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Elastic laser light scattering by GaAs surfaces
V A Sterligov1, Y V Subbota, Y M Shirshov
1Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, Prospect Nauki 45, 252650 Kiev 28, Ukraine. sterl@mail.kar.net
Applied Optics
|March 6, 2008
Summary
Angle-resolved scattering (ARS) reveals regular surface microrelief on GaAs crystals. This technique can characterize surface topography and crystal defects using different laser wavelengths.
Area of Science:
- Materials Science
- Solid State Physics
- Surface Science
Background:
- Gallium Arsenide (GaAs) is a crucial semiconductor material.
- Understanding GaAs surface properties is vital for device fabrication.
- Surface microrelief can impact electronic and optical properties.
Purpose of the Study:
- To investigate the surface microrelief of GaAs single crystals.
- To characterize the statistical properties of the surface microrelief.
- To propose a method for determining topographical properties and crystal defects.
Main Methods:
- Angle-resolved scattering (ARS) intensity measurements in the backscattering hemisphere.
- Analysis of (1 0 0) and (1 1 1) faces of GaAs single crystals.
- Laser elastic light scattering to detect surface microrelief.
Main Results:
- A regular surface microrelief was observed on GaAs crystals.
- The microrelief orientation correlates with crystallographic axes.
- Statistical properties of the microrelief were determined.
Conclusions:
- ARS is effective in revealing surface microrelief on GaAs.
- The ARS ratio at different wavelengths can quantify surface topography.
- This method aids in the study of crystal surface defects.
