Necessary conditions for steep switching in a constant Resistor-Capacitor RCFET

Abstract

We establish that the phenomenon of transient negative capacitance, conventionally linked to the delay in the response of a domain switching, of a ferroelectric material, and modelled by a non-linear capacitor, can in fact be considered to be more generally applicable to any phenomenon that can be represented by an RC-equivalent circuit. We demonstrate the conditions for sub-60 mV/dec switching in an RC-FET, even if the R and C were constant along both forward and backward sweeps. For semiconductor charge Qch, we show that the necessary condition for sub-60 mV/dec switching (dQch)/(dΨs) = (q/(kBT))Qch, where Ψs is the surface potential, is possible only if Qch > 0 (i.e. when the transistor is ON) during the backward sweep. This insight contributes further understanding on the causes of hysteresis in commonly used SPICE models of FE-FETs.

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Item Type:	Article
Authors/Creators:	Kumar, A. Song, X. De Souza, M.M. https://orcid.org/0000-0002-7804-7154
Copyright, Publisher and Additional Information:	© The Author(s) 2021. Open Access: This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Dates:	Published: August 2021 Published (online): 12 August 2021 Accepted: 30 July 2021
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield)
Depositing User:	Symplectic Sheffield
Date Deposited:	18 Aug 2021 12:42
Last Modified:	10 Mar 2022 09:51
Status:	Published
Publisher:	Springer Nature
Refereed:	Yes
Identification Number:	10.1557/s43580-021-00119-9
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:177213

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Necessary conditions for steep switching in a constant Resistor-Capacitor RCFET

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