A Theoretical Investigation of Orientation-Dependent Transport in Monolayer MoS<sub>2</sub> Transistors at the Ballistic Limit

Abstract

Device performance of monolayer MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> transistors is investigated by atomistic simulations within the non-equilibrium Green's function formalism. A strong dependence of quantum transport on MoS2 orientation is predicted. To a large extent, the orientation dependence is due to subband transport properties and the atomistic structure along the transport direction. A bandgap is found in the conduction band along armchair direction (AD), which plays a major role for the orientation-dependent transport. At the same time, different atomic arrangements along AD and zigzag direction have different depletion region lengths, which also contribute to the orientation-dependent transport. Orientation dependence of drain current exists in MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> FETs having different gate lengths.