Patent ID: 9024381
Filing Date: 2015-05-05
Classification: H01L

Abstract:
1. A semiconductor device having a super junction structure, the semiconductor device comprising: a substrate; and a super junction area which is disposed above the substrate and comprises first doping type pillars and second doping type pillars, which are alternately disposed, wherein one of the first doping type pillars of the super junction area has a doping concentration which gradually decreases from a bottom of the pillar to an area of lowest concentration and then gradually increases to a top of the pillar in a vertical direction of the substrate; one of the second doping type pillars has a substantially constant doping concentration from a top of the pillar to a bottom of the pillar in the vertical direction; and a magnitude of electric field in the semiconductor device gradually decreases from an area of maximum magnitude in an upper area of the one of the first doping type pillars to an area of lowest magnitude and gradually increases from the area of lowest magnitude to an area of maximum magnitude in a lower area of the pillar in the vertical direction, such that a distance from the area of maximum magnitude in the upper area to the area of lowest magnitude is greater than a distance from the area of lowest magnitude to the area of maximum magnitude in the lower area of the pillar.