Shape-dependent composition profile in epitaxial alloy quantum dots: A phase-field simulation

被引：14
|
作者：
Liang, X. D. [1 ,2 ]
Ni, Y. [1 ]
He, L. H. [1 ]
机构：
[1] Univ Sci & Technol China, CAS Key Lab Mech Behav & Design Mat, Hefei 230026, Anhui, Peoples R China
[2] Hefei Univ Technol, Sch Civil Engn, Hefei 230009, Anhui, Peoples R China
来源：
COMPUTATIONAL MATERIALS SCIENCE | 2010年 / 48卷 / 04期
关键词：
Alloy quantum dot; Composition segregation; Diffusion; Phase field; FILMS; NANOSTRUCTURES; NANOCRYSTALS; EVOLUTION; SI(001); MODEL;
D O I：
10.1016/j.commatsci.2010.04.005
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A phase-field microelasticity model is developed to probe the interplay between shape and composition profile in epitaxial alloy quantum dots, and special attention is focused on the competition between chemical mixing and strain energies due to lattice mismatch. Our simulation shows that the inhomogeneous stress distribution in the dot drastically depends on the dot shape and thus leads to a nonuniform composition distribution. The stress-driven composition segregation is size-dependent: the larger the height-to-width ratio of the quantum dot, the more nonuniform the stress map and the larger the composition segregation. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：871 / 874
页数：4
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