Patent ID: 11967637
Assignee: GLOBALFOUNDRIES U.S. INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. A method comprising:
forming a semiconductor fin having opposing sidewalls and a first width;
forming, in the semiconductor fin, collector and emitter recesses and a base recess positioned laterally between and separated from the collector and emitter recesses, wherein the base recess that extends across the first width through the opposing sidewalls; and
forming collector and emitter regions in the collector and emitter recesses, respectively, and a base region in the base recess,
wherein the base region includes
a base semiconductor layer on the semiconductor fin at least in the base recess, wherein the base semiconductor layer has a second width that is wider than the first width such that the base semiconductor layer extends laterally beyond the opposing sidewalls; and
an additional base semiconductor layer on the base semiconductor layer, and

wherein top surfaces of the collector and emitter regions are above a level of a top surface of the base semiconductor layer.