Patent ID: 11935928
Assignee: GLOBALFOUNDRIES U.S. INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. A structure comprising:
an extrinsic base formed over a semiconductor on insulator substrate;
an asymmetrical spacer comprising a vertical sidewall directly contacting a first sidewall of the extrinsic base and an L-shaped sidewall directly contacting another sidewall of the extrinsic base;
an emitter separated from the extrinsic base by the vertical sidewall of the asymmetrical spacer; and
a collector separated from the extrinsic base by the L-shaped sidewall of the asymmetrical spacer,
wherein the asymmetrical spacer is a single spacer which surrounds the extrinsic base, wherein the vertical sidewall is adjacent to the emitter and the L-shaped sidewall is adjacent to the collector.