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(a) STEM image of the AlGaN/GaN m-plane structure with lower Al content taken along the  zone axis; (b) HRTEM 0002 two beam image of the AlGaN/GaN structure with higher Al content with high density of AlN precipitations—the AlGaN/GaN structure is no longer discernible.
HRTEM images of the AlN layer taken along: (a) the  zone axis, SFs confined in the AlN layer are indicated by arrows; (b) along the  zone axis; (c) image of PDs with Burgers vector b = 1/2〈0001〉 and corresponding Bragg images created using (d) g0002 and (e) g; and (f) image of PDs with Burgers vector b = 1/6〈〉 and corresponding Bragg images created using (g) g0002 and (h) g.
(Color online) (a) AFM amplitude image of the surface of the m-plane GaN layer grown on the m-plane GaN bulk substrate; (b) AFM image of the boxed area indicated on (a); (c) The AFM image of the surface of the AlGaN/GaN structure with higher Al content; (d) The scheme showing the formation of AlN platelets on plateaus on the m-plane GaN surface and the mechanism of the SFs introduction.
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