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Schematic band alignment in the structures with (a) dome and (b) hut islands. Positions of the electron valleys and the heavy hole bands are shown.
(Color online) AFM images of the structures with (a) dome islands grown at (image size of ) and (b) hut islands grown at (image size of ). The color scale in the images corresponds to the local surface height. Take note of the large difference in scale of the AFM images.
PL spectra of the structures with islands grown at (1) , (2) , (3) , and (4) . The PL spectra are normalized on the maximum of the signal from the islands and shifted in the vertical direction for clarity.
Experimental dependence of the island-related PL peak position on . The vertical lines show the full width at half maximum of the PL peaks for each . The dashed line corresponds to the transition from dome to hut islands.
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