METHOD OF FORMING A SEMICONDUCTOR DEVICE

摘要

A method for forming a semiconductor device includes providing a semiconductor substrate (12) having a first doped region and a second doped region, providing a dielectric (14) over the first doped region and the second doped region, and forming a first gate stack (26) over the dielectric over at least a portion of the first doped region. The first gate stack includes a metal portion (18) over the dielectric, a first in situ doped semiconductor portion (22) over the metal portion, and a first blocking cap (23) over the in situ doped semiconductor portion. The method further includes performing an implant to form source/drain regions adjacent the first gate stack, where the first blocking cap has a thickness sufficient to substantially block dopants from the implant from entering the first in situ doped semiconductor portion.