Multiple angle ellipsometric analysis of surface layers and surface layer contaminants.

Area of Science:

• Materials Science
• Optical Physics
• Surface Science

Background:

• Accurate characterization of thin films and surface contaminants is crucial for optical and semiconductor industries.
• Traditional methods may struggle with complex multilayered samples or identifying unknown contaminants.

Purpose of the Study:

• To present a multiple angle ellipsometric method for precise optical constant (N and K) determination.
• To demonstrate the method's applicability to diverse substrate-film and substrate-contaminant systems.

Main Methods:

• Utilized multiple angle ellipsometry to analyze optical properties.
• Evaluated fundamental optical constants (refractive index N and extinction coefficient K).
• Applied the method to samples including silicon oxide, silicon nitride, and contaminant layers.

Main Results:

• Successfully measured optical constants for various thin film and contaminant layers.
• Demonstrated applicability to silicon-based substrates and gallium arsenide.
• Validated the method for partially transparent layers in known multilayer structures.

Conclusions:

• Multiple angle ellipsometry provides a robust method for characterizing thin films and contaminants.
• The technique is suitable for quality control and research in optical and semiconductor fabrication.
• Accurate optical constant data is essential for predicting and optimizing device performance.