Modeling and performance evaluation of UTB SGOI devices scalable to 22 nm technology node

• Authors: Kiran Bailey;K. S. Gurumurthy
• Venue: WSEAS Transactions on Circuits and Systems
• Year: 2010

There is a limit for classical CMOS devices' scaling. So to keep the Moore's law in force, attempts are being made to explore the possibility of designing newer devices. These attempts are in the direction of optimizing the design for high performance and low power applications. Silicon-Germanium on Insulator (SGOI) MOSFET is one such device which has got a bright future. An Attempt has been made in this paper to design 2D SGOI MOSFET using a commercial Technology CAD (TCAD) tool. Development of SGOI based Ultra thin Body (UTB) MOSFETs are proposed in this work. Device Simulations were performed for various Gate lengths, Body thicknesses, Anti punch doping and Si cap layer doping. It was found that, for a given body thickness and gate length, increasing the Silicon cap doping and anti-punch doping, the transconductance remains unchanged while Ioff, Drain Induced Barrier lowering (DIBL), Subthreshold slope and threshold voltages show improvement. Also, the devices with gate lengths 45nm, 32nm and 22nm demonstrate very good performance such as low leakage currents and good on current that are comparable to ITRS and hence can be implemented for sub-30 nm gate length devices. Device doping profiles have been optimized for the 22nm gate length CMOS devices to obtain minimum leakage and minimum static power dissipation. The performance of these devices has been evaluated by incorporating them in a Ring Oscillator and analyzing the circuit for static power dissipation and delay. The Ring oscillator consists of 3 inverter stages and with each inverter stage having a lumped capacitance of 6 MOSFETs.