Abstract
In this Paper, we employ the density functional theory to investigate the electronic and optical properties of rutile TiO\(_2\), Sm doped and (Sm, C) co-doped TiO\(_2\) materials. We use the Tran-Blaha modified Beck Johnson (TB-mBJ) potential. This functional can estimate the band gap of these compounds with more accuracy compared to the generalized gradient approximation (GGA). The obtained electronic band gap of the pristine TiO\(_2\) is \(E_g = 2.76\) eV, which is close to the experimental value \(E_g = 3.0\) eV. We report also that Sm doped and (Sm, C) co-doped TiO\(_2\) are stable in ferromagnetic state. The magnetic moment of samarium is consistent with other literature works. Furthermore, adding samarium atom with 4f states and carbon atom with activated 2p states improve appreciably the optical properties in the visible light range. The corresponding obtained optical band gap value of the (Sm,C) co-doped TiO\(_2\) is an optimal one which evidences that the materials is capable of showing high power conversion efficiency. Additionally, the enhancement of optical absorption under the visible-light of these materials, especially the co-doped one can find suitable applications in optoelectronic devices.
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Acknowledgements
A.G.E.H wants to acknowledge the postdoctoral grant provided by CONACYT with No. A1-S-13294. This research was supported through computational resources provided by FS-UM5R.
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El Yousfi, A., Bouda, H., El Hachimi, A.G. et al. Enhanced optical absorption of rutile TiO2 through (Sm, C) codoping: a first-principles study. Opt Quant Electron 53, 95 (2021). https://doi.org/10.1007/s11082-021-02735-z
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DOI: https://doi.org/10.1007/s11082-021-02735-z