Abstract：
:On an SiO2-patterned c-plane sapphire substrate, GaN domains were grown with their polarity controlled in accordance with the pattern. While N-polar GaN was grown on hexagonally arranged circular openings, Ga-polar GaN was laterally overgrown on mask regions due to polarity inversion occurring at the boundary of the circular openings. After etching of N-polar GaN on the circular openings by H3PO4, this template was coated with 40-nm Si by sputtering and was slightly etched by KOH. After slight etching, a thin layer of Si left on the circular openings of sapphire,but not on GaN, was oxidized during thermal annealing and served as a dielectric mask during subsequent regrowth. Thus, the subsequent growth of GaN was made only on the existing Ga-polar GaN domains, not on the circular openings of the sapphire substrate. Transmission electron microscopy analysis revealed no sign of threading dislocations in this film. This approach may help fabricating an unholed and merged GaN film physically attached to but epitaxially separated from the SiO2-patterned sapphire.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Jang D,Jue M,Kim D,Kim HS,Lee H,Kim Cdoi
10.1038/s41598-018-22424-4subject
Has Abstractpub_date
2018-03-07 00:00:00pages
4112issue
1issn
2045-2322pii
10.1038/s41598-018-22424-4journal_volume
8pub_type
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