Graphene FETs with Low-Resistance Hybrid Contacts for Improved High Frequency Performance

Authors

Chowdhury Al-Amin, Department of Electrical and Computer Engineering, Florida International UniversityFollow
Mustafa Karabiyik, Department of Electrical and Computer Engineering, Florida International UniversityFollow
Phani Kiran Vabbina, Deparetment of Electrical and Computer Engineering, Florida International UniversityFollow
Raju Sinha, Department of Electrical and Computer Engineering, Florida International UniversityFollow
Nezih Pala, Deparetment of Electrical and Computer Engineering, Florida International UniversityFollow

Date of this Version

5-10-2016

Document Type

Article

Abstract

This work proposes a novel geometry field effect transistor with graphene as a channel—graphene field-effect transistor (GFET), having a hybrid contact that consists of an ohmic source/drain and its extended part towards the gate, which is capacitively coupled to the channel. The ohmic contacts are used for direct current (DC) biasing, whereas their capacitive extension reduces access region length and provides the radio frequency (RF) signal a low impedance path. Minimization of the access region length, along with the paralleling of ohmic contact’s resistance and resistive part of capacitively coupled contact’s impedance, lower the overall source/drain resistance, which results in an increase in current gain cut-off frequency, fT. The DC and high-frequency characteristics of the two chosen conventional baseline GFETs, and their modified versions with proposed hybrid contacts, have been extensively studied, compared, and analyzed using numerical and analytical techniques.

Comments

Originally published in Nanomaterials.

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 License.

Recommended Citation

Al-Amin, C.; Karabiyik, M.; Vabbina, P.K.; Sinha, R.; Pala, N. Graphene FETs with Low-Resistance Hybrid Contacts for Improved High Frequency Performance. Nanomaterials 2016, 6, 86.