Compressively-strained GaSb nanowires with core-shell heterostructures

Research output: Contribution to journalArticle

Abstract

GaSb-based nanowires in a gate-all-around geometry are good candidates for binary p-type transistors, however they require the introduction of compressive strain to enhance the transport properties. Here, we for the first time demonstrate epitaxial GaSb-GaAsxSb1−x core-shell nanowires with a compressively strained core. Both axial and hydrostatic strain in GaSb core have been measured by X-ray diffraction (XRD) and Raman scattering, respectively. The optimal sample, almost without plastic relaxation, has an axial strain of −0.88% and a hydrostatic strain of −1.46%, leading to a noticeable effect where the light hole band is calculated to be 33.4 meV above the heavy hole band at the Γ-point. This valence band feature offers more light holes to contribute the transport process, and thus may provide enhanced hole mobility by reducing both the interband scattering and the hole effective mass. Our results show that lattice-mismatched epitaxial core-shell heterostructures of high quality can also be realized in the promising yet demanding GaSb-based system. [Figure not available: see fulltext.].

Details

Authors
Organisations
External organisations
  • University of Edinburgh
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Nano Technology

Keywords

  • compressive strain, core-shell, GaSb-GaAsSb, heterostructure, nanowires, p-type transistors
Original languageEnglish
JournalNano Research
Publication statusE-pub ahead of print - 2020 Jun 19
Publication categoryResearch
Peer-reviewedYes