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The electronic structures and optical properties of intrinsic SnO_2,Zn-doped SnO_2,SnO_2 with Sn vacancy(V_(Sn)) and Zn-doped SnO_2 with Sn vacancy are explored by using first-principles calculations.Zn-doped SnO_2 is a p-type semiconductor material,whose Fermi level shifts into the valence band when Zn atoms substitute Sn atoms,and the unoccupied states on the top of the valence band come from Zn 3d and O 2p states.Sn vacancies increase the relative hole number of Zn-doped SnO_2,which results in a possible increase in the conductivity of Zn-doped SnO_2.The Zn-doped SnO_2 shows distinct visible light absorption,the increased absorption can be seen apparently with the presence of Sn vacancies in the crystal,and the blue-shift of optical spectra can be observed.
The electronic structures and optical properties of intrinsically SnO_2, Zn-doped SnO_2, SnO_2 with Sn vacancy (V_ (Sn)) and Zn-doped SnO_2 with Sn vacancy are explored by using first-principles calculations. type semiconductor material, whose Fermi level shifts into the valence band when Zn atoms substitute Sn atoms, and the unoccupied states on the top of the valence band come from Zn 3d and O 2p states. Sn vacancies increase the relative hole number of Zn-doped SnO 2, which results in a possible increase in the conductivity of Zn-doped SnO 2. Zn-doped SnO 2 shows distinct visible light absorption, the increased absorption can seen apparently with the presence of Sn vacancies in the crystal, and blue-shift of optical spectra can be observed.