2D TRANSITION Metal Dichalcogenides: MAGIC Semiconductor

Transition metal dichalcogenides (TMDCs) are semiconductors of the type MX2, where M is a transition metal atom such as molybdenum (Mo) or tungsten (W), and X is the chalcogen atoms (typically Sulphur (S), selenium(Se) or tellurium (Te) [1-4].

TMDCs show diverse properties that depend on their composition (i.e., M & X). For instance, 2H-MoS2 is semiconductor, while 1T-MoS2 is metallic in nature.

Moreover, bulk 2H-MoS2 having an indirect band gap, but when 2H-MoS2 is exfoliated into monolayers, it exhibits direct electronic and optical band gaps, which leads to enhanced photoluminescence

References
1. Manzeli, S., et al., 2D transition metal dichalcogenides. Nature Reviews Materials, 2017. 2(8): p. 17033.
2. Splendiani, A., et al., Emerging Photoluminescence in Monolayer MoS2. Nano Letters, 2010. 10(4): p. 1271-1275.
3. Wang, Q.H., et al., Electronics and optoelectronics of two-dimensional transition metal dichalcogenides. Nature Nanotechnology, 2012. 7(11): p. 699-712.
4. Radisavljevic, B., et al., Single-layer MoS2 transistors. Nature Nanotechnology, 2011. 6(3): p. 147-150.