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Electronic band structures and surface states of ZnO finite well structures

Kuo-Feng Lin 

Department of Photonics, Institute of Electro-Optical Engineering, National Chiao Tung Univ, Hsinchu 30050, Taiwan

Abstract

Using tight binding representation of the layered systems grown along <0001> and <1-100> directions, we calculated the band structures (in Fig. 1) and wave functions (in the Fig. 2) for various ZnO slab layers with non-relaxed and non-reconstructed surfaces.  We show that dangling bonds on the two end-surfaces cause surface bands for different direction grown slabs.  Analyzing the wave functions across the layers, the surface states show a tendency toward surface localization.  Particularly, the splitting of the degenerate surface bands increase due to increasing overlap between their wave functions, which are localized on two nonpolar [1-100] end-surfaces, while it is not present for the [0001] finite well with polar end-surfaces.  Finally, we also found the extra electron-field due to the [0001] polar end-surfaces can effectively enhance the quantum confinement effect was shown in Fig. 3Figure.jpg.

 

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Presentation: Oral at E-MRS Fall Meeting 2008, Symposium F, by Kuo-Feng Lin
See On-line Journal of E-MRS Fall Meeting 2008

Submitted: 2008-04-30 15:21
Revised:   2009-06-07 00:48