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AFM images of GaSb nanostructures formed by crystallizing 3 monolayers of gallium with an 8 × 10−7 Torr Sb flux for (a) 2 s at 200 °C, (b) 10 s at 250 °C featuring holes (circled), and (c) 10 s at 300 °C featuring holes (circled), 3D islands (arrows), and disks.
AFM images of GaSb nanostructures formed by crystallizing 3 monolayers of gallium with an 8 × 10−7 Torr antimony flux for 10 s at 400 °C. Holes (circled), perimeter 3D islands (arrow), and a halo of additional 3D islands are featured.
A schematic illustrating the volume of crystallized GaSb. Crystallization begins at the triple point and can be modeled with a toroid of volume Vc. The volume is the product of the cross sectional area and the radius to the toroid's center. Additional shape factors, α and β for the cross section and droplet perimeter, respectively, are necessary.
Kinetic Monte Carlo simulations of lattice mismatched toroids annealed at 300 °C (a) and (b), and 400 °C (c) and (d). The lower temperature toroid was small in size to emulate experimental conditions. The results presented in (b) and (d) closely resemble the 3D rings and islands in Figures 1(c) and 2(a) , respectively.
An AFM image of GaSb nanostructures formed by crystallizing 4 monolayers of liquid gallium with an 8 × 10−7 Torr antimony flux for 5 s featuring 3D islands (arrows).
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