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Island nucleation in a reactive two-component system.

T H McDaniels1, J A Venables, P A Bennett

  • 1Department of Physics and Astronomy, Arizona State University, Tempe, Arizona 85287-1504, USA.

Physical Review Letters
|November 3, 2001
PubMed
Summary
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Titanium silicide island formation involves a highly mobile titanium species, not dimer-vacancy hopping. This critical nucleus requires a specific activation energy for nucleation near 500°C.

Area of Science:

  • Materials Science
  • Surface Science
  • Thin Film Deposition

Background:

  • Titanium silicide (TiSi2) islands are crucial in semiconductor manufacturing.
  • Understanding nucleation mechanisms is key to controlling film growth and properties.

Purpose of the Study:

  • To investigate the nucleation mechanism of titanium silicide islands during reactive deposition.
  • To determine the critical nucleus size and activation energy for island formation.

Main Methods:

  • Analysis of flux and temperature dependence of titanium silicide island formation.
  • Calculation of surface diffusion and cluster binding energies.

Main Results:

  • A critical nucleus of 2 Ti atoms was identified.

Related Experiment Videos

  • The activation energy for nucleation was determined to be 1.4 ± 0.2 eV.
  • Observed nucleation behavior contradicts lower-temperature STM findings of Ti dimer-vacancy hopping.

    • Conclusions:

    • Silicide island nucleation at ~500°C involves a distinct, highly mobile Ti species.
    • The nucleation pathway differs significantly from mechanisms observed at lower temperatures.