Abstract
The experimental island shapes of III–V islands grown on silicon (001) in the Volmer-Webergrowth mode are analyzed in the frame of the theory of wetting in crystals. A reverse Wulff-Kaishew (or Winterbottom) construction is used in order to access interfacial energy. We applythis approach to AlSb and GaSb islands on (001) Si grown by molecular beam epitaxy andobserved by scanning transmission electron microscopy. Experimental ratios between energies of(001), (110), (111)A, and (111)B surfaces are established. Interface energies are then quantitativelyestimated for GaSb/Si and AlSb/Si interfaces. The differences in the shape of GaSb and AlSbislands, which are consistently reported in the literature, can be clearly attributed to a higher energyfor the GaSb/Si interface compared to the ASb/Si one and not to different adatom diffusion lengths.The difference in interface energies is quantified, and its origin at the microscopic level is discussed.