Series Resistance and Mobility Extraction Method in Nanoscale MOSFETs

This paper presents a BSIM-based method for source/drain series resistance and mobility extraction in nanoscale strained-silicon metal oxide semiconductor field effect transistors (MOSFETs) with halo implants. This method is more accurate than the conventional channel-resistance and shift and ratio method because it considers the gate-length dependence of mobility caused by local uniaxial stress and laterally nonuniform channel doping. We have verified this method using samples with different stressor/doping conditions and good agreement with experimental data has been obtained. The accuracy of the Berkeley Short-channel IGFET model (BSIM) R-sd extraction method is also proven by simulated current-voltage characteristics with different external resistant values. Significant mobility degradation in the short-channel regime has been observed for various uniaxial stressors. This method may serve as a suitable process monitor tool for ultrashallow junction and strained process development.