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Revealing the pulse-induced electroplasticity by decoupling electron wind force.

Xing Li1, Qi Zhu1, Youran Hong1

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Electrical pulses cause degradation in nanodevices. This study reveals pulse-induced migration of twin boundaries in gold nanocrystals is driven by electron-dislocation interactions, not electron wind force.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Micro/nano electromechanical systems (MEMS) and nanodevices are susceptible to degradation under electrical pulse stress.
  • The fundamental mechanisms driving pulse-induced degradation in these systems remain incompletely understood.

Purpose of the Study:

  • To investigate the defect dynamics and migration mechanisms in gold (Au) nanocrystals subjected to electrical pulsing.
  • To elucidate the origin of pulse-induced degradation by decoupling the effects of electron wind force and other interactions.

Main Methods:

  • In situ transmission electron microscopy (TEM) electropulsing experiments were designed to isolate and analyze defect behavior.
  • Quantitative analysis was performed to determine the forces governing the migration of Σ3{112} incoherent twin boundaries.

Main Results:

  • A non-directional migration of Σ3{112} incoherent twin boundaries was observed under electropulsing.
  • This migration was found to be governed by electron-dislocation interactions, which enhance atomic vibrations at dislocation cores.
  • The observed migration is contrary to the expected directional movement driven solely by electron wind force.

Conclusions:

  • The study identifies electron-dislocation interaction as the primary mechanism for incoherent twin boundary migration under electrical pulsing in Au nanocrystals.
  • These findings offer critical insights into the phenomenon of electroplasticity at the atomic level.
  • The results are significant for understanding electromigration and electrical failure mechanisms in micro/nano-electronic devices.