考虑尺度效应的压电半导体纳米纤维力电耦合特性

文章基于挠曲电和应变梯度效应的共同影响,建立了静拉伸下一维压电半导体力电耦合计算模型,数值分析了挠曲电和应变梯度效应对位移、电势、电位移、载流子分布等物理场的影响。结果表明:两种效应对机械位移场没有影响,但对各电相关物理场的分布影响显著;挠曲电效应对压电结构本身的压电性能有抑制作用,而应变梯度效应却增强了其压电特性。本研究为压电类微纳结构的机电特性分析提供了理论指导。

Electro-Mechanical Coupling Properties of Piezoelectric Semiconductor Nanofibers Considering Scale Effect

By utilizing a developed electromechanical coupling model considering the coupled flexoelectric and strain gradient effect, the dimension-dependent physical fields such as displacement, electric potential, electric displacement and carrier distribution were systematically investigated. It is shown that the flexoelectricity and strain gradient have a significant influence on the electrical related physical fields, but less effect on the mechanical displacement. Furthermore, in contrast to the strain gradient enhancing effect, the piezoelectric properties of micro-nano structures are suppressed by flexoelectricity. This study provides a theoretical guidance for analysis of the electromechanical characteristics of piezoelectric micro-nanostructures.