Temperature Dependence of the Dielectric Function of Monolayer MoSe₂.

ABSTRACT: The dielectric function [Formula: see text] of monolayer molybdenum diselenide (MoSe₂) is obtained and analyzed at temperatures from 31 to 300 K and at energies from 0.74 to 6.42 eV. The sample is a large-area, partially discontinuous monolayer (submonolayer) film of MoSe₂ grown on a sapphire substrate by selenization of pulsed laser deposited MoO₃ film. Morphological and optical characterizations verified the excellent quality of the film. The MoSe₂ data were analyzed using the effective medium approximation, which treats the film and bare substrate regions as a single layer. Second derivatives of ε with respect to energy were numerically calculated and analyzed with standard lineshapes to extract accurate critical-point (CP) energies. We find o

SUBMITTER: Park HG 

PROVIDER: S-EPMC5816670 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature