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Characterization of nanostructured GaSb: comparison between large-area optical and local direct microscopic
I S Nerbø1, M Kildemo, S Le Roy
1Department of Physics, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway. ingar.nerbo@ntnu.no
Applied Optics
|October 3, 2008
Summary
Low energy ion-beam sputtering creates self-organized gallium antimonide (GaSb) nanostructures. Optical methods like ellipsometry effectively characterize these nanostructures, complementing microscopy techniques for large-area analysis.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Science
Background:
- Low energy ion-beam sputtering is a technique used for surface modification.
- Gallium antimonide (GaSb) nanostructures can be self-organized using this method.
- Characterizing nanostructured surfaces is crucial for understanding their properties and applications.
Purpose of the Study:
- To investigate the characterization of self-organized GaSb nanostructures using optical methods.
- To compare optical characterization results with direct microscopic measurements.
- To evaluate the potential of optical techniques for large-area nanostructure analysis.
Main Methods:
- Preparation of GaSb nanostructures via low energy ion-beam sputtering.
- Optical characterization using spectroscopic ellipsometry (0.6-6.5 eV) and Mueller matrix ellipsometry (1.46-2.88 eV).
- Topographical analysis using scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), and atomic force microscopy (AFM).
Main Results:
- Good agreement was found between optical and microscopic characterization methods.
- A graded anisotropic effective medium model successfully correlated optical response with topography for shorter cones (<55 nm).
- Average cone height was identified as a key topological parameter.
Conclusions:
- Optical methods, particularly ellipsometry, are valuable, fast, and nondestructive tools for characterizing nanostructured surfaces.
- These techniques are suitable for large-area analysis and can be adapted for in situ monitoring.
- The study demonstrates the effectiveness of optical methods in complementing traditional microscopy for GaSb nanostructures.
