Figure 3a

High-resolution SEM image of a GaN layer grown under Ga-rich conditions. The excess Ga has formed droplets which are trapped in trenches.

(click for full image)

Figure 3b

High-resolution SEM image of a GaN layer grown under Ga-rich conditions. The removal of the Ga-droplets revealed nano-crystallites on the walls and edges of the trenches.

(click for full image)

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