Operation of multi-finger graphene quantum capacitance varactors using planarized local bottom gate electrodes

M. A. Ebrish, H. Shao, S. J. Koester

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

The operation of multi-finger graphene quantum capacitance varactors fabricated using a planarized local bottom gate electrode, HfO 2 gate dielectric, and large-area graphene is described. As a function of the gate bias, the devices show a room-temperature capacitance tuning range of 1.22-1 over a voltage range of ±2 V. An excellent theoretical fit of the temperature-dependent capacitance-voltage characteristics is obtained when random potential fluctuations with standard deviation of 65 mV are included. The results represent a first step in realizing graphene quantum capacitance varactors for wireless sensing applications.

Original languageEnglish (US)
Article number143102
JournalApplied Physics Letters
Volume100
Issue number14
DOIs
StatePublished - Apr 2 2012

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