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SEM image of InGaN nanorings grown on the GaN surface and diameter distribution of the nanorings (inserted). In the diameter distribution, region A shows the statistical diameter distribution of inner holes and region B shows that of outer rings.
(Color online) AFM three-dimensional view of the InGaN nanorings.
SEM image of InGaN nanodots grown on the GaN surface.
Photoluminescence spectrum of InGaN nanorings at room temperature, better uniform and ordered nanorings (a), and less uniform and ordered nanorings (b).
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