Memoryless non‐linearity in B‐Substitution doped and undoped graphene FETs: A comparative investigation

Abstract

An accurate electrical equivalent circuit model for boron-substitution doped graphene field effect transistor (GFET) is proposed to analyse the effects of memoryless nonlinearity on transconductance. The proposed equivalent circuit model is verified with the simulated results of an industry-standard circuit simulation tool. The fundamental figures of merit (FOMs), such as the second-and third-order harmonic distortion terms (HD 2 and HD 3), gain compression point (A in,1dB), second-and third-order intermodulation distortion terms (IM 2 and IM 3), and second-and third-order input intercept points (A IIP2 and A IIP3) are mathematically modelled for B-substitution doped GFET to examine the linear behaviour of the device. The expressions are validated by performing the single tone and double tone simulation test to the proposed equivalent circuit model using the industry-standard circuit simulator. The proposed model is compatible and predicts accurate results for both B-substitution doped and undoped GFET. The simulation results are having an excellent agreement with the mathematical model, which are also compared with the undoped GFET and conventional MOSFET. It is also observed that by Bsubstitution doping the graphene sheet significantly induces the bandgapt and hence enhances the linear behaviour of the B-substitution doped GFET and promises highly desirable linearity requirement in the analog/RF applications. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

A recurrence model capturing interface traps for non-zero bandgap GFETs towards dynamic mimicking of synaptic plasticity

“…However, these devices are mostly based on the concept of undoped GFET. Moreover, as already reported [28][29][30], the undoped GFET suffers from many undesirable effects such as ambipolar behaviour and due to its zero bandgap, it is very hard to switch off the transistor. In contrast, B/N substitution doped GFETs with non-zero bandgap have already proven their noteworthiness over the undoped case by predicting improved saturation characteristics and suppressed ambipolar behaviour with significant reduction in the OFF-state current leading to higher ON-OFF ratio (I ON /I OFF ), making the device desirable for digital and analogue applications.…”