Patent ID: 11888031
Assignee: GLOBALFOUNDRIES U.S. INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A structure comprising:
an isolation layer;
a heterojunction bipolar transistor comprising:
a base comprising a semiconductor fin having a first portion extending through the isolation layer, a second portion on the first portion, and a third portion on the second portion, wherein the isolation layer is positioned laterally immediately adjacent to opposing sidewalls of the first portion, wherein the first portion and the third portion comprise a first semiconductor material, and wherein at least one section of the second portion comprises a second semiconductor material that is different from the first semiconductor material; and
a collector and an emitter above the isolation layer and positioned laterally immediately adjacent to opposing sidewalls, respectively, of the second portion; and

a dielectric layer on the collector and the emitter and further positioned laterally immediately adjacent to and covering opposing sidewalls of the third portion.