Patent ID: 11908898
Assignee: GLOBALFOUNDRIES U.S. INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A lateral bipolar transistor structure comprising:
an emitter/collector (E/C) layer on a semiconductor layer;
a first base layer on the semiconductor layer and horizontally adjacent the E/C layer and including:
an upper portion having a first horizontal width from the E/C layer,
a lower portion under the upper portion and having a second horizontal width from the E/C layer less than the first horizontal width, and
a sidewall adjacent the E/C layer including a concave surface; and

a second base layer on the first base layer and adjacent a spacer, wherein the upper portion of the first base layer separates a lower surface of the second base layer from the E/C layer.