A semiconductor device with improved source/drain junctions and methods
for fabricating the device are disclosed. A preferred embodiment
comprises a MOS transistor with a gate structure overlying a substrate,
lightly doped source/drain regions formed in the substrate aligned to the
gate structure, sidewall spacers formed on the sidewalls of the gate
structure and overlying the lightly doped source/drain regions, deeper
source/drain diffusions formed into the substrate aligned to the sidewall
spacers and additional pocket implants of source/drain dopants formed at
the boundary of the deeper source/drain diffusions and the substrate. In
a preferred method, the additional pocket implants are formed using an
angled ion implant with the angle being between 4 and 45 degrees from
vertical. Additional embodiments include recesses formed in the
source/drain regions and methods for forming the recesses.