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A novel planar accumulation channel SiC MOSFET structure is reported in this paper. The problems of gate oxide rupture and poor channel conductance previously reported in SiC UMOSFETs are solved by using a buried P/sup +/ layer to shield the channel region. The fabricated 6H-SiC unterminated devices had a blocking voltage of 350 V with a specific on-resistance of 18 m/spl Omega/.cm/sup 2/ at room temperature for a gate bias of only 5 V. This measured specific on-resistance is within 2.5/spl times/ of the value calculated for the epitaxial drift region (10/sup 16/ cm/sup -3/, 10 /spl mu/m), which is capable of supporting 1500 V.
Date of Publication: Dec. 1997