Novel Nitrogen Doped Ni Self-Alingned Silicide Process for Nanoscale Complementary Metal Oxide Semiconductor Technology

Abstract

In this paper, 1%-nitrogen doped nickel was proposed to improve the thermal stability of Ni-silicide for nano-scale N-type Metal Oxide Semiconductor Field Effect Transistor. It is shown that thermal stability of nickel silicide is improved a lot by the Nitrogen incorporation in NiSi layer using the 1%-nitrogen doped nickel target. Even after post-silicidation annealing at 650°C for 30 min, the low resistivity NiSi with low junction leakage current can be achieved. Moreover, improved device characteristics such as threshold voltage, transconductance, and on-off current, subthreshold slope were obtained in 80 nm NMOSFET.