Misfit-dislocation-mediated heteroepitaxial island diffusion

SURFACE SCIENCE

卷:604

Article

Signor, A. W.¹  Wu, Henry H.¹  Trinkle, Dallas R.¹ 

[1] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA

关键词: Surface diffusion;    Scanning tunneling microscopy;    Molecular dynamics;    Copper;    Silver;   

DOI  :  10.1016/j.susc.2010.08.003

来源: Elsevier

【 摘 要 】

Scanning tunneling microscopy combined with molecular dynamics simulations reveals a dislocation-mediated island diffusion mechanism for Cu on Ag(111), a highly mismatched system. Cluster motion is tracked with atomic precision at multiple temperatures and diffusion barriers and prefactors are determined from direct measurements of hop rates. The barrier to nucleate a dislocation is sensitive to island size and shape, resulting in a non-monotonic size dependence of the diffusion barrier. (C) 2010 Elsevier B.V. All rights reserved.

【 授权许可】

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