Patent ID: 11961904
Assignee: INFINEON TECHNOLOGIES AG
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method of manufacturing a semiconductor device, the method comprising:
implanting first dopants through a first surface section, exposed by an implant mask opening, of a first surface of a silicon carbide body;
forming a trench extending from the first surface, through which the first dopants were implanted, into the silicon carbide body, wherein the trench comprises a first sidewall surface and an opposite second sidewall surface;
forming a spacer mask covering at least the first sidewall surface;
implanting second dopants through a portion of a bottom surface of the trench exposed by the spacer mask, wherein the first dopants and the second dopants have a same conductivity type; and
activating the first dopants and the second dopants, wherein:
the first dopants form a doped top shielding region adjoining the second sidewall surface; and
the second dopants form a doped buried shielding region adjoining the bottom surface,

wherein at least one of:
a second doped top shielding region does not adjoin the first sidewall surface;
the doped top shielding region adjoins a majority of a portion of the second sidewall surface adjoining the silicon carbide body; or
the method comprises forming a gate electrode between the first sidewall surface and the second sidewall surface adjoining the doped top shielding region.