Homoepitaxial Growth of 4H-SiC on On-Axis Si-Face Substrates Using Chloride-Based CVD

The homoepitaxial chloride-based CVD growth is demonstrated on Si-face on-axis 4H-SiC substrates. The use of chloride-based CVD has allowed growth of 100% 4H-SiC epitaxial layers with a growth rate of 20µm/h, thus about seven times higher than with standard precursors. It was also found that chlorine etches preferentially the 3C-SiC inclusions that tends to nucleate on Si-face on-axis substrates. Therefore the Cl/Si ratio is a fundamental process parameter to optimize.