Abstract
Electronic band structures and surface states were investigated for ZnO finite wells or slabs grown along ⟨0 0 0 1⟩ and ⟨1 − 1 0 0⟩ directions using tight-binding representation. The dangling bonds on two end-surfaces caused surface bands for different direction grown slabs, of which the wavefunctions tend to localize at the end-surfaces. The increasing splitting of the degenerate surface bands at the Γ point was observed to decrease with the thickness of the nonpolar [1 − 1 0 0] slab. And the quantum confinement effect is distinctively enhanced by the extra electron field induced in the ⟨0 0 0 1⟩ grown finite well with the polar end-surfaces.
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