Device design guideline for steep slope ferroelectric FET using negative capacitance in sub-0.2V operation: Operation speed, material requirement and energy efficiency

Abstract

We have shown a practical device design guideline for sub-0.2V ultra-low power, steep slope ferroelectric FET using negative capacitance (NC) focusing on operation speed, material requirement, and energy efficiency for the first time. The operation speed is determined by finite switching time of ferroelectric polarization. For low supply voltage and hysteresis-free design, there exists a ferroelectric material parameter window to maximize the benefit of steep slope by NC. By the optimized device design, the energy efficiency is improved by 2.5x. The minimum energy voltage is pushed down to sub-0.2V range.