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- W4366992406 abstract "Theoretical studies on CdS/BiOI heterojunctions are lacking; therefore, this paper studies their electronic structure and optical properties through density functional theory calculations. First-principles calculations were made to investigate the effect of introducing oxygen vacancy defects on the photocatalytic efficiency of CdS/BiOI. The band gap of CdS/BiOI was effectively narrowed compared to that of its constituent materials, resulting in a redshift of the absorption edge. Based on the obtained work functions, the difference in Fermi energy levels caused a spontaneous flow of electrons, resulting in band bending and the establishment of a local electric field. The electric field promoted the separation of electron–hole pairs. At the same time, the addition of oxygen vacancies created impurity levels, allowing light absorption to extend to the infrared region, further promoting carrier separation. Our study reveals the origin of the enhanced efficiency of CdS/BiOI heterostructures and also predicts the photocatalytic activity of CdS/BiOI heterojunctions after introducing oxygen vacancies. These results may facilitate the design of such structures with enhanced photocatalytic properties." @default.
- W4366992406 created "2023-04-27" @default.
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- W4366992406 date "2023-09-01" @default.
- W4366992406 modified "2023-09-26" @default.
- W4366992406 title "Electronic structure and optical properties of CdS/BiOI heterojunction improved by oxygen vacancies" @default.
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- W4366992406 doi "https://doi.org/10.1016/j.jallcom.2023.170235" @default.
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