Strain-modulated adatom and surface vacancy pair interactions
Strain-modulated adatom and surface vacancy pair interactions
复制标题
DOI：
10.1115/1.1875392
复制
发表时间：
2005-05
期刊：
影响因子：
--
通讯作者：
P. Liu;R. Kukta;D. Kouris
中科院分区：
文献类型：
--
作者：
P. Liu;R. Kukta;D. Kouris
吸附原子（adatoms）和空位在表面物理和衬底上的薄膜生长机制中起着重要的作用。本文研究了外加应变或残余应变对吸附原子与空位间能量相互作用的影响。分析是基于一个连续水平的点缺陷模型，吸附原子和空位具有应变依赖性的属性。原子计算被用来评估Si（111）的缺陷性质。结果被用作输入的缺陷模型，以调查的强度和字符的相互作用与应变，分离距离，和相对取向的缺陷。研究发现，应变可以使缺陷在一定方向上排列，并调节它们之间的相互作用，排斥和吸引，提供了一种机制，为控制纳米结构的建设。
Adsorbed atoms (adatoms) and vacancies have a significant role to play in the physics of surfaces and the mechanisms of film growth on a substrate. This paper investigates the effect of applied or residual strain on the energetic interaction between pairs of adatoms and vacancies. The analysis is based on a continuum-level point-defect model, where adatoms and vacancies have strain-dependent properties. Atomistic calculations are used to evaluate the defect properties for Si(111). The result is used as input for the defect model in order to investigate the strength and character of the interaction versus strain, separation distance, and relative orientation of the defects. It is found that strain may cause the defects to align in certain direction and modulate their interaction between repulsion and attraction, providing a mechanism for controlled building of nanostructures.