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Loại tài liệu: Tài liệu số
Thông tin trách nhiệm: Yanjun Ji
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Năm Xuất Bản:
Using density functional theory and ultra-soft pseudopotential method based on first principles calculations, thernadsorption energies, work functions, dipole moments, partial density of states, Mulliken population and chargerndifferential densities of Cs adsorbed Al0.5Ga0.5N(0001) surfaces were calculated at the coverage of 0.25 ML. AfterrnCs adsorption, the charges of Cs atom transfer to the Al and Ga atoms in the first molecular layer of the surface,rnthe surface dipole moments increase, the density of states move to low energy, and the work functions decrease.rnThe electron cloud increased after Cs adsorption, when Cs at BAl site, Ga and Cs form ionic bond, Al and Cs formrncovalent bond. The calculations indicate that the BAl site is the most stable adsorption site.
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