Graphene Quantum Capacitors for High Frequency Tunable Analog Applications

Graphene Quantum Capacitors for High Frequency Tunable Analog Applications

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 f...

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Veröffentlicht in:Nano letters 2016-08, Vol.16 (8), p.4746-4753
Hauptverfasser: Moldovan, Clara F, Vitale, Wolfgang A, Sharma, Pankaj, Tamagnone, Michele, Mosig, Juan R, Ionescu, Adrian M
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container_end_page 4753
container_issue 8
container_start_page 4746
container_title Nano letters
container_volume 16
creator Moldovan, Clara F
Vitale, Wolfgang A
Sharma, Pankaj
Tamagnone, Michele
Mosig, Juan R
Ionescu, Adrian M
description 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.
doi_str_mv 10.1021/acs.nanolett.5b05235
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