Patent ID: 7301203

Claim:
A superjunction semiconductor device having an active region and a termination region surrounding the active region, a central vertical axis of a boundary column of a second conductivity type material defining the boundary between the active region and the termination region, wherein the active region and the termination region include columns of first conductivity type material and columns of second conductivity type material alternately arranged on both sides of the boundary column in a semiconductor region having top and bottom surfaces, wherein in the active region, a first conductivity type charge quantity in each of the columns of first conductivity type material is greater than a second conductivity type charge quantity in each of the columns of second conductivity type material, wherein a difference between a first conductivity type charge quantity within a first column of the first conductivity type material in the termination region adjoining the boundary column and the sum of a second conductivity type charge quantity in one half of the boundary column and one half of a second column of the second conductivity type material in the termination region adjoining the first column is less than the difference between a first conductivity type charge quantity within a third column of the first conductivity type material in the active region adjoining the boundary column and the sum of a second conductivity type charge quantity in one half of the boundary column and one half of a fourth column of the second conductivity type material in the active region adjoining the third column.