Correlation Between the Electric Field and the Negative Temperature Bias Instabilities Degradation in Junctionless Nanowire Transistors

Abstract

In this work, we have correlated the degradation by Negative Bias Temperature Instability (NBTI) in MOS Junctionless Nanowire Transistors (JNTs) to the electric field inside the devices. We have measured samples with doping concentrations of $1\times 10^{19} cm^{-3}$, biased at two different drain voltages, with several channel lengths (L) and widths (W). To extend the analysis, aiming at the understanding the physical behavior of the devices, we performed simulations of NBTI considering devices with similar characteristics. As a result, a higher degradation by the NBTI effect was obtained for the JNTs with lower doping concentration and shorter channel. The behavior of the NBTI has been correlated to the electric field of the devices and it is shown that the electric field becomes important mainly in accumulation regime.