Patent ID: 11862735
Assignee: GLOBALFOUNDRIES SINGAPORE PTE. LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 17:
18. A method of forming an electrostatic discharge (ESD) protection device comprising:
providing a substrate including a bi-polar junction transistor arranged in the substrate, including:
providing a first doped region, a second doped region, and a third doped region, the second doped region disposed between the first and third doped regions, wherein the second doped region is of a first conductivity type and a first doping concentration and the first and third doped regions are of a second conductivity type and a second doping concentration;
providing a first doped terminal region disposed within the first doped region;
providing a second doped terminal region disposed within the third doped region; and
providing a doped island region disposed within the second doped region, wherein the first doped terminal region, second doped terminal region and doped island region are of the second conductivity type and a third doping concentration, the third doping concentration being higher than the first doping concentration and the second doping concentration; and
providing a first conductive terminal coupled to the first doped terminal region;
providing a second conductive terminal coupled to the second doped terminal region; and
providing an insulating layer arranged on the substrate between the first and second conductive terminals, the insulating layer covering at least the second doped region,
wherein the first doped region and the third doped region are spaced apart from each other,
wherein a depth of the first doped region is substantially the same as a depth of the third doped region, and a depth of the second doped region is less than the depth of the first and third doped regions,
wherein a first sidewall of the second doped region abuts the first doped region and a second sidewall of the second doped region abuts the third doped region, and
wherein the second doped region overlaps at least a portion of the first doped region and overlaps at least a portion of the third doped region.