Patent ID: 11881395
Assignee: GLOBALFOUNDRIES U.S. INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A bipolar transistor structure comprising:
a triple well stack, including:
a deep well region,
a substrate portion over the deep well region, and
a doped semiconductor layer over the substrate portion and coupled to a base contact, wherein the deep well region has a same doping type as the doped semiconductor layer;

a first semiconductor fin on the doped semiconductor layer of the triple well stack, the first semiconductor fin having a first doping type;
an emitter/collector (E/C) material on a sidewall of an upper portion of the first semiconductor fin, the E/C material having a second doping type opposite the first doping type, wherein the E/C material is coupled to an E/C contact, wherein a lateral width of the E/C material from an outside surface of the E/C material to the sidewall of the first semiconductor fin is greater than a lateral width of the first semiconductor fin; and
a second semiconductor fin on the doped semiconductor layer of the triple well stack and below the base contact, wherein the second semiconductor fin extends vertically continuously from the doped semiconductor layer of the triple well stack to the base contact, and an upper surface of the second semiconductor fin physically contacts a lower surface of the base contact.