Method for increasing the carrier mobility in the channel of the 4H-SiC MOSFET

A new method is suggested for increasing the carrier mobility in the channel of a field-effect transistor based on silicon carbide of the 4H polytype via the oxidation of a bilayer system constituted by a thin layer of silicon nitride and a silicon-dioxide layer. Together with increasing carrier mobility, the average breakdown field strength decreases as compared with the gate insulator thermally grown in an atmosphere of N2O.