Molecular Beam Epitaxy of GaN Nanowires on Epitaxial Graphene

作者：Fernandez Garrido Sergio^*; Ramsteiner Manfred; Gao Guanhui; Galves Lauren A; Sharma Bharat; Corfdir Pierre; Calabrese Gabriele; Schiaber Ziani de Souza; Pfueller Carsten; Trampert Achim; Lopes Joao Marcelo J; Brandt Oliver; Geelhaar Lutz

来源：Nano Letters, 2017, 17(9): 5213-5221.

DOI：10.1021/acs.nanolett.7b01196

• Single-layer graphene
• bilayer graphene
• multilayer graphene
• nanocolumn
• nanorod
• III-V compound semiconductors
• nitrides
• growth

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 nano-wire 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 nucleate preferentially at step edges, are vertical, well aligned, epitaxial, and of comparable structural quality as similar structures fabricated on conventional substrates.

• 出版日期2017-9
• 单位Univ Estadual Paulista