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• W2700697977 abstract "First-principles plane-wave pseudopotential calculations were performed to study the energetics and electronic structures of oxygen defects on rutile TiO 2 (0 0 1). The influence of the material thickness on non-linearity (NL) was studied. With the increase in the thickness, the NL became stronger. Calculating the site-projected density of states by applying an external electric field showed that the NL of the bulk is due to the exchange of electrons between O 2p orbitals and Ti 3d orbitals. Finally, the influence of oxygen defects — oxygen vacancies (Vo), oxygen interstitials (Oi), and oxygen vacancies/oxygen interstitial (Vo[Formula: see text]Oi) pairs (Frenkel pair defects) — on the NL of TiO 2 was studied. These results demonstrate that the band gap ([Formula: see text] of TiO 2 became gradually narrower as the electric field increased. The Stark effect and defects can lead to the splitting of degenerate energy levels. Stronger electric fields increase the band splitting and reduce [Formula: see text]. With the increase in the Vo concentration, the decrease in the splitting amplitude and width of the energy level lead to weakening of the transfer of electrons between O and Ti atoms and optimizing the NL of TiO 2 . Therefore, the incorporation of Vo plays a significant role in improving the NL of TiO 2 ." @default.
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• W2700697977 date "2017-08-01" @default.
• W2700697977 modified "2023-10-02" @default.
• W2700697977 title "Study of the Non-Linearity on TiO2(0 0 1) Surface with Oxygen Defects: A First-Principles Study" @default.
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• W2700697977 doi "https://doi.org/10.1142/s1793292017500977" @default.
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