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Related Experiment Videos

Influence of supersaturation on surface structure.

J B Hannon1, J Tersoff, M C Reuter

  • 1IBM Research Division, T.J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598, USA.

Physical Review Letters
|December 18, 2002
PubMed
Summary

External flux influences silicon surface structure during growth and etching. Varying adatom supersaturation alters surface free energies, changing phase boundary configurations and indicating shifts in phase transition temperature.

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Area of Science:

  • Surface Science
  • Materials Science
  • Physical Chemistry

Background:

  • The Si(111) surface exhibits distinct 7x7 and '1x1' phases.
  • Understanding phase transitions is crucial for controlling surface morphology during material processing.

Purpose of the Study:

  • To investigate the impact of external flux on Si(111) surface structure.
  • To quantify the relationship between adatom supersaturation and surface free energy differences.

Main Methods:

  • Low-energy electron microscopy (LEEM) was employed.
  • In-situ measurements during growth and etching at elevated temperatures were performed.

Main Results:

  • External flux was found to modify the surface free energies of coexisting 7x7 and '1x1' phases.

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  • Phase boundary configurations reached a new steady state.
  • The difference in free energy (Deltagamma) between phases was quantitatively determined.

    • Conclusions:

    • Measured Deltagamma changes correlate with local adatom supersaturation.
    • This provides a method to determine phase transition temperature shifts.
    • Surface free energy and phase behavior are controllable via external flux.