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Strain evolution in coherent Ge/Si islands

Liu1, Gibson, Cahill

  • 1Materials Research Laboratory, University of Illinois at Urbana-Champaign, 104 South Goodwin Avenue, Urbana, Illinois 61801, USA.

Physical Review Letters
|October 4, 2000
PubMed
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Strain evolution in Germanium (Ge) islands on Silicon (Si) surfaces was measured. A metastable island shape influences the transition between pyramid and dome structures, indicating a first-order shape transition.

Area of Science:

  • Materials Science
  • Solid State Physics
  • Nanotechnology

Background:

  • Coherent Germanium (Ge) islands grown on Silicon (Si) substrates exhibit complex shape transitions.
  • Understanding strain evolution is crucial for controlling island morphology and device properties.

Purpose of the Study:

  • To investigate the strain evolution during shape transitions of Ge islands on Si(001).
  • To identify intermediate shapes and understand the kinetics of shape transitions.

Main Methods:

  • Utilized a novel transmission electron microscopy (TEM) technique.
  • Employed two-beam dark-field strain imaging for precise strain measurements.

Main Results:

  • Observed a metastable Ge island shape mediating the transition from pyramid to dome structures.

Related Experiment Videos

  • Found this metastable shape is more prevalent at 550°C compared to 600°C due to slower kinetics.
  • Demonstrated a discontinuous change in strain relaxation between pyramid and dome shapes.

    • Conclusions:

    • The shape transition between Ge island pyramids and domes is a first-order phase transition.
    • Strain relaxation dynamics are intrinsically linked to the island's morphological evolution.