title: Graphene Quantum Capacitors for High Frequency Tunable Analog Applications.
abstract: Graphene quantum capacitors (GQC) are demonstrated to be enablers of radio-frequency (RF) functions through voltage-tuning of their capacitance. We show that GQC complements MEMS and MOSFETs in terms of performance for high frequency analog applications and tunability. We propose a CMOS compatible fabrication process and report the first experimental assessment of their performance at microwaves frequencies (up to 10 GHz), demonstrating experimental GQCs in the pF range with a tuning ratio of 1.34:1 within 1.25 V, and Q-factors up to 12 at 1 GHz. The figures of merit of graphene variable capacitors are studied in detail from 150 to 350 K. Furthermore, we describe a systematic, graphene specific approach to optimize their performance and predict the figures of merit achieved if such a methodology is applied.
authors.affiliation: Nanoelectronics Devices Laboratory and ‡Laboratory of Electromagnetics and Antennas, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland.
authors.forename: Clara F
authors.initials: CF
authors.lastname: Moldovan
authors.affiliation: Nanoelectronics Devices Laboratory and ‡Laboratory of Electromagnetics and Antennas, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland.
authors.forename: Wolfgang A
authors.initials: WA
authors.lastname: Vitale
authors.affiliation: Nanoelectronics Devices Laboratory and ‡Laboratory of Electromagnetics and Antennas, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland.
authors.forename: Pankaj
authors.initials: P
authors.lastname: Sharma
authors.affiliation: Nanoelectronics Devices Laboratory and ‡Laboratory of Electromagnetics and Antennas, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland.
authors.forename: Michele
authors.initials: M
authors.lastname: Tamagnone
authors.affiliation: Nanoelectronics Devices Laboratory and ‡Laboratory of Electromagnetics and Antennas, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland.
authors.forename: Juan R
authors.initials: JR
authors.lastname: Mosig
authors.affiliation: Nanoelectronics Devices Laboratory and ‡Laboratory of Electromagnetics and Antennas, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland.
authors.forename: Adrian M
authors.initials: AM
authors.lastname: Ionescu
keywords: CVD; RF; graphene; quantum capacitance; tunable capacitors