Modulating the Electronic Properties of Au–MoS₂ Interfaces Using Functionalized Self-Assembled Monolayers

Abstract

Molybdenum\ndisulfide (MoS₂) is a transition-metal dichalcogenide\nwith many applications including in electronic devices and sensors.\nA critical issue in the development of these devices is the high resistance\nbetween the metal contact and the molybdenum disulfide layer. In this\nstudy, we employ Raman spectroscopy and X-ray photoelectron spectroscopy\nto investigate the modification of Au–MoS₂ contact\nproperties using functionalized alkanethiolate self-assembled monolayers\n(SAMs). We demonstrate that both 2H and 1T MoS₂ strongly\ninteract with the underlying Au substrate. The electronic properties\nof the interface are mediated by the dipole moment of the alkanethiolate\nSAM, which have a −CH₃, −CO₂C₆F₅, −OH, or −COOH terminal group.\nFinally, we demonstrate the site-selective deposition of 2H and 1T\nMoS₂ on micropatterned SAMs to form conducting–semiconducting\npatterned MoS₂ films.