Determination of electric current induced motion of a symmetrically tilt Σ5 grain boundary in aluminum using quantum transport calculations
Xin Su , Zhanxin Xiao , Yuanshen Qi , Yaron Amouyal , Nan Wang
Microstructures ›› 2026, Vol. 6 ›› Issue (2) -2026039.
Electric current induced structural change is a critical reliability issue in nanoelectronics. So far, microstructure evolution models have considered the electromigration (EM) force caused by high current density to be uniform everywhere in the conductor. In this work, the EM force acting on atoms near Σ5 grain boundaries (GBs) of aluminum is calculated for the first time using a quantum transport method. Although the EM forces exhibit a complex distribution near the GB, the regional averaged EM force from GB atoms points toward the opposite direction of the bulk EM force. This striking result leads to GB motion in the direction of the electron current, whereas previous structural evolution models considering uniform EM forces predict GB motion in the opposite direction. This result highlights the necessity to consider the current-induced grain structure evolution at quantum mechanical level since the local EM force on atoms depends on the electron scattering behavior of the GB structure.
Grain boundary / electromigration / multiscale modelling
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