Patent ID: RE41509

Claim:
A high voltage vertical conduction superjunction semiconductor device comprising: a body of one conductivity type; a plurality of spaced vertical trenches formed into the upper surface of said body; diffusions including a diffusion of the an other conductivity type formed into the interior surface of each of said plurality of said trenches; a MOSgated structure connected to the top of said body and to the top of each of said diffusions; the thickness and concentration of said diffusion diffusions and the width and concentration of said body being matched to insure ensure substantially full depletion of said diffusion diffusions and body when blocking voltage is applied to said body; wherein said MOSgated structure comprises a base of the other conductivity type extending across the top of said body, a plurality of spaced source regions of the one conductivity type diffused into said base, a plurality of second trenches in the top of said base and between respective pairs of said trenches, a gate oxide lining the interior of said second trenches and a conductive polysilicon gate filling the interior of said second trenches; and a source contact formed on the top surface of said device and in contact with said base and with said source regions.