Simulation Study of Vertically Stacked Lateral Si Nanowires Transistors for 5-nm CMOS Applications

Abstract

In this paper, we present a simulation study of vertically stacked lateral nanowires transistors (NWTs), which may have applications at 5-nm CMOS technology. Our simulation approach is based on a collection of simulation techniques to capture the complexity in such ultra-scaled devices. Initially, we used drift-diffusion methodology with activated Poisson-Schrodinger quantum corrections to accurately capture the quantum confinement in the cross-section of the device. Ensemble Monte Carlo simulations are used to accurately evaluate the drive current capturing the complexity of the carrier transport in the NWTs. We compared the current flow in single, double, and triple vertically stacked lateral NWTs with and without contact resistance. The results presented here suggest a consistent link between channel strain and device performance. Furthermore, we propose a device structure for the 5-nm CMOS technology node that meets the required industry scaling projection. We also consider the interplay between various sources of statistical variability and reliability in this paper.

Keywords

• Nanowire transistor
• TCAD
• Monte Carlo
• vertically stacked