Evolution of mixed hut and pyramid ensembles during growth temperature annealing. STM images of islands grown at after (a) , (b) , (c) , and (d) of growth temperature annealing.
Individual island volumes as a function of growth temperature annealing time. Elongated huts eventually dissolve, while pyramid-like clusters are stable and grow.
Basal aspect ratio distribution at two different times (160 and ) during the anneal. The initial broad distribution of aspect ratios narrows significantly and centers around aspect ratios representing pyramid-like clusters by the end of the anneal.
Elastic energy per cluster atom for clusters as a function of basal aspect ratios of , , and . Pyramid-like clusters are more stable than hut clusters with much larger volumes.
Decrease in the total island volume within the STM field of view as a function of anneal time.
(a) inverted contrast atomic force micrograph of a typical large Ge cluster present after the anneal. The image is thresholded in order to show the smaller Ge islands in the background. (b) Radial distribution of island density away from the center of the large cluster in Fig. 6(a), indicating a denuded zone of width .
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