Patent ID: 6118149
Filing Date: 2000-09-12
Classification: H01L

Abstract:
A semiconductor device comprising:a drain electrode;a drain layer of a second conductivity type formed on said drain electrode;a high-resistance layer of the second conductivity type formed on said drain layer of the second conductivity type, said high-resistance layer of the second conductivity type having a resistance higher than that of said drain layer of the second conductivity type;base layers of a first conductivity type selectively formed in said high-resistance layer of the second conductivity type and disposed approximately in parallel to each other;source layers of the second conductivity type selectively formed in the surface of said base layers of the first conductivity type and disposed approximately parallel to each other;a source electrode formed on said source layers of the second conductivity type; andgate electrodes formed in a buried state through gate insulation films in a plurality of trenches formed, and in the surface portion between said source layers of the second conductivity type through base layers of the first conductivity type and into said high-resistance layer of the second conductivity type, said trenches extending to an intermediate depth of said high-resistance layer of the second conductivity type;wherein said trenches each have a surface longitudinal shape extending in a direction approximately perpendicular to that of said source layers of the second conductivity type.