Pt-incorporated anatase TiO2(001) surface for solar cell applications : First-principles density functional theory calculations

Details Pt-incorporated anatase TiO2(001) surface for solar cell applications : First-principles density functional theory calculations Pt-incorporated anatase TiO2(001) surface for solar cell applications : First-principles density functional theory calculations

2009-03-07

arxiv.org/abs/0903.1362v1

Phys. Rev. B 79, 125418 (2009).

Physics

Condensed Matter

Strongly Correlated Electrons

15 pages, 8 figures, 4 tables. to appear on Phys. Rev B

Scientific paper

10.1103/PhysRevB.79.125418

First-principles density functional theory calculations were carried out to determine the low energy geometries of anatase TiO$_2$(001) with Pt implants in the sublayers as substitutional and interstitial impurities as well as on the surface in the form of adsorbates. We investigated the effect of such a systematic Pt incorporation in the electronic structure of this surface for isolated and interacting impurities with an emphasis on the reduction in the band gap to visible region. Comprehensive calculations, for 1x1 surface, showed that Pt ions at interstitial cavities result in local segregation, forming metallic wires inside, while substitution for bulk Ti and adsorption drives four strongly dispersed impurity states from valence-bands up in the gap with a narrowing of ~1.5 eV. Hence, such a contiguous Pt incorporation drives anatase into infrared regime. Pt substitution for the surface Ti, on the other hand, metallizes the surface. Systematic trends for 2x2 surface revealed that Pt can be encapsulated inside to form stable structures as a result of strong Pt-O interactions as well as the adsorptional and substitutional cases. Dilute impurities considered for 2x2 surface models exhibit flat-like defect states driven from the valence bands narrowing the energy gap suitable to obtain visible light responsive titania.

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