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HomeKey Engineering MaterialsKey Engineering Materials Vols. 645-646Size Effect of Piezoelectricity in ZnO Nanowires:...

Size Effect of Piezoelectricity in ZnO Nanowires: A First-Principles Study

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Abstract:

Piezoelectric properties of ZnO nanowires orientated along [0001] are investigated via density functional theory (DFT). A new method to calculate the volume of nanowires was proposed, which is crucial to the value of piezoelectric coefficients. Results show that the axial effective piezoelectric coefficients are 29.99 Cm^-², 25.93 Cm^-², 22.82 Cm^-² for ZnO nanowires with diameters of about 0.6 nm, 1.2 nm, 1.8 nm, which are considerably larger than that of the bulk (20.19Cm^-2). It is found that the change in volume during the strain played a dominated role in size effects. This work helps to gain a deeper understanding of the piezoelectric size effects in ZnO nanowires.

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Micro-Nano Technology XVI

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Periodical:

Key Engineering Materials (Volumes 645-646)

Pages:

275-280

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.645-646.275

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Online since:

May 2015

Authors:

Chuan Qion Qin*, You Song Gu, Xu Sun, Chen Li, Yue Zhang

Keywords:

Density Functional Theory, Piezoelectricity, Size Effects, ZnO Nanowires

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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