Comparison of spatial resolutions obtained with different signal components in scanning electron microscopy

Area of Science:

• Materials Science
• Electron Microscopy
• Surface Analysis

Background:

• Scanning Electron Microscopy (SEM) relies on electron signals for imaging.
• Spatial resolution is critical for detailed surface analysis.
• Compositional contrast offers insights into material heterogeneity.

Purpose of the Study:

• To compare the ultimate spatial resolution of SEM using different electron signal components.
• To investigate methods for enhancing the contribution of delocalized electron signals.
• To evaluate a novel detector system for low-voltage SEM.

Main Methods:

• Comparative analysis of SEM spatial resolution with various electron signal components.
• Utilizing a specifically designed setup to amplify delocalized signal contributions.
• Employing a device with a high secondary yield material to enhance electron signals.
• Testing a detector system combining Everhart-Thornley detector with an electron converter.

Main Results:

• Delocalized signal components, such as backscattered and forward scattered electrons, yield spatial resolution near the beam size.
• Signal amplification using a high secondary yield plate improves the contribution of delocalized signals.
• Practical application can be limited by noise in the delocalized signal.
• The developed detecting system demonstrates high performance for low-voltage SEM observations.

Conclusions:

• Delocalized electron signals are key to achieving high spatial resolution in SEM.
• A novel detector configuration significantly enhances low-voltage SEM capabilities.
• This research offers practical implications for advanced electron microscopy techniques.