Patent ID: 11869771
Assignee: STMICROELECTRONICS S.R.L.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A device, comprising:
a semiconductor body including a substrate having a first doping type and a drift layer on the substrate, the drift layer having a second doping type different than the first doping type;
a metallization layer on the drift layer;
an active area of the drift layer in contact with and covered by the metallization layer, the active area including:
one or more doped regions in the drift layer, the one or more doped regions are at a first surface of the drift layer facing away from the substrate, the one or more doped regions are junction-barrier (JB) elements; and
one or more Schottky diodes are at one or more interface regions between the drift layer and the metallization layer, each respective interface region of the one or more interface regions is adjacent to a corresponding doped region of the one or more doped regions;

a first anchorage element of a passivation layer that protrudes into the first surface of the drift layer of the semiconductor body, the passivation layer extends on the first surface of the drift layer of the semiconductor body and protrudes into a first cavity in the drift layer of the semiconductor body and the first surface, and the first anchorage element includes:
a first portion in the drift layer at a first distance from the first surface in a first direction transverse to the first surface, and the first portion having a first dimension in a second direction transverse to the first direction; and
a second portion being superimposed with the first portion, extending into the drift layer from the first surface of the drift layer to the first portion in the first direction, and having a second dimension in the second direction smaller than the first dimension, the second portion being closer to the first surface than the first portion,
wherein the first anchorage element fixes the passivation layer to the drift layer of the semiconductor body; and

a protection ring in the drift layer, the protection ring having a third doping type different from the first doping type and different from the second doping type, the protection ring is between the active area and the first anchorage element, and the protection ring is spaced apart from the one or more doped regions and is spaced apart from the anchorage element.