Nanotwin formation in copper thin films by stress/strain relaxation in pulse electrodeposition

Di Xu*, Wei Lek Kwan, Kai Chen, Xi Zhang, Vidvuds Ozolinš, King-Ning Tu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

Nanotwinned copper has been shown to greatly improve the yield strength while maintaining good electrical conductivity. It has great potential to be incorporated in the very-large-scale integration of Cu interconnect technology. The influence of stress/strain on nanotwin formation is studied using first principles calculations of the total crystal binding energy. Under biaxial stress, the total energy of strained Cu can be larger than that of strain-relaxed periodic nanotwinned Cu. We propose that, during pulse electrodeposition of Cu films, highly strained Cu can undergo recrystallization and grain growth to relax stress and form strain-relaxed nanotwins.

Original languageEnglish
Article number254105
JournalApplied Physics Letters
Volume91
Issue number25
DOIs
StatePublished - 1 Dec 2007

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