Size- and temperature-dependent piezoelectric properties of gallium nitride nanowires

J Zhang and CY Wang and R Chowdhury and S Adhikari, SCRIPTA MATERIALIA, 68, 627-630 (2013).

DOI: 10.1016/j.scriptamat.2012.12.022

The piezoelectric constant e(33) is calculated using molecular dynamic simulations for square gallium nitride (GaN) nanowires (NWs). Its magnitude is found to decrease significantly with increasing cross- section and temperature. An attempt is made to understand the physics behind the size- and temperature dependence of e(33). Specifically, a constant surface piezoelectric coefficient e(33)(s) = 0.52 x 10(-9)C/m is achieved for square GaN NWs independent of the geometric size of their cross-sections. (c) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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