Abstract
We report a model dielectric function, ε = ε1 + iε2, of MoSe2 from 1 to 6.42 eV with which the optical property of a MoSe2 monolayer can be calculated at arbitrary temperatures from 31 to 300 K for potential application for device designs based on this material. Analytic representations, performed with the dielectric-function parametric model, allow interpolation with respect to both energy and temperature. We used reported spectrum data [Park et al., Sci. Rep. 8(1), 3173 (2018)] as the basis of our approach, verifying that the parameterized model dielectric function can reproduce the experimental data at various temperatures and can also produce the dielectric function (and the refractive index) at arbitrary temperatures.
Highlights
Like many transition metal dichalcogenides (TMDCs), molybdenum diselenide (MoSe2) has a layered structure of strong inplane bonding and weak out-of-plane interactions
dielectric-function parametric model (DFPM), which is obtained by the WVASE software
We reduced the number of data points appropriately to ensure fitting quality
Summary
Like many transition metal dichalcogenides (TMDCs), molybdenum diselenide (MoSe2) has a layered structure of strong inplane bonding and weak out-of-plane interactions. Because of these interactions, exfoliation is possible to realize two-dimensional layers of one unit cell thickness. Dielectric functions, ε = ε1 + iε, of MoSe2, including temperature dependence, are needed to design devices for these applications.. In order to be applied properly for device applications, the dielectric function of the monolayer MoSe2 should be available at arbitrary temperatures. We note that the surface current model was applied to obtain optical properties of monolayers (and ultrathin films with some atomic layer thickness).. We note that the surface current model was applied to obtain optical properties of monolayers (and ultrathin films with some atomic layer thickness). the purpose of this work is not to extract dielectric function values from experimental data but to utilize previously reported dielectric function spectra for further modeling to get optical properties at arbitrary temperatures
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