4.6 Article

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

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APPLIED PHYSICS LETTERS
卷 100, 期 14, 页码 -

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AMER INST PHYSICS
DOI: 10.1063/1.3698394

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  1. National Science Foundation [ECCS-1124831]

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The operation of multi-finger graphene quantum capacitance varactors fabricated using a planarized local bottom gate electrode, HfO2 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 +/-2V. An excellent theoretical fit of the temperature-dependent capacitance-voltage characteristics is obtained when random potential fluctuations with standard deviation of 65mV are included. The results represent a first step in realizing graphene quantum capacitance varactors for wireless sensing applications. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3698394]

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