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A theoretical study of step edge geometry on sapphire(0001) and its effect on ZnO nucleation |
Ping Yang, Li-Xin Zhang() |
School of Physics, Nankai University, Tianjin 300071, china |
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Abstract Step-edge-induced nucleation plays a key role in controlling the growth of novel nanostructures and low-dimensional materials. However, it is difficult to experimentally determine the step edge structures of complex metal oxides. In this work, we present a detailed theoretical study of the stability of stoichiometric steps on sapphire(0001). Based on first-principles calculations and excess charge computation by Finnis’ approach, a pair of non-polar step edges are determined to be the most stable. By studying the adsorption characteristics of ZnO and combining previous works, we successfully explained how growth temperature and deposition rate affect the in-plane orientation of ZnO grown on sapphire(0001). The knowledge on the step edge structures and nucleation patterns would benefit the study on step-edge-guided nanostructure growth.
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Keywords
stepped sapphire surface
first-principles
excess charge
step-edge-induced nucleation
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Corresponding Author(s):
Li-Xin Zhang
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Issue Date: 29 November 2018
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