Patent ID: 7138669
Filing Date: 2006-11-21
Classification: H01H,H01L

Abstract:
1. A semiconductor layer for use in a bipolar transistor, said semiconductor layer comprising: carbon atoms; and a first ion-implanted doped region that comprises less than all of said semiconductor layer and comprises a dopant interacting with said carbon atoms, wherein said first ion-implanted doped region extends through said semiconductor layer is aligned above a second ion-implanted doped region in a second semiconductor layer, wherein said carbon atoms limit outdiffusion of said dopant to physically limit a size of said doped region within said semiconductor layer, wherein said dopant is included at a predetermined peak concentration, and wherein a combination of said size of said first ion-implanted doped region and said concentration of said dopant is sufficient to reduce a resistance of said semiconductor layer to less than approximately 4 Kohms/cm