Formation mechanism of concave by dielectric breakdown on silicon carbide metal-oxide-semiconductor capacitor
A model is proposed to explain how concaves are formed by dielectric breakdown. The concaves are commonly formed after the breakdown of SiC MOS capacitors. On the concave surface, C-rich layer containing graphite is formed on Si-rich layer. In this model, decomposed SiC by the joule heat forms the Si-rich layer. The C-rich layer is formed by normal freezing or further thermal decomposition.
concaves silicon carbide graphite normal freezing decomposition tddb