Patent ID: 8106453

Claim:
A semiconductor device having a super junction structure comprising: a plurality of first columns having a first conductive type and extending in a current flowing direction; and a plurality of second columns having a second conductive type and extending in the current flowing direction, wherein the first columns and the second columns are alternately arranged in an alternating direction perpendicular to the current flowing direction so that the super junction structure is provided, each first column provides a drift layer in case of an on-state for flowing a current therethrough, the first columns and the second columns have a boundary between the first column and the second column, from which a depletion layer expands in case of an off-state, at least one of the first columns and the second columns have an impurity dose, which is inhomogeneous by location with respect to the alternating direction, each first column has a first impurity concentration, each second column has a second impurity concentration, the first impurity concentration of one first column is different from the first impurity concentration of an adjacent first column, the second impurity concentration of one second column is different from the second impurity concentration of an adjacent second column, the first impurity concentration is homogeneous in each first column, and the second impurity concentration is homogeneous in each second column.