Related Experiment Videos
Dynamical simulation of LACBED patterns in cross-sectioned heterostructures
Wu1, Armigliato, Balboni
1CNR-Istituto LAMEL, Bologna, Italy.
Micron (Oxford, England : 1993)
|March 7, 2000
Summary
Large Angle Convergent Beam Electron Diffraction (LACBED) precisely determined tetragonal mismatch in Si/Si1-xGex/Si heterostructures. Dynamical simulations accurately reproduced experimental patterns, confirming strain field effects.
Area of Science:
- Materials Science
- Solid State Physics
- Crystallography
Background:
- Si/Si1-xGex/Si heterostructures are crucial in semiconductor technology.
- Understanding lattice mismatch and strain is vital for device performance.
- Electron diffraction offers insights into crystal lattice distortions.
Purpose of the Study:
- To determine the tetragonal mismatch in coherent Si/Si1-xGex/Si heterostructures.
- To validate the application of Large Angle Convergent Beam Electron Diffraction (LACBED) for strain analysis.
- To investigate the strain field effects within these heterostructures.
Main Methods:
- Application of the Large Angle Convergent Beam Electron Diffraction (LACBED) technique.
- Performing two-dimensional (2D) dynamical simulations of LACBED patterns.
- Comparing simulated LACBED patterns with experimental data.
Main Results:
- Successful determination of tetragonal mismatch in Si/Si1-xGex/Si heterostructures.
- Excellent agreement between simulated and experimental LACBED patterns.
- Observed splitting of Bragg contours attributed to strain fields in TEM cross-sections.
Conclusions:
- LACBED is a reliable technique for quantifying tetragonal mismatch in heterostructures.
- Dynamical simulations effectively model experimental LACBED patterns.
- Strain fields significantly influence diffraction characteristics in Si/Si1-xGex/Si systems.