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Electrical Characteristics of Top-Gated Graphene Field Effect Transistors Fabricated on Stainless Steel (STS) Substrate

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Top-gated Graphene transistors with Al2O3 gate-dielectric on the flexible stainless steel substrate have been demonstrated. Graphene was synthesized on copper foil using a chemical vapor deposition method and transferred onto the stainless steel substrate by wet transfer technique. The stainless steel substrate was polished by chemical mechanical polishing method and the spin-on-glass layer was coated on the surface to improve the surface roughness. The average surface roughness R a was as low as 5.9 nm from the AFM measurement. The measured hole and electron mobilities from the current–voltage characteristics at room temperature were calculated as high as 310 and 45 cm2/Vs, respectively. In addition, the effect of surrounding temperature up to 355 K on the electrical variations was investigated. The mobility was inversely proportional to the temperature with negligible hysteresis where the temperature coefficient was calculated as low as −0.65 %/K.
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Keywords: Flexible FET; Graphene; STS; Stainless Steel

Document Type: Research Article

Affiliations: 1: Division of IT Convergence Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Republic of Korea 2: Department of Electrical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Republic of Korea

Publication date: May 1, 2016

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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