NOVEL FORMATION AND DECAY MECHANISMS OF NANOSTRUCTURES ON THE SURFACE
Wand En-ge (王恩哥)ab, Liu Bang-gui (刘邦贵)a, Wu Jing (吴静)a, Li Mao-zhi (李茂枝)a, Yao Yu-gui (姚裕贵)a, Zhu Wen-guang (朱文光)a, Zhong Jian-xin (钟建新)c, John Wendelkenc, Niu Qian (朱谦)bd, Zhang Zhen-yu (张振宇)bc
a Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; b International Center for Quantum Structures, Chinese Academy of Sciences, Beijing China; c Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA; d Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
Abstract For decades the research on thin-film growth has attracted considerable attention as these kinds of materials have the potential for a new generation of device application. It is known that the nuclei at the initial stage of the islands are more stable than others and certain atoms are inert while others are active. In this paper, by using kinetic Monte Carlo simulations, we will show that, when a surfactant layer is used to mediate the growth, a counter-intuitive fractal-to-compact island shape transition can be induced by increasing deposition flux or decreasing growth temperature. Specifically, we introduce a reaction-limited aggregation (RLA) theory, where the physical process controlling the island shape transition is the shielding effect of adatoms stuck to the stable islands on the incoming adatoms. Moreover, the origin of a transition from triangular to hexagonal and then to inverted triangular as well as the decay characteristics of three-dimensional islands on the surface and relations of our unique predictions with recent experiments will be discussed. Furthermore, we will present a novel idea to make use of the condensation energy of adatoms to control the island evolution along a special direction.
Received: 06 March 2001
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 19974069 and No. 19928409), by the State Key Program of Basic Research of China (Grant No. 62000067103), and by the Oak Ridge National Laboratory, managed by UT-Battell, LLC,
Cite this article:
Wand En-ge (王恩哥), Liu Bang-gui (刘邦贵), Wu Jing (吴静), Li Mao-zhi (李茂枝), Yao Yu-gui (姚裕贵), Zhu Wen-guang (朱文光), Zhong Jian-xin (钟建新), John Wendelken, Niu Qian (朱谦), Zhang Zhen-yu (张振宇) NOVEL FORMATION AND DECAY MECHANISMS OF NANOSTRUCTURES ON THE SURFACE 2001 Chinese Physics 10 144
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