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Nanomaterials 2018, 8(1), 14;

Gate Tunable Transport in Graphene/MoS2/(Cr/Au) Vertical Field-Effect Transistors

Department of Physics & Astronomy and Graphene Research Institute, Sejong University, Seoul 05006, Korea
Department of Nanotechnology & Advanced Materials Engineering, Sejong University, Seoul 05006, Korea
Author to whom correspondence should be addressed.
Received: 11 November 2017 / Revised: 21 December 2017 / Accepted: 22 December 2017 / Published: 28 December 2017
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Two-dimensional materials based vertical field-effect transistors have been widely studied due to their useful applications in industry. In the present study, we fabricate graphene/MoS2/(Cr/Au) vertical transistor based on the mechanical exfoliation and dry transfer method. Since the bottom electrode was made of monolayer graphene (Gr), the electrical transport in our Gr/MoS2/(Cr/Au) vertical transistors can be significantly modified by using back-gate voltage. Schottky barrier height at the interface between Gr and MoS2 can be modified by back-gate voltage and the current bias. Vertical resistance (Rvert) of a Gr/MoS2/(Cr/Au) transistor is compared with planar resistance (Rplanar) of a conventional lateral MoS2 field-effect transistor. We have also studied electrical properties for various thicknesses of MoS2 channels in both vertical and lateral transistors. As the thickness of MoS2 increases, Rvert increases, but Rplanar decreases. The increase of Rvert in the thicker MoS2 film is attributed to the interlayer resistance in the vertical direction. However, Rplanar shows a lower value for a thicker MoS2 film because of an excess of charge carriers available in upper layers connected directly to source/drain contacts that limits the conduction through layers closed to source/drain electrodes. Hence, interlayer resistance associated with these layers contributes to planer resistance in contrast to vertical devices in which all layers contribute interlayer resistance. View Full-Text
Keywords: vertical transport; transition metal dichalcogenides; MoS2; graphene vertical transport; transition metal dichalcogenides; MoS2; graphene

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Nazir, G.; Khan, M.F.; Aftab, S.; Afzal, A.M.; Dastgeer, G.; Rehman, M.A.; Seo, Y.; Eom, J. Gate Tunable Transport in Graphene/MoS2/(Cr/Au) Vertical Field-Effect Transistors. Nanomaterials 2018, 8, 14.

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