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- W2038156622 endingPage "292202" @default.
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- W2038156622 abstract "Arsenic-doped ZnO (ZnO:As) films were grown by metal–organic chemical vapor deposition (MOCVD) on GaAs layers, which were deposited on sapphire substrates by sputtering using a GaAs target. The As doping was obtained by thermal diffusion. The ZnO:As films were annealed in nitrogen (ZnO:As:N2) and oxygen (ZnO:As:O2) atmosphere, respectively. X-ray photoelectron spectroscopy (XPS) measurements showed that annealing in oxygen facilitated even As doping in ZnO films and the content of As remains around 3.4% after Ar+ bombardment. However, annealing in N2 leads to the aliquation of As at the surface for ZnO:As films. Core level results show that there are two chemical states of As in ZnO:As:O2 films including AsZn–2VZn and AsZn, while four types exist in ZnO:As:N2 films including AsZn, AsZn–2VZn, Asi, and AsO. The contribution centered at around 43.9 eV of the As 3d peak is ascribed to AsZn–2VZn. The valence band maximum (VBM) spectrum taken by ultraviolet photoelectron spectroscopy (UPS) indicates that the Fermi energy of ZnO:As:O2 films shifts toward the VBM by 0.37 eV compared with undoped ZnO films, which proves AsZn–2VZn is an acceptor in ZnO:As:O2 films, but the ZnO:As films still show n-type conductivity, which is possibly due to the compensation of As-related donor and native defects. Detailed analysis of the chemical states of As may help point toward paths for growing high-quality ZnO:As films." @default.
- W2038156622 created "2016-06-24" @default.
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- W2038156622 date "2008-06-26" @default.
- W2038156622 modified "2023-09-27" @default.
- W2038156622 title "Study of arsenic doping ZnO thin films grown by metal–organic chemical vapor deposition via x-ray photoelectron spectroscopy" @default.
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- W2038156622 doi "https://doi.org/10.1088/0953-8984/20/29/292202" @default.
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