[Calculation of dislocation destiny using X-ray diffraction for 4H-SiC homoepitaxial layers]

Area of Science:

• Materials Science
• Solid State Physics
• Crystallography

Context:

• High dislocation density in 4H-SiC (4H-Silicon Carbide) homoepitaxial layers complicates accurate measurement.
• X-ray diffraction (XRD) is a crucial technique for material characterization, but its accuracy is affected by defect concentrations.

Purpose:

• To develop and validate a theoretical and experimental approach for determining dislocation density in 4H-SiC.
• To establish a quantitative relationship between dislocation density and X-ray diffraction peak broadening (FWHM spread).
• To analyze the origins of dislocations and propose methods for their reduction.

Summary:

• A theoretical model correlates dislocation density with FWHM spread in XRD patterns.
• Experimental XRD data from two crystal faces of 4H-SiC were analyzed to calculate dislocation density.
• The study identifies dislocation origins and suggests strategies for minimizing defect density.

Impact:

• Provides a more reliable method for quantifying dislocations in 4H-SiC, crucial for device performance.
• Offers insights into defect formation mechanisms in SiC epitaxy.
• Contributes to improving the quality and yield of SiC-based electronic devices.