Optimization of the nanotwin-induced zigzag surface of copper by electromigration

Hsin Ping Chen*, Chun Wei Huang, Chun Wen Wang, Wen-Wei Wu, Chien Neng Liao, Lih Juann Chen, King-Ning Tu

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Scopus citations


By adding nanotwins to Cu, the surface electromigration (EM) slows down. The atomic mobility of the surface step-edges is retarded by the triple points where a twin meets a free surface to form a zigzag-type surface. We observed that EM can alter the zigzag surface structure to optimize the reduction of EM, according to Le Chatelier's principle. Statistically, the optimal alternation is to change an arbitrary (111)/(hkl) zigzag pair to a pair having a very low index (hkl) plane, especially the (200) plane. Using in situ ultrahigh vacuum and high-resolution transmission electron microscopy, we examined the effects of different zigzag surfaces on the rate of EM. The calculated rate of surface EM can be decreased by a factor of ten.

Original languageEnglish
Pages (from-to)2584-2588
Number of pages5
Issue number5
StatePublished - 7 Feb 2016

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