Abstract
Using the first principles calculations, the electronic and optical properties of C, Mo and Mo-C-doped anatase TiO2 are studied. For the Mo mono-doped TiO2, the band gap reduces little, and the largest perturbation occurs at the CBM of TiO2. C mono-doping suppresses the effective band gap, but the partially occupied subbands in the gap probably also serve as the recombination centers for electrons and holes. Therefore, the Mo-C co-doping is investigated for the charge compensation consideration. We discuss six doped configurations and find that the total energy of the system is increased with increasing distance of C and Mo. It is found that co-doped configurations with C nearest to Mo possess the lowest total energy. Then, we focus on discussing three possible Mo-C adjacent co-doped configurations. The subbands mainly induced by C-2p states in the band gap become fully occupied because the Mo atom contributes sufficient electrons to C anion for compensation. At the same time, the effective band gap is narrowed about 0.9 eV and the perturbation at the CBM occurred in Mo mono-doped TiO2 disappears, which means the band edges of doped system still straddle the redox potentials of water. Furthermore, the optical properties of the compensated Mo-C adjacent co-doped TiO2 and pure TiO2 are calculated. The optical absorption edges of the Mo-C co-doped TiO2 shift towards the visible light region.
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Acknowledgments
This work was supported by the National 973 Projects of China (Grants No. 2011CB922101), the Natural Science Foundation of China (Grants No. 11234005 and No. 51332006), and the Priority Academic Program Development of Jiangsu Higher Education Institutions, China.
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Zhu, H.X., Liu, JM. First principles calculations of electronic and optical properties of Mo and C co-doped anatase TiO2 . Appl. Phys. A 117, 831–839 (2014). https://doi.org/10.1007/s00339-014-8433-0
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DOI: https://doi.org/10.1007/s00339-014-8433-0