Measurements of dislocations in 4H-SiC with rocking curve imaging

Abstract

4H Silicon Carbide (4H-SiC) combines many attractive properties such as a high carrier mobility, a wide bandgap, and a high thermal conductivity, making it an ideal candidate for high-power electronic devices. However, a primary challenge in utilizing 4H-SiC is the presence of defects in epitaxial layers, which can significantly degrade device performance. In this study, we have used X-ray transmission topography with a rocking curve imaging technique to characterize the types and distribution of defects in 4H-SiC. The derived maps from the fitted Gaussian parameters were used to investigate dislocations in 4H-SiC. Understanding the distribution of the dislocations provides valuable insights into the overall crystal quality, which can guide improvements for the fabrication processes.