Journal
JOURNAL OF CRYSTAL GROWTH
Volume 576, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jcrysgro.2021.126387
Keywords
Hydride vapor phase epitaxy; Selective epitaxy; Gallium compounds; Oxides; Semiconducting gallium compounds
Funding
- Innovative Science and Technology Initiative for Security [JPJ004596]
- ATLA, Japan
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Etch pits were observed on a c-plane alpha-Ga2O3 epilayer using HCl gas etching, indicating a correlation between etch pit density and dislocation density. Gas-etching technique can effectively reveal dislocation distribution in a wide area, which is challenging to explore using traditional TEM.
Threading dislocations in a heteroepitaxial alpha-Ga2O3 film was visualized as etch pits on the surface. We found that etch pits were formed on a c-plane alpha-Ga2O3 epilayer by HCl gas etching. The epilayer was prepared by using epitaxial lateral overgrowth technique with a stripe mask pattern. The etch pit density was very high in the window region, and much lower in the laterally grown area on the mask. A line of etch pits was observed at a coalesced boundary. Thus, the etch pit density had a clear correlation with the dislocation density. The correspondence between the etch pits and dislocations was confirmed by cross-sectional bright- and dark-field transmission electron microscopy (TEM). This gas-etching technique can clarify the distribution of dislocations in a wide area, which cannot be explored effectively by TEM.
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