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oai:recercat.cat:2072/4384742026-03-13T05:43:22Zcom_2072_98col_2072_378192

GFET asymmetric transfer response analysis through access region resistances Toral-Lopez, Alejandro Marin, Enrique G. Pasadas, Francisco Gonzalez Medina, Jose Maria Garcia Ruiz, Francisco J. Jiménez, David Godoy Medina, Andres GFET RF Access region Graphene-based devices are planned to augment the functionality of Si and III-V based technology in radio-frequency (RF) electronics. The expectations in designing graphene field-effect transistors (GFETs) with enhanced RF performance have attracted significant experimental efforts, mainly concentrated on achieving high mobility samples. However, little attention has been paid, so far, to the role of the access regions in these devices. Here, we analyse in detail, via numerical simulations, how the GFET transfer response is severely impacted by these regions, showing that they play a significant role in the asymmetric saturated behaviour commonly observed in GFETs. We also investigate how the modulation of the access region conductivity (i.e., by the influence of a back gate) and the presence of imperfections in the graphene layer (e.g., charge puddles) affects the transfer response. The analysis is extended to assess the application of GFETs for RF applications, by evaluating their cut-off frequency. 2019 Article Agencia Estatal de Investigación TEC2017-89955-P Ministerio de Economía y Competitividad TEC2015-67462-C2-1-R Ministerio de Economía y Competitividad IJCI-2017-32297 Ministerio de Educación, Cultura y Deporte FPU16/04043 Ministerio de Educación, Cultura y Deporte FPU14/02579 European Commission 785219 Nanomaterials ; Vol. 9, Issue 7 (July 2019), art. 1027 open access Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. https://creativecommons.org/licenses/by/4.0/