Radio frequency performance projection and stability tradeoff of h-BN encapsulated graphene field-effect transistors
Feijoo, Pedro Carlos (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Pasadas, Francisco (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Iglesias, José M. (Universidad de Salamanca. Departamento de Física Aplicada)
Hamham, El Mokhtar (Universidad de Salamanca. Departamento de Física Aplicada)
Rengel, Raul (Universidad de Salamanca. Departamento de Física Aplicada)
Jiménez Jiménez, David (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)

Data:	2019
Resum:	Hexagonal boron nitride encapsulation significantly improves carrier transport in graphene. This paper investigates the benefit of implementing the encapsulation technique in graphene field-effect transistors (GFETs) in terms of their intrinsic radio frequency (RF) performance, adding the effect of the series resistances at the terminals. For such a purpose, a drift-diffusion self-consistent simulator is prepared to get the GFET electrical characteristics. Both the mobility and saturation velocity are obtained by an ensemble Monte Carlo simulator upon considering the relevant scattering mechanisms that affect carrier transport. RF figures of merit are simulated using an accurate small-signal model. Results reveal that the cutoff frequency could scale up to the physical limit given by the inverse of the transit time. Projected maximum oscillation frequencies, in the order of few terahertz, are expected to exceed the values demonstrated by InP and Si-based RF transistors. The existing tradeoff between power gain and stability and the role played by the gate resistance are also studied. High power gain and stability are feasible even if the device is operated far away from current saturation. Finally, the benefits of device unilateralization and the exploitation of the negative differential resistance region to get negative-resistance gain are discussed.
Ajuts:	European Commission 696656 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-384 Ministerio de Economía y Competitividad TEC2016-80839-P Ministerio de Economía y Competitividad TEC2015-67462-C2-1-R Ministerio de Economía y Competitividad FJCI-2014-19643
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Graphene field-effect transistors (GFETs) ; Hexagonal boron nitride (h-BN) encapsulated graphene ; Negative differential resistance (NDR) ; Radio frequency (RF) ; Stability
Publicat a:	IEEE Transactions on Electron Devices, Vol. 66, Issue 3 (March 2019) , p. 1567-1573, ISSN 0018-9383

DOI: 10.1109/TED.2018.2890192

Postprint 20 p, 736.9 KB

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