Study of iron-catalysed growth of β-Ga2O3nanowires and their detailed characterization using TEM, Raman and cathodoluminescence techniques

Sudheer Kumar, G. Sarau, C. Tessarek, Muhammad Y. Bashouti, A. Hähnel, S. Christiansen, R. Singh

Research output: Contribution to journalArticlepeer-review

76 Scopus citations

Abstract

In this paper, we demonstrate a new catalyst (Fe) to grow single crystalline beta-gallium oxide (β-Ga2O3) nanowires (NWs) via the vapour-liquid-solid mechanism using the chemical vapour deposition technique. The structural studies of these NWs showed the highly crystalline monoclinic phase of Ga2O3. This was confirmed by detailed scanning transmission electron microscope investigations demonstrating the NW to be single crystalline β-Ga2O3, growing along the normal of the (1 1 1) plane. We also compared Raman and cathodoluminescence (CL) properties of the as-grown β-Ga2O3NWs with a bulk Ga2O3single crystal grown by the Czochralski method. It was observed that Raman peak positions of a single β-Ga2O3NW had a red frequency shift of about 0.3-1.4 cm-1as compared to a bulk Ga2O3single crystal, which was in fact quite small. In addition, the CL measurements of β-Ga2O3NWs and the bulk Ga2O3single crystal exhibited similar spectra, having a strong broad UV-blue emission band and a weak red emission band. Moreover, the structural, morphological and optical properties of Fe-catalysed β-Ga2O3NWs were comparable to those of Au-catalysed β-Ga2O3NWs.

Original languageEnglish
Article number435101
JournalJournal Physics D: Applied Physics
Volume47
Issue number43
DOIs
StatePublished - 29 Oct 2014
Externally publishedYes

Keywords

  • Raman spectra
  • cathodoluminescence
  • chemical vapour deposition
  • gallium oxide nanowires
  • scanning transmission electron microscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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