By Ignacio Gutiérrez Lezama, Alberto Ubaldini, Maria Longobardi, Enrico Giannini, Christoph Renner, Alexey B Kuzmenko and Alberto F Morpurgo Semiconducting transition metal dichalcogenides (TMDs) have emerged as materials that can be used to
realize two-dimensional (2D) crystals possessing rather unique transport and optical properties.
Most research has so far focused on sulfur and selenium compounds, while tellurium-based materials
have attracted little attention so far. As a first step in the investigation of Te-based
semiconducting TMDs in this context, we have studied MoTe 2 crystals with thicknesses above 4 nm,
focusing on surface transport and a quantitative determination of the gap structure. Using
ionic-liquid gated transistors, we show that ambipolar transport at the surface of the material is
reproducibly achieved, with hole and electron mobility values between …read more
Via: 2D materials