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Size-dependent pyroelectric properties of gallium nitride nanowires

Jin Zhang, Chengyuan Wang Orcid Logo

Journal of Applied Physics, Volume: 119, Issue: 14, Start page: 145102

Swansea University Author: Chengyuan Wang Orcid Logo

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DOI (Published version): 10.1063/1.4945765

Abstract

The size scale effect on the pyroelectric properties is studied for gallium nitride (GaN) nanowires (NWs) based on molecular dynamics simulations and the theoretical analysis. Significant influence of the surface thermoelasticity and piezoelectricity is achieved leading to the pyroelectric coefficie...

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Published in: Journal of Applied Physics
ISSN: 0021-8979 1089-7550
Published: 2016
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URI: https://cronfa.swan.ac.uk/Record/cronfa28836
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Abstract: The size scale effect on the pyroelectric properties is studied for gallium nitride (GaN) nanowires (NWs) based on molecular dynamics simulations and the theoretical analysis. Significant influence of the surface thermoelasticity and piezoelectricity is achieved leading to the pyroelectric coefficient of the NWs varying with the cross-sectional size. The pyroelectric potential is also calculated for GaN NWs subjected to heating. The results show that the size scale effect may raise the pyroelectric potential of thin NWs (cross sectional size in nanometers) by over 10 times. Such strong size scale effect on NWs is found to be the resultant effect of nanoscale thermoelasticity, piezoelectricity and dielectricity, and decrease with increasing cross-section of GaN NWs. It is expected that the present study may have strong implication in the field of energy harvesting at the nanoscale, as pyro-electricity offers a new avenue to the design of novel nanogenerators.
College: Faculty of Science and Engineering
Issue: 14
Start Page: 145102