Two-dimensional Kikuchi patterns of Si as measured using an electrostatic analyser

Area of Science:

• Materials Science
• Solid State Physics
• Crystallography

Background:

• Kikuchi patterns are crucial for analyzing crystal structures using electron diffraction.
• Conventional electron backscatter diffraction (EBSD) and electron channeling patterns (ECP) lack precise energy resolution.
• Understanding Kikuchi pattern formation aids in interpreting these conventional techniques.

Purpose of the Study:

• To precisely measure Kikuchi patterns of silicon single crystals with sub-eV energy resolution.
• To validate a new method for detailed comparison of calculated and measured Kikuchi patterns.
• To investigate the influence of channeling and energy loss on Kikuchi pattern formation.

Main Methods:

• Utilizing an electrostatic analyzer for high-precision kinetic energy measurement of diffracted electrons.
• Acquiring two-dimensional Kikuchi patterns by rotating the silicon crystal under computer control.
• Comparing experimental measurements with theoretical calculations for validation.

Main Results:

• Detailed comparison between measured and calculated Kikuchi patterns for silicon.
• Identification of the influence of incoming beam channeling on Kikuchi patterns.
• Establishment of the effect of energy loss on Kikuchi patterns, with distinct behavior for channeling features versus Kikuchi lines.

Conclusions:

• The developed method allows for precise analysis of Kikuchi patterns and electron scattering.
• This research provides deeper insights into Kikuchi pattern formation mechanisms.
• The findings enhance the interpretation of conventional EBSD and ECP analyses by elucidating energy-dependent effects.