Applied Physics

Graphene Circuits on Glass

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Science  15 Jul 2011:
Vol. 333, Issue 6040, pp. 269
DOI: 10.1126/science.333.6040.269-a

Although suspended graphene sheets can show extraordinarily high electrical conductivity, in solid-state device applications the choice of supporting substrate can be critical. For high-frequency applications, such as radio-frequency mixers, it is important to avoid parasitic capacitances set up by substrates such as silicon or silicon carbide that limit the extrinsic frequency cutoff in devices. Liao et al. transferred graphene grown on copper foils to a glass substrate, and then fabricated transistors with dielectrophoretically aligned cobalt silicide (Co2Si) nanowires as the top gate. The transistors can operate at a frequency of 30 GHz, and can be used for frequency doubling in the 1 to 10 GHz range. Devices with long nanowires (240 nm) exhibited current saturation, which indicated transistor operatation near the Dirac point of graphene. Such operation avoids the formation of third-order frequency coupling modes.

Nano Lett. 11, 10.1021/nl201922c (2011).

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