Facile synthesis and growth mechanism of Ni-catalyzed GaAs nanowires on non-crystalline substrates

Ning Han, Fengyun Wang, Alvin T. Hui, Jared J. Hou, Guangcun Shan, Fei Xiu, Takfu Hung, Johnny C. Ho

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)

Abstract

GaAs nanowires (NWs) have been extensively explored for next generation electronics, photonics and photovoltaics due to their direct bandgap and excellent carrier mobility. Typically, these NWs are grown epitaxially on crystalline substrates, which could limit potential applications requiring high growth yield to be printable or transferable on amorphous and flexible substrates. Here, utilizing Ni as a catalytic seed, we successfully demonstrate the synthesis of highly crystalline, stoichiometric and dense GaAs NWs on amorphous SiO2 substrates. Notably, the NWs are found to grow via the vapor-solid-solid (VSS) mechanism with non-spherical NiGa catalytic tips and low defect densities while exhibiting a narrow distribution of diameter (21.0 3.9nm) uniformly along the entire length of the NW (>10νm). The NWs are then configured into field-effect transistors showing impressive electrical characteristics with ION/IOFF > 103, which further demonstrates the purity and crystal quality of NWs obtained with this simple synthesis technique, compared to the conventional MBE or MOCVD grown GaAs NWs.

Original languageEnglish
Article number285607
JournalNanotechnology
Volume22
Issue number28
DOIs
Publication statusPublished - Jul 15 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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