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Effect of Passivation on Piezoelectricity of ZnO Nanowire
GongChen
Department of Physics, University of Science and Technology of China, Hefei 230026, P. R. China
Abstract:
Surface passivation is one valuable approach to tune the properties of nanomaterials. The piezo- electric properties of hexagonal [001] ZnO nanowires with four kinds of surface passivations were investigated using the rst-principles calculations. It is found that in the 50% H(O), 50% Cl(Zn); 50% H(O), 50% F(Zn) passivations, the volume and surface e ects both enhance the piezoelectric coecient. This di ers from the unpassivated cases where the surface e ect was the sole source of piezoelectric enhancement. In the 100% H; 100% Cl passivations, the piezoelectric enhancement is not possible since the surface e ect is screened by surface charge with weak polarization. The study reveals that the competition between the volume e ect and surface e ect in uences the iden- ti cation of the diameter-dependence phenomenon of piezoelectric coecients for ZnO nanowires in experiments. Moreover, the results suggest that one e ective means of improving piezoelectricity of ZnO nanowires is shrinking axial lattice or increasing surface polarization through passivation.
Key words:  Piezoelectricity, ZnO nanowire, Passivation, First-principles calculation
FundProject:
Effect of Passivation on Piezoelectricity of ZnO Nanowire
GongChen
Department of Physics, University of Science and Technology of China, Hefei 230026, P. R. China
摘要:
Surface passivation is one valuable approach to tune the properties of nanomaterials. The piezo- electric properties of hexagonal [001] ZnO nanowires with four kinds of surface passivations were investigated using the rst-principles calculations. It is found that in the 50% H(O), 50% Cl(Zn); 50% H(O), 50% F(Zn) passivations, the volume and surface e ects both enhance the piezoelectric coecient. This di ers from the unpassivated cases where the surface e ect was the sole source of piezoelectric enhancement. In the 100% H; 100% Cl passivations, the piezoelectric enhancement is not possible since the surface e ect is screened by surface charge with weak polarization. The study reveals that the competition between the volume e ect and surface e ect in uences the iden- ti cation of the diameter-dependence phenomenon of piezoelectric coecients for ZnO nanowires in experiments. Moreover, the results suggest that one e ective means of improving piezoelectricity of ZnO nanowires is shrinking axial lattice or increasing surface polarization through passivation.
关键词:  Piezoelectricity, ZnO nanowire, Passivation, First-principles calculation
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