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Related Experiment Videos

Migration processes of the 30 degrees partial dislocation in silicon.

Norihisa Oyama1, Takahisa Ohno

  • 1National Institute for Materials Science (NIMS), Tsukuba, Ibaraki, 305-0047 Japan.

Physical Review Letters
|December 17, 2004
PubMed
Summary

First-principles calculations reveal kink energies for 30 degrees partial dislocations in silicon, aligning with experiments. These findings highlight the dominance of this dislocation type in silicon and suggest reevaluating current dislocation dynamics models.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Materials Science

Background:

  • Dislocation migration is crucial for understanding plastic deformation in semiconductors like silicon.
  • Partial dislocations, specifically the 30-degree type, play a significant role in silicon's mechanical behavior.
  • Accurate determination of kink formation and migration energies is essential for modeling dislocation dynamics.

Purpose of the Study:

  • To investigate the migration processes of the 30-degree partial dislocation in silicon.
  • To provide a reliable first-principles determination of kink formation and migration energies.
  • To clarify the dominant dislocation mechanisms governing plastic deformation in silicon.

Main Methods:

  • First-principles total-energy calculations were employed.

Related Experiment Videos

  • Ab initio methods were used to simulate dislocation behavior.
  • Thermodynamic parameters for kink formation and migration were computed.

    • Main Results:

    • Reliable formation and migration energies for kinks on 30-degree partial dislocations were determined for the first time.
    • Calculated energies are consistent with existing experimental data.
    • The 30-degree partial dislocation was identified as the dominant factor in silicon dislocation dynamics.

    Conclusions:

    • The 30-degree partial dislocation significantly influences dislocation dynamics in silicon.
    • Results support a dislocation glide model based on the no-collision hypothesis.
    • Experimental interpretations of dislocation dynamics in silicon may require reevaluation based on these findings.