研究目的

To present an analytic expression of the dielectric function of monolayer molybdenum disulfide (MoS2) for energies from 1.4 to 6.0 eV and temperatures from 35 to 350 K, and to observe the fundamental absorption peak at the K point of the Brillouin zone.

研究成果

The dielectric function parametric model successfully represented the dielectric function of monolayer MoS2 as ten structures including the trionic A-, the two excitonic A0 and B features, other excitonic and band-to-band critical points from 1.4 to 6.0 eV at temperatures from 35 to 350 K. These results are expected to be useful in basic research and technological applications, including film growth and the design of 2D nano-optoelectric devices based on monolayer MoS2.

研究不足

The study is limited to the optical properties of monolayer MoS2 in the x-y plane and does not account for the anisotropic nature of MoS2 along the z-axis. The largest discrepancy between data and reconstructed lineshapes occurs near 2 to 3 eV, where many sharp structures exist, but this difference is less than 3.6%.