The mechanisms of Ni incorporation leading to the observed phenomenology are discussed.
2017
17
4
2336
2341
Crystal Phases in Hybrid Metal-Semiconductor Nanowire Devices / David, J; Rossella, Francesco; Rocci, Mirko; Ercolani, Daniele; Sorba, Lucia; Beltram, Fabio; Gemmi, M; Roddaro, Stefano. - In: NANO LETTERS. - ISSN 1530-6984. - 17:4(2017), pp. 2336-2341. [10.1021/acs.nanolett.6b05223]
David, J; Rossella, Francesco; Rocci, Mirko; Ercolani, Daniele; Sorba, Lucia; Beltram, Fabio; Gemmi, M; Roddaro, Stefano
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1247614
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