MULTIPLE CLUSTER GROWTH OF ULTRA-THIN FILMS WITH ANISOTROPIC EDGE DIFFUSION

摘要

The multiple cluster growth of ultra-thin films on a hexagonal substrate with fractal, dendritic and compactrnmorphology has been studied by computer simulation. The influence of the different diffusion processes along islandrnedges on the island shape has been investigated. The results show that the anisotropic corner diffusion induces therndendritic growth, and the anisotropic step diffusion can promote the anisotropic growth and cause the ramified islandsrngrowing in three directions. In the case of compact growth, the island shape is mainly determined by the anisotropicrncorner crossing process. The nonuniform distribution of the multiple cluster formation can be described quantitativelyrnby multifractal. With patterns changing from fractal to compact islands, the width and height of the bell-like orrnhook-like multifractal spectra increase, while the top f(α) decreases.