Patent ID: 11916136
Assignee: GLOBALFOUNDRIES U.S. INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A structure for a bipolar junction transistor, the structure comprising:
a semiconductor substrate;
a first terminal including a first raised semiconductor layer on the semiconductor substrate;
a second terminal including a second raised semiconductor layer on the semiconductor substrate; and
an intrinsic base including a first portion and a second portion, the first portion of the intrinsic base positioned in a lateral direction between the first raised semiconductor layer of the first terminal and the second raised semiconductor layer of the second terminal, the second portion of the intrinsic base positioned in a vertical direction between the first portion of the intrinsic base and the semiconductor substrate, and the first portion of the intrinsic base comprising silicon-germanium with a first germanium concentration that is graded in the lateral direction,
wherein the first portion of the intrinsic base and the second portion of the intrinsic base adjoin along an interface, and the first germanium concentration has a minimum value at the interface.