Atomic scale observation of threading dislocations in α-Ga2O3

Ross Mullen, Joseph W. Roberts, Paul R. Chalker, Rachel A. Oliver, Ben Hourahine, Fabien C.P. Massabuau*

*Corresponding author for this work

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Abstract

This study presents a statistically significant investigation of threading dislocations in α-Ga2O3 using high-resolution transmission electron microscopy. All the dislocations, observed end-on, exhibit a projected Burgers vector be = 1/3 ⟨1-100⟩, with data revealing that the dislocations fall into three categories: perfect mixed (b = 1/3 ⟨1-101⟩) dislocations and edge (b = ⟨1-100⟩ and b = 1/3 ⟨11-20⟩) dislocations which dissociate into combinations of b = 1/3 ⟨1-100⟩ partials. High-resolution analysis of the core region of the dislocations identifies that all the dislocations exhibit a similar 5-atom core, when looking at the cation sites. This is the first investigation of its kind in this material system, which will inform future work to, for example, understand the electronic properties of dislocations in α-Ga2O3 and other epitaxial corundum-structured materials.
Original languageEnglish
Article number115018
Number of pages6
JournalAIP Advances
Volume14
Issue number11
DOIs
Publication statusPublished - 14 Nov 2024

Funding

The authors acknowledge the support from the Engineering and Physical Sciences Research Council (EPSRC grants No. EP/M010589/1, EP/K014471/1).

Keywords

  • α-Ga2O3
  • transmission electron microscopy
  • threading dislocations

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