Imaging modes for potential mapping in semiconductor devices by electron holography with improved lateral resolution

Area of Science:

• Materials Science
• Nanotechnology
• Physics

Background:

• Electron holography is crucial for nanoscale dopant profiling.
• Existing methods using standard objective lenses offer limited fields of view (approx. 10 nm).
• Lorentz lens microscopy provides a wider field of view (up to 1000 nm) but with lower lateral resolution (approx. 10 nm).

Purpose of the Study:

• To develop improved electron optical configurations for electron holography.
• To enhance both field of view and lateral resolution for nanoscale dopant profiling.
• To address the limitations of current electron holography techniques for shrinking semiconductor structures.

Main Methods:

• Investigated alternative electron optical paths for hologram recording.
• Focused on optimizing parameters for field of view and lateral resolution.
• Utilized standard objective and diffraction lenses, eliminating the need for a Lorentz lens for non-magnetic materials.

Main Results:

• An optimized scheme achieved a field of view of 200 nm with a lateral resolution of 3.3 nm.
• This new configuration bridges the gap between existing high-resolution and wide-field-of-view methods.
• Demonstrated applicability for future semiconductor technology through an example.

Conclusions:

• The developed electron optical scheme significantly improves capabilities for nanoscale dopant profiling.
• This advancement is vital for the analysis of next-generation semiconductor devices.
• The new method offers a practical alternative for investigating non-magnetic materials without specialized lenses.