Moldovan, Clara F.Vitale, Wolfgang A.Sharma, PankajTamagnone, MicheleMosig, Juan R.Ionescu, Adrian M.2016-10-172016-10-172016-10-17201610.1021/acs.nanolett.5b05235https://infoscience.epfl.ch/handle/20.500.14299/129784WOS:000381331900003Graphene 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.graphenequantum capacitanceCVDRFtunable capacitorstext::journal::journal article::research article