5 years ago

Molecular Beam Epitaxy of GaN Nanowires on Epitaxial Graphene

Molecular Beam Epitaxy of GaN Nanowires on Epitaxial Graphene
Ziani de Souza Schiaber, Guanhui Gao, Carsten Pfüller, Manfred Ramsteiner, Pierre Corfdir, Lutz Geelhaar, Lauren A. Galves, Oliver Brandt, João Marcelo J. Lopes, Gabriele Calabrese, Bharat Sharma, Achim Trampert, Sergio Fernández-Garrido
We demonstrate an all-epitaxial and scalable growth approach to fabricate single-crystalline GaN nanowires on graphene by plasma-assisted molecular beam epitaxy. As substrate, we explore several types of epitaxial graphene layer structures synthesized on SiC. The different structures differ mainly in their total number of graphene layers. Because graphene is found to be etched under active N exposure, the direct growth of GaN nanowires on graphene is only achieved on multilayer graphene structures. The analysis of the nanowire ensembles prepared on multilayer graphene by Raman spectroscopy and transmission electron microscopy reveals the presence of graphene underneath as well as in between nanowires, as desired for the use of this material as contact layer in nanowire-based devices. The nanowires nucleate preferentially at step edges, are vertical, well aligned, epitaxial, and of comparable structural quality as similar structures fabricated on conventional substrates.

Publisher URL: http://dx.doi.org/10.1021/acs.nanolett.7b01196

DOI: 10.1021/acs.nanolett.7b01196

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