First-principles of wurtzite ZnO (0001) and (0001) surface structures |
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Authors: | Zhang Yufei Guo Zhiyou Gao Xiaoqi Cao Dongxing Dai Yunxiao Zhao Hongtao |
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Affiliation: | Institute of Optoelectronic Material and Technology, South China Normal University, Guangzhou 510631, China |
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Abstract: | The surface structures ofwurtzite ZnO (0001) and (0001) surfaces are investigated by using a first-principles calculation of plane wave ultra-soft pseudo-potential technology based on density functional theory (DFT). The cal-culated results reveal that the surface energy of ZnO-Zn is bigger than that of ZnO-O, and the ZnO-Zn surface is more unstable and active. These two surfaces are apt to relax inward, but the contractions of the ZnO-Zn surface are smaller than the ZnO-O surface. Due to the dispersed Zn4s states and the states of stronger hybridization between the Zn and O atoms, the ZnO-Zn surface shows n-type conduction, while the O2p dangling-bond bands in the upper part of the valence cause the ZnO-O surface to have p-type conduction. The above results are broadly consistent with the experimental results. |
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Keywords: | ZnO (0001) and (0001) surface energy surface relaxation electronic structures |
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