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Open AccessArticle

Spray-On Liquid-Metal Electrodes for Graphene Field-Effect Transistors

Department of Electrical Engineering, University of Hawaii at Manoa, Honolulu, HI 96822, USA
Space and Naval Warfare Systems Center Pacific, Pearl City, HI 96782, USA
Author to whom correspondence should be addressed.
Micromachines 2019, 10(1), 54;
Received: 1 December 2018 / Revised: 23 December 2018 / Accepted: 8 January 2019 / Published: 14 January 2019
(This article belongs to the Special Issue Carbon Based Electronic Devices)
Advancements in flexible circuit interconnects are critical for widespread adoption of flexible electronics. Non-toxic liquid-metals offer a viable solution for flexible electrodes due to deformability and low bulk resistivity. However, fabrication processes utilizing liquid-metals suffer from high complexity, low throughput, and significant production cost. Our team utilized an inexpensive spray-on stencil technique to deposit liquid-metal Galinstan electrodes in top-gated graphene field-effect transistors (GFETs). The electrode stencils were patterned using an automated vinyl cutter and positioned directly onto chemical vapor deposition (CVD) graphene transferred to polyethylene terephthalate (PET) substrates. Our spray-on method exhibited a throughput of 28 transistors in under five minutes on the same graphene sample, with a 96% yield for all devices down to a channel length of 50 μm. The fabricated transistors possess hole and electron mobilities of 663.5 cm2/(V·s) and 689.9 cm2/(V·s), respectively, and support a simple and effective method of developing high-yield flexible electronics. View Full-Text
Keywords: graphene; Galinstan; Liquid-Metal; spray-on; aerosol; honey; mobility; contact resistance; TLM; I-V characteristics graphene; Galinstan; Liquid-Metal; spray-on; aerosol; honey; mobility; contact resistance; TLM; I-V characteristics
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Melcher, J.L.; Elassy, K.S.; Ordonez, R.C.; Hayashi, C.; Ohta, A.T.; Garmire, D. Spray-On Liquid-Metal Electrodes for Graphene Field-Effect Transistors. Micromachines 2019, 10, 54.

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