Patent ID: 11949025
Assignee: STMICROELECTRONICS S.R.L.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. A device, comprising:
a substrate of wide band gap semiconductor having a first conductivity type and a surface, the substrate including a drift region and a plurality of first implanted regions, the plurality of first implanted regions having a second conductivity type and extending in the drift region from the surface;
a vertical-conduction electronic power device in the substrate,
a plurality of first and second Schottky diodes having:
a plurality of metal portions on the surface, each metal portion of the plurality of metal portions being in Schottky contact with the drift region at a plurality of surface portions of the drift region, the first Schottky diodes have, at equilibrium, a Schottky barrier having a height different from the second Schottky diodes, each metal portion of the plurality of metal portions on one of the plurality of first implanted regions, each implanted region of the plurality of first implanted regions having an interface with the drift region, each metal portion of the plurality of metal portions having edges that are spaced from the interface of each implanted region of the plurality of first implanted regions with the drift region, each metal portion of the plurality of metal portions being in contact with a respective one of the plurality of first implanted regions and with the surface at the drift region, the plurality of metal portions includes:
a first layer of a first metal material patterned to form first metal portions in Schottky contact with first surface portions of the plurality of surface portions of the drift region; and
a second layer of a second metal material.