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Title: Physics/Electromagnetism - Electromigration Surface electromigration refers to the directed motion of atoms (adatoms) at solid surfaces, grain boundaries and interfaces which is caused by an electric current in the bulk of the material. It is
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AG_Krug AG Krug Theoretische Physik CAMPUS  ESSEN Unilogo 

Surface Electromigration

Surface electromigration refers to the directed motion of atoms(adatoms) at solid surfaces, grain boundaries and interfaces which iscaused by an electric current in the bulk of the material. It isconsidered a key factor determining the reliability of integratedcircuits. As miniaturization progresses and current densitiesincrease, a detailed understanding of failure mechanisms is needed tosafely extrapolate from an accelerated testing environment to actualoperating conditions. It has been shown that a new type of failureappears when the line width of metallic interconnects becomescomparable to or smaller than the grain size of the film. In this"bamboo" regime grain boundaries no longer provide connecteddiffusion paths along the conductor line. Instead, failure occurs dueto intragranular voids which nucleate at the edges of the line,migrate in the current direction and eventually collapse into a slitwhich disconnects the conductor. This observation has motivated recenttheoretical work on the electromigration-induced motion and shapeevolution of voids. Since the conductor lines consist of thin metalfilms, two-dimensional modeling is appropriate.The conceptually simplest case consists of an insulating void in aninfinitely extended, isotropic, homogeneous two-dimensional conductor.A perfectly circular void then moves at a constant velocity inverselyproportional to its radius. The motion proceeds in the direction ofthe applied current. The momentum transfer from the conductionelectrons (the "electron wind") induces mass transport along the innersurface of the void, which therefore translates against the directionof electron flow. The circular solution is found to be linearlystable, however it is destabilized beyond a finite thresholdperturbation amplitude which depends on the ratio of the void radiusto a characteristic length scale determined by the balance ofcapillarity and electromigration; larger voids move more slowly andare less stable. The movie below shows the time evolution of a nearlycircular void which is initially elongated along the field directionand which becomes unstable in a budding scenario.movie time evolutionLiterature M. Schimschak und J. Krug, Surface Electromigration as a Moving Boundary Value Problem, PRL78, 278 (1997). M. Schimschak und J. Krug, Electromigration-Induced Breakup of Two-Dimensional Voids, PRL 80, 1674 (1998). M. Schimschak und J. Krug, Electromigration-driven shape evolution of two-dimensional voids, J.Appl.Physics, 87, 695 (2000). Valid HTML 4.0!
 

Surface

electromigration

refers

to

the

directed

motion

of

atoms

(adatoms)

at

solid

surfaces,

grain

boundaries

and

interfaces

which

is

caused

by

an

electric

current

in

the

bulk

of

the

material.

It

is

http://www.theo-phys.uni-essen.de/tp/forsch/krug.html

Electromigration 2008 December

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Surface electromigration refers to the directed motion of atoms (adatoms) at solid surfaces, grain boundaries and interfaces which is caused by an electric current in the bulk of the material. It is

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