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

Claim 13:
14. A method of forming a structure for a lateral bipolar junction transistor, the method comprising:
forming a first terminal including a first raised semiconductor layer on a semiconductor substrate;
forming a second terminal including a second raised semiconductor layer on the semiconductor substrate; and
forming an intrinsic base including a first portion and a second portion, wherein the first portion of the intrinsic base is positioned on the semiconductor substrate in a lateral direction between the first raised semiconductor layer of the first terminal and the second raised semiconductor layer of the second terminal, and the second portion of the intrinsic base positioned in a vertical direction between the first portion of the intrinsic base and the semiconductor substrate, the first portion of the intrinsic base comprises silicon-germanium with a first germanium concentration that is graded in the lateral direction, 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.