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Based on first-principles calculations employing density functional theory with a planewave ultrasoft pseudopotential approach, we performed computations using the CASTEP (Cambridge Sequential Total Energy Package) module within the Materials Studio software. The electronic band structures, density of states, and optical properties of intrinsic monolayer WTe2, monolayer WTe2 with a single tellurium vacancy (VTe), and rare-earth-doped VTe-containing monolayer WTe2 (VTe-X, where X = Ce, Yb, Eu) were systematically investigated to explore the synergistic effects of rare-earth doping and tellurium vacancy defects on the optical properties of monolayer WTe2. The results indicate that, compared to the VTe model, the VTe-X models lead to a more pronounced enhancement of the optical performance in the infrared region (0 eV– 1.2 eV). All VTeX structures exhibit metallic characteristics, with a notable increase in the density of states near the Fermi level. In particular, the VTe-Yb model demonstrates significant improvement in the infrared range: the absorption coefficient, reflectivity, static dielectric constant, and peak value of the imaginary part of the dielectric function are enhanced by factors of 3.76, 1.83, 2.63, and 24.20, respectively, compared to those of pristine monolayer WTe2. This study provides a theoretical foundation for the design of infrared photodetectors based on monolayer WTe2 substrates.
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Keywords:
- Monolayer WTe2 /
- First principles /
- Optical property
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