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<p>Based on ab-initio calculations, the effect of Cu, N and S doping in anatase TiO<sub>2</sub> is investigated. Copper (Cu) doping in anatase TiO₂ reduces the band gap of pristine TiO₂ from 2.17&#xa0;eV to 1.85&#xa0;eV by introducing Cu 3d states near the valence band maximum. In Nitrogen doped TiO<sub>2</sub>, the isolated N 2p states appears just above the valence band maximum, which can promote the electron-hole recombination and may limit the photocatalytic efficiency. Sulfur (S) doping lowered the band gap from 2.17 to 1.89&#xa0;eV. The nitrogen and sulfur co-doping significantly narrows the band gap (1.55&#xa0;eV) by introducing N 2p and S 3p states above the valence band maximum. In Cu, S codoped TiO<sub>2</sub>, the distance between top of valence band and bottom of the conduction at gamma point is 1.86&#xa0;eV. The narrow band gap of 1.80&#xa0;eV in tri-doped model (CuNS@TiO<sub>2</sub>) is attributed to the simultaneous creation of Cu 3d, N 2p, and S 3p states. The effective hybridization of Cu 3d, N 2p and S 3p with the host O 2p and Ti 3d states plays significant role in shifting the absorption edge toward visible regime. The optical absorption coefficient indicates that CuNS@TiO₂ exhibits the most promising absorption among the studied systems providing a suitable alternative photocatalyst working under visible light illuminations.</p>

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First-principle study of Cu, N, and S doped anatase TiO2 for visible-light response

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  • 发表日期：

    2026年7月22日

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  • Matiullah Khan,
  • Haseeb Ahmad

摘要

Based on ab-initio calculations, the effect of Cu, N and S doping in anatase TiO2 is investigated. Copper (Cu) doping in anatase TiO₂ reduces the band gap of pristine TiO₂ from 2.17 eV to 1.85 eV by introducing Cu 3d states near the valence band maximum. In Nitrogen doped TiO2, the isolated N 2p states appears just above the valence band maximum, which can promote the electron-hole recombination and may limit the photocatalytic efficiency. Sulfur (S) doping lowered the band gap from 2.17 to 1.89 eV. The nitrogen and sulfur co-doping significantly narrows the band gap (1.55 eV) by introducing N 2p and S 3p states above the valence band maximum. In Cu, S codoped TiO2, the distance between top of valence band and bottom of the conduction at gamma point is 1.86 eV. The narrow band gap of 1.80 eV in tri-doped model (CuNS@TiO2) is attributed to the simultaneous creation of Cu 3d, N 2p, and S 3p states. The effective hybridization of Cu 3d, N 2p and S 3p with the host O 2p and Ti 3d states plays significant role in shifting the absorption edge toward visible regime. The optical absorption coefficient indicates that CuNS@TiO₂ exhibits the most promising absorption among the studied systems providing a suitable alternative photocatalyst working under visible light illuminations.