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• W3094977255 endingPage "105541" @default.
• W3094977255 startingPage "105541" @default.
• W3094977255 abstract "The commonly existed vacancy defects in semiconductors can affect optoelectronic properties. Here, to understand the vacancy defect influences on double perovskite Cs2AgBiBr6, based upon density functional theory calculations and supercell model, we systematically investigated Cs, Ag, Bi, Br, Cs–Br and Ag–Br atomic pair vacancy effects on crystal structure, electronic structures, optical absorption, charge carrier and exciton binding energies. It was found that, the vacancy defects in double perovskite Cs2AgBiBr6 induce slight deformation of crystal lattice. The vacancy defects cannot introduce extra defect states in the gap of energy band. The Cs, Ag, Bi, Ag–Br and Cs–Br defects not only change the band gap into the direct from the indirect of pristine system and reduce the band gap, but also promote the optical absorption capability, and result in red-shift of absorption spectra in low energy region. The Br vacancy leads to a heavy dopant character due to significant elevation of the Fermi level. The Cs, Ag, Bi, Ag–Br and Cs–Br vacancy defects also generate imbalanced charge transport properties, and increase exciton binding energies." @default.
• W3094977255 created "2020-11-09" @default.
• W3094977255 creator A5024844898 @default.
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• W3094977255 creator A5082308749 @default.
• W3094977255 creator A5084522060 @default.
• W3094977255 date "2021-03-01" @default.
• W3094977255 modified "2023-10-16" @default.
• W3094977255 title "Vacancy defects on optoelectronic properties of double perovskite Cs2AgBiBr6" @default.
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• W3094977255 doi "https://doi.org/10.1016/j.mssp.2020.105541" @default.
• W3094977255 hasPublicationYear "2021" @default.
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