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Related Experiment Videos

Alloying effects on electromigration mass transport.

J P Dekker1, C A Volkert, E Arzt

  • 1Max-Planck-Institut für Metallforschung, Seestrasse 92, D-70174 Stuttgart, Germany.

Physical Review Letters
|July 20, 2001
PubMed
Summary
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Adding small amounts of alloying elements greatly slows down electromigration in conductor lines. This study proposes a new atomic-level mechanism based on diffusion kinetics to explain this widely observed phenomenon.

Area of Science:

  • Materials Science
  • Solid-State Physics
  • Physical Chemistry

Background:

  • Electromigration is a critical reliability issue in microelectronic conductor lines.
  • The phenomenon of electromigration retardation by alloying elements is experimentally confirmed but lacks a fundamental atomic-level explanation.

Purpose of the Study:

  • To propose a fundamental atomic-level mechanism explaining the retardation of electromigration by alloying elements.
  • To provide a theoretical basis for the observed effects of specific elements, like copper in aluminum, on electromigration.

Main Methods:

  • Kinetic analysis of atomic diffusion processes at crystalline interfaces.
  • Theoretical modeling based on diffusion coefficients and atomic interactions.

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Main Results:

  • A proposed mechanism predicts a reduction or reversal of host atom flux under electromigration.
  • The model is consistent with physically reasonable parameters for atomic diffusion.

Conclusions:

  • The proposed kinetic model offers a fundamental explanation for electromigration retardation by alloying elements.
  • This mechanism successfully accounts for the beneficial effect of copper on electromigration in aluminum conductor lines, enhancing device reliability.