Graphene has been one of the most exploited 2D materials in various fields. However, it is not the most suitable candidate for many electronic devices unless its bandgap structure is tuned through functionalization. Recently, among the post-graphene 2D materials, transition metal ditellurides, like MoTe2, have gained increasing research interest due to their unique physical properties. They offer two stable allotropic states, namely the semiconducting 2H phase and the metallic 1T’ phase, with a low energy difference of 44meV. Consequently, the phase transition between its semiconducting and metallic phase is likely to happen, thus making them suitable candidates for "phase-change" related applications, like 2D non-volatile memory devices and memristors.