A calcium doped polysilicon gate electrodes for PMOS containing semiconductor
devices.
The calcium doped PMOS gate electrodes reduce migration of the boron dopant out
of the gate electrode, through the gate dielectric and into the substrate thereby
reducing the boron penetration problem increasingly encountered with smaller device
size regimes and their thinner gate dielectrics. Calcium doping of the gate electrode
may be achieved by a variety of techniques. It is further believed that the calcium
doping may improve the boron dopant activation in the gate electrode, thereby further
improving performance.