MoS2 monolayers are flexible, and thin-film FETs have been shown to retain their electronic properties when bent to a 0.75mm radius of curvature. They have a stiffness comparable to steel, and a higher breaking strength than flexible plastics (such as polyimide(PI) and polydimethylsiloxane (PDMS)), making them particularly suitable for flexible electronics. MoS2 and other 2D TMDCs may offer a route to technologies beyond electronics, where degrees of freedom (other than charge) can be utilized for information storage and processing. The electronic band structure of MoS2 displays energy maxima of the valence band and minima of the conduction band at both the K and K' (often called -K) points of the Brillouin zone. These two discrete 'valleys' have the same energy gap but are discrete in position in momentum space. The optical transitions in these valleys require angular momentum changes of +1 for the K-point and -1 for the K' point. Hence, excitons can be selectively excited into a valley with circularly polarised light – with right-handed (σ+) polarised light exciting excitons in the K valley and left-handed (σ-) polarised light exciting excitons in the K valley.
Conversely, light emitted from exciton recombination in the K valley will be σ+ polarised, and light emitted from exciton recombination in the K' valley will be σ- polarised. Since these valleys can be independently addressed, they represent a degree of freedom called 'valley pseudospin' that could be used in 'valleytronic' devices. Furthermore, each valley's spin-orbit split valence band has opposite spin signs at the K and K points. For example, an A-exciton in the K valley consists of a spin-up electron and a spin-down hole, and a K valley B-exciton has a spin-down electron and spin-up hole. Their constituent charge carriers have the opposite spin for A and B excitons in the K' valley. If you are looking for high quality, high purity, and cost-effective Molybdenum disulfide, or if you require the latest price of Molybdenum disulfide, please feel free to email contact mis-asia.
