Abstract
Transition metal dichalcogenides (TMDs) are anisotropic materials crystallizing in a graphite-like structure, with each layer consisting of an hexagonal plane of transition metal atoms sandwiched between two hexagonal planes of chalcogen atoms. The weak interlayer Van der Waals bonds can be broken to isolate stable two-dimensional (2D) crystals. A wide variety of techniques have been developed to produce 2D-TMDs with electronic and optical properties extremely different from the bulk [1]. Among these, liquid–phase exfoliation (LPE) [2-3] has demonstrated to be a promising approach for scaling up to industrial level. The 2D versions of TMDs have attracted tremendous interest for optoelectronics applications because they offer properties that are complementary to those of graphene. They have a sizable electronic gap in the infrared and visible range and at the single-layer limit a transition from indirect to direct bandgap semiconductor occurs.
© 2017 IEEE
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