中国物理B ›› 2001, Vol. 10 ›› Issue (1): 46-51.doi: 10.1088/1009-1963/10/1/311

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

吴自勤1, 王戴木2   

  1. (1)Department of Astronomy and Applied Physics, University of Science and Technology of China, Hefei 230026, China; (2)Department of Physics, Fuyang Teachers College, Fuyang 236032, China
  • 收稿日期:2000-05-24 出版日期:2001-01-15 发布日期:2005-07-11
  • 基金资助:
    Project supported by the Natural Science Foundation of Auhui Province, China (Grant No. 99047217).

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

Wang Dai-mu (王戴木)a, Wu Zi-qin (吴自勤)b    

  1. a Department of Physics, Fuyang Teachers College, Fuyang 236032, China; b Department of Astronomy and Applied Physics, University of Science and Technology of China, Hefei 230026, China
  • Received:2000-05-24 Online:2001-01-15 Published:2005-07-11
  • Supported by:
    Project supported by the Natural Science Foundation of Auhui Province, China (Grant No. 99047217).

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

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

Key words: thin film growth, computer simulation, multifractal

中图分类号:  (Whiskers and dendrites (growth, structure, and nonelectronic properties))

  • 68.70.+w
68.90.+g (Other topics in structure, and nonelectronic properties of surfaces and interfaces; thin films and low-dimensional structures) 66.30.-h (Diffusion in solids)