中国物理B ›› 2001, Vol. 10 ›› Issue (11): 1043-1048.doi: 10.1088/1009-1963/10/11/310

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EFFECTS OF ISLAND-EDGE EXCHANGE BARRIER ON 2D PATTERN FORMATION IN SURFACTANT-MEDIATED EPITAXY

孙霞1, 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:2001-03-20 修回日期:2001-06-12 出版日期:2001-11-15 发布日期:2005-06-12
  • 基金资助:
    Project supported by the Natural Science Foundation of Anhui Province, China (Grant No. 99047217).

EFFECTS OF ISLAND-EDGE EXCHANGE BARRIER ON 2D PATTERN FORMATION IN SURFACTANT-MEDIATED EPITAXY

Wang Dai-mu (王戴木)a, Sun Xia (孙霞)b, 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:2001-03-20 Revised:2001-06-12 Online:2001-11-15 Published:2005-06-12
  • Supported by:
    Project supported by the Natural Science Foundation of Anhui Province, China (Grant No. 99047217).

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摘要： The nucleation and growth of two-dimensional islands in a surfactant-mediated epitaxy system have been studied by computer simulation. To improve the recent results published in the literature, we use a configuration-dependent energy barrier for the exchange process at the island edge in our model. The simulations produce fractal islands at high temperatures or low deposition fluxes, and a transition to regular compact islands occurs at lower temperatures or higher fluxes, in good agreement with the recent experimental results. The barrier for the island-edge exchange has quite a strong effect on the island density as a function of temperature and flux. A small change of the island-edge exchange barrier induces a large variation of the island density in the low-temperature or high-flux region. The flux-dependent island density shows a clear scaling-law behaviour in the intermediate-flux region. The scaling exponent increases evidently as the island-edge exchange barrier increases.

Abstract: The nucleation and growth of two-dimensional islands in a surfactant-mediated epitaxy system have been studied by computer simulation. To improve the recent results published in the literature, we use a configuration-dependent energy barrier for the exchange process at the island edge in our model. The simulations produce fractal islands at high temperatures or low deposition fluxes, and a transition to regular compact islands occurs at lower temperatures or higher fluxes, in good agreement with the recent experimental results. The barrier for the island-edge exchange has quite a strong effect on the island density as a function of temperature and flux. A small change of the island-edge exchange barrier induces a large variation of the island density in the low-temperature or high-flux region. The flux-dependent island density shows a clear scaling-law behaviour in the intermediate-flux region. The scaling exponent increases evidently as the island-edge exchange barrier increases.

Key words: Monte Carlo simulation, epitaxy, growth, fractal

中图分类号:  (Nucleation and growth)

  • 68.55.A-
81.15.-z (Methods of deposition of films and coatings; film growth and epitaxy) 82.70.Uv (Surfactants, micellar solutions, vesicles, lamellae, amphiphilic systems, (hydrophilic and hydrophobic interactions))