Patent ID: 8558309
Filing Date: 2013-10-15
Classification: H01L

Abstract:
1. A semiconductor device including a power MISFET having a super junction structure, comprising: a semiconductor substrate; an n-type layer formed over the semiconductor substrate; first and second p-type impurity regions formed in the semiconductor substrate; a first p-type column extending in a first direction in a plan view, formed in the n-type layer and arranged under the first p-type impurity region; a second p-type column extending in the first direction in the plan view, formed in the n-type layer and arranged under the second p-type impurity region; a third p-type column extending in the first direction in the plan view, formed in the n-type layer and arranged under the second p-type impurity region; a first groove formed in the first p-type impurity region, such that a bottom of the first groove is arranged in first p-type impurity region and is arranged over the first p-type column; a second groove formed in the second p-type impurity region, such that a bottom of the second groove is arranged in second p-type impurity region and is arranged over the second p-type column; a first n-type impurity region formed in the first p-type impurity region and exposed at a side wall of the first groove; a second n-type impurity region formed in the second p-type impurity region and exposed at a side wall of the second groove; a gate electrode formed over the n-type layer and arranged between the first and second columns and between the first and second n-type impurity regions in the plan view; a first insulating film formed over the gate electrode; and a source electrode formed over the gate electrode through the first insulating film, embedded in the first and second grooves, and electrically connected to the first and second p-type impurity regions and the first and second n-type impurity regions, wherein the third p-type column is arranged between the second p-type column and an edge of the semiconductor substrate in a second direction perpendicular to the first direction in the plan view, and wherein, in the second direction, a width of the third p-type column is larger than a width of the first p-type column and is larger than a width of the second p-type column.