Two Dimensional Materials Beyond MoS2 : Noble-Transition-Metal Dichalcogenides

The structure and electronic structure of layered noble-transition-metal dichalcogenides MX2 (M = Pt and Pd, and chalcogenides X = S, Se, and Te) have been investigated by periodic density functional theory (DFT) calculations. The MS2 monolayers are indirect band-gap semiconductors whereas the MSe2 and MTe2 analogues show significantly smaller band gap and can even become semimetallic or metallic materials. Under mechanical strain these MX2 materials become quasi-direct band-gap semiconductors. The mechanical-deformation and electron-transport properties of these materials indicate their potential application in flexible nanoelectronics.