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DY: Fachverband Dynamik und Statistische Physik

DY 2: Statistical Physics (general)

DY 2.9: Vortrag

Montag, 14. März 2011, 12:30–12:45, ZEU 255

Atomistic Modeling of Electromigration — •Andreas Latz and Dietrich E. Wolf — Fakultät für Physik, Universität Duisburg-Essen, D-47057 Duisburg

Strong electric fields lead to a directed movement of atoms in a current carrying conductor. This mass transport is called electromigration and is induced by interactions of the conducting electrons (wind force) and the electric field (direct force) with the atoms. Due to the high current densities (10⁶ A/cm²) in integrated circuits, electromigration-induced short circuits and voids are a problem.

We use the Kinetic Monte Carlo method to simulate the dynamics of voids in silver nanowires at the atomic scale. The dependence of the void form on the crystallographic orientation of the nanowire and the direction of the electric field will be shown. In a (001)-oriented silver wire squarelike voids can be observed, in contrast to a (111)-oriented wire, in which voids are triangular and pointed in migration direction. The simulation results are in agreement with experimental observations made with monocrystalline silver nanowires in the SFB 616 “Energy dissipation at surfaces”.