Patent ID: 6576935
Filing Date: 2003-06-10
Classification: H01L

Abstract:
A bidirectional semiconductor device comprising:a first major surface; a second major surface; an alternating conductivity type layer between the first major surface and the second major surface, the alternating conductivity type layer including drift regions of a first conductivity type and partition regions of a second conductivity type; a first MIS-type device region on a first side of the alternating conductivity type layer; and a second MIS-type device region on a second side of the alternating conductivity type layer facing opposite to the first side, wherein the first MIS-type device region has a third region of the first conductivity type and a plurality of first base regions of the second conductivity type; and wherein the second MIS-type device region has a fourth region of the first conductivity type and a plurality of second base regions of the second conductivity type, wherein each of the first base regions has a first source region of the first conductivity type, wherein each of the second base regions has a second source region of the first conductivity type, wherein the third region and the fourth region are connected to each other by the drift regions, wherein the third region isolates the first base region from the partition regions, wherein the fourth region isolates the second base region from the partition regions, wherein the third region and the fourth region include respective sub-regions on the side of the respective corresponding major surfaces, and wherein a net impurity concentrations in the respective sub-regions are higher than a net impurity concentration in the drift regions.