Patent ID: 8836090
Filing Date: 2014-09-16
Classification: H01L

Abstract:
1. A power diode semiconductor die comprising: a first layer of N+ type semiconductor material; a metal cathode electrode disposed underneath the first layer; a second layer of N− type semiconductor material disposed over the first layer, wherein the second layer has an upper surface that extends in a plane; a P+ type region of P+ type semiconductor material, wherein the P+ type region extends down from the plane into the second layer such that N− type semiconductor material of the second layer laterally surrounds the P+ type region in a ring, wherein the ring of the N− type semiconductor material extends up to the plane, and wherein the P+ type region is formed such that a plurality of N− type mesas of the N− type semiconductor material of the second layer extend up to the plane within the ring so that each N− type mesa is laterally surrounded at the plane by a ring of the P+ type semiconductor material of the P+ type region; a plurality of features of an insulation layer, where each respective one of the plurality of N− type mesas is covered by a corresponding respective one of the plurality of the features; and a metal anode electrode disposed over the P+ type region such that the plurality of features of the insulation layer separate the N− type mesas from the metal anode electrode, wherein the power diode semiconductor die is operable as a high voltage power diode to conduct a forward current from the metal anode electrode, through the P+ type region, and to the metal cathode electrode.