Patent ID: 7691734

Claim:
A method of manufacturing a semiconductor structure, comprising: forming a far subcollector in a semiconductor substrate, wherein said far subcollector is doped with dopants of one conductivity type; forming at least one deep trench in said semiconductor substrate, wherein said at least one deep trench adjoins said far subcollector; depositing a dielectric layer on walls of said at least one deep trench; patterning said dielectric layer, wherein a portion of said dielectric layer is removed from inside said at least one deep trench to expose a sidewall of said at least one deep trench while another portion of said dielectric layer remains on another sidewall of said at least one deep trench; forming a reachthrough region on and outside a wall of said at least one deep trench and within said semiconductor substrate, wherein said reachthrough region is doped with dopants of said one conductivity type and abuts said far subcollector; forming a doped fill material within said at least one deep trench and doped with dopants of said one conductivity type, wherein said doped fill material abuts said reachthrough region; and forming a metal contact directly on said doped fill material.