Microstructural characterization of GaAs-Al xGa 1-xAs core-shell nanowires grown by Au-catalyst assisted MOVPE

D. Altamura, I. Miccoli, P. Prete, N. Lovergine, L. Tapfer

Research output: Contribution to conferencePaper

Abstract

In this work, we report on the microstructural and morphological characterization of III-V semiconductor nanowires (NWs) epitaxially grown on (111)B-GaAs substrates by Au-catalyst assisted metalorganic vapor phase epitaxy. As-grown dense (108-109cm-2) arrays of few-micron long vertically-aligned (i.e. parallel to the 〈111〉 crystallographic axis) GaAs, AlxGa1-xAs and core-shell GaAs-AlxGa1-xAs NWs were investigated, carrying out HRXRD measurements on different (hkl) reflections and by recording reciprocal space maps (RSMs) around the materials (111) reciprocal lattice points (relps). We show that NW diffraction peaks are visible in the RSM by means of characteristic halos. In the case of GaAs NWs, the halo is located at the (111) relp indicating that the NWs are grown along the 〈111〉 direction and parallel to the 〈111〉 axis of the GaAs substrate. On the contrary, for AlxGa1-xAs NWs or intentional core-shell GaAs-AlxGa1-xAs NWs the halo is displaced (along the momentum transfer normal to the surface, Qz) with respect to the GaAs (111) relp due to the elastic lattice strain associated with the compositional variation, e.g. the Al molar fraction in the AlxGa1-xAs alloy, within the nanostructures. © 2011 Materials Research Society.
Original languageEnglish
DOIs
Publication statusPublished - 2011
Externally publishedYes
Event2011 MRS Spring Meeting - , United States
Duration: 1 Jan 2011 → …

Conference

Conference2011 MRS Spring Meeting
CountryUnited States
Period1/1/11 → …

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Altamura, D., Miccoli, I., Prete, P., Lovergine, N., & Tapfer, L. (2011). Microstructural characterization of GaAs-Al xGa 1-xAs core-shell nanowires grown by Au-catalyst assisted MOVPE. Paper presented at 2011 MRS Spring Meeting, United States. https://doi.org/10.1557/opl.2011.871