Non-Lithographic Fabrication of All-2D α-MoTe 2 Dual Gate Transistors

Abstract

As one of the emerging new transition-metal dichalcogenides materials, molybdenum ditelluride (α-MoTe2) is attracting much attention due to its optical and electrical properties. This study fabricates all-2D MoTe2-based field effect transistors (FETs) on glass, using thin hexagonal boron nitride and thin graphene in consideration of good dielectric/channel interface and source/drain contacts, respectively. Distinguished from previous works, in this study, all 2D FETs with α-MoTe2 nanoflakes are dual-gated for driving higher current. Moreover, for the present 2D dual gate FET fabrications on glass, all thermal annealing and lithography processes are intentionally exempted for fully non-lithographic method using only van der Waal's forces. The dual-gate MoTe2 FET displays quite a high hole and electron mobility over ≈20 cm2 V−1 s−1 along with ON/OFF ratio of ≈105 in maximum as an ambipolar FET and also demonstrates high drain current of a few tens-to-hundred μA at a low operation voltage. It appears promising enough to drive organic light emitting diode pixels and NOR logic functions on glass.