Patent ID: 11888061
Assignee: INFINEON TECHNOLOGIES DRESDEN GMBH & CO. KG
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A power semiconductor device, comprising:
a semiconductor body having a surface;
a control electrode arranged at least partially on or inside the semiconductor body and configured to control a load current in the semiconductor body;
a plurality of elevated source regions of a first conductivity type arranged in the semiconductor body adjacent to the control electrode;
a plurality of recessed body regions arranged adjacent to the elevated source regions; and
a dielectric layer arranged on a portion of the surface of the semiconductor body and defining a contact hole, the contact hole being at least partially filled with a conductive material that establishes an electrical contact with at least a portion of the elevated source regions and at least a portion of the recessed body regions,
wherein at least one first contact surface between at least one of the elevated source regions and the dielectric layer extends in a first horizontal plane and at least one second contact surface between at least one of the recessed body regions and the dielectric layer extends in a second horizontal plane, the second horizontal plane being located vertically below the first horizontal plane,
wherein at a first lateral transition between each elevated source region and an adjacent recessed body region, the surface of the semiconductor body exhibits a first step,
wherein each first step extends in parallel with a main lateral extension direction of the control electrode,
wherein at a second lateral transition between the elevated source regions and portions of the recessed body regions that extend between the elevated source regions, the surface of the semiconductor body exhibits a second step,
wherein each second step is orthogonal to the main lateral extension direction of the control electrode.