Origin of extra diffraction spots for high crystalline alpha-Ga2O3

Lee, Yong-Hee; Yang, Dooyoung; Gil, Byeongjun; Sheen, Mi-Hyang; Yoon, Euijoon; Park, Yongjo; Jang, Ho Won; Yoon, Sangmoon; Kim, Miyoung; Kim, Young-Woon

doi:10.1063/5.0136783

AIP Advances

2023

DOI: 10.1063/5.0136783

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Origin of extra diffraction spots for high crystalline alpha-Ga2O3

Yong-Hee Lee

Dooyoung Yang

Byeongjun Gil

et al.

Abstract: This work has investigated the microstructure characteristics of high-quality alpha-Ga2O3 thin film grown on the Al2O3 single crystal substrate membrane. Hetero-epitaxial alpha Ga2O3 crystals reveal the formation of a three-fold symmetry at the initial stage of the growth by the oxygen template provided by the Al2O3. Inversion domains are found, and they have a 180° inverted configuration from the surroundings. These IDs lead to extra diffraction spots when observed along [110] and [010].

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Atomic scale observation of threading dislocations in α-Ga2O3

Mullen,

Roberts,

Chalker

et al. 2024

AIP Advances

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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=13⟨11̄00⟩, with data revealing that the dislocations fall into three categories: perfect mixed (b=13⟨11̄01⟩) dislocations and edge (b=⟨11̄00⟩ and b=13⟨112̄0⟩) dislocations, which dissociate into combinations of b=13⟨11̄00⟩ 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.

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Atomic scale observation of threading dislocations in α-Ga2O3

Mullen,

Roberts,

Chalker

et al. 2024

AIP Advances

View full text Add to dashboard Cite

show abstract

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Origin of extra diffraction spots for high crystalline alpha-Ga2O3

Cited by 1 publication

References 21 publications

Atomic scale observation of threading dislocations in α-Ga2O3

Atomic scale observation of threading dislocations in α-Ga2O3

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