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Related Experiment Videos

Improved interatomic potentials for silicon-fluorine and silicon-chlorine.

David Humbird1, David B Graves

  • 1Department of Chemical Engineering, University of California, Berkeley, California 94720, USA.

The Journal of Chemical Physics
|July 23, 2004
PubMed
Summary

New empirical potentials for silicon-fluorine and silicon-chlorine accurately model halogen interactions with silicon surfaces. Molecular dynamics simulations using these potentials match experimental etch data, improving surface science understanding.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Surface Science

Background:

  • Accurate modeling of silicon-halogen interactions is crucial for semiconductor processing.
  • Existing empirical potentials may not fully capture the complexities of these interactions.

Purpose of the Study:

  • To develop and validate improved empirical interatomic potentials for silicon-fluorine (Si-F) and silicon-chlorine (Si-Cl) systems.
  • To assess the performance of these potentials in simulating halogen etching of silicon surfaces.

Main Methods:

  • Reparameterization of the Tersoff-Brenner potential form.
  • Utilizing density-functional theory (DFT) cluster calculations for parameter fitting.
  • Performing molecular-dynamics simulations of halogen atom exposure to silicon surfaces.

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Main Results:

  • Reparameterized potentials show excellent agreement with DFT calculations for halogenated silicon cluster energetics.
  • Molecular dynamics simulations using the new potentials accurately reproduce experimental data on etch probability and halogen coverage.
  • Simulations also align well with published etch product distributions.

Conclusions:

  • The reparameterized Tersoff-Brenner potentials provide a reliable tool for simulating Si-F and Si-Cl interactions.
  • These improved potentials enhance the understanding of halogen etching mechanisms on silicon surfaces.