Patent ID: 11901414
Assignee: NXP B.V.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. A method for forming a bipolar transistor device, the method comprising:
forming a semiconductor substrate;
forming a collector region within the semiconductor substrate, wherein forming the collector region includes forming a first doped region in a lower portion of the collector region, forming a second doped region over the first doped region in an upper portion of the collector region, and forming a defect region between the first doped region and the second doped region wherein the first doped region has a dopant concentration higher than a dopant concentration of the second doped region, and wherein forming the collector region includes forming a spacer region under the base region, between a collector sidewall and the first doped region and the second doped region, wherein a dopant concentration of the spacer region is lower than a dopant concentration of the second doped region;
forming a base region formed over the collector region; and
forming an emitter region formed over the base region.