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Spontaneous bending of piezoelectric nanoribbons: Mechanics, polarization, and space charge coupling

机译:压电纳米带的自发弯曲:力学,极化和空间电荷耦合

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摘要

A theory is developed to explain the spontaneous bending of polar ±(0001) faceted wurtzite nanoribbons, including the widely studied case of zinc oxide (ZnO) nanoarcs and nanorings. A rigorous thermodynamic treatment shows that bending of these nanoribbons can be primarily attributed to the coupling between piezoelectric effects, electric polarization, and the motion of free charge originating from point defects and/or dopants. The present theory explains the following experimental observations: the magnitude and sign of curvature and how this curvature depends on film thickness and dopant concentration. Good agreement between theory and experiment is obtained with no adjustable parameters. We identify three regimes of bending behavior with distinct thickness dependence for bending radius that depend on free carrier density, film thickness, and elastic, piezoelectric and dielectric constants.
机译:建立了一种理论来解释极性±(0001)刻面纤锌矿纳米带的自发弯曲,包括被广泛研究的氧化锌(ZnO)纳米弧和纳米环的情况。严格的热力学处理表明,这些纳米带的弯曲主要归因于压电效应,电极化和源自点缺陷和/或掺杂剂的自由电荷的运动之间的耦合。本理论解释了以下实验观察结果:曲率的大小和符号以及该曲率如何取决于膜厚度和掺杂剂浓度。在没有可调参数的情况下,理论与实验之间取得了良好的一致性。我们确定了三种弯曲行为方式,它们的弯曲半径与厚度具有明显的依赖性,弯曲半径取决于自由载流子密度,薄膜厚度以及弹性,压电和介电常数。

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  • 作者单位

    Princeton University, Princeton Institute for the Science and Technology of Materials (PRISM), Princeton, NJ 08544, USA;

    Princeton University, Department of Mechanical and Aerospace Engineering, Princeton Institute for the Science and Technology of Materials (PRISM), Princeton, NJ 08544, USA;

    Yeshiva University, Department of Physics. New York, NY 10033, USA;

    Princeton University, Department of Mechanical and Aerospace Engineering, Princeton Institute for the Science and Technology of Materials (PRISM), and the Program in Applied and Computational Mathematics, Princeton, NJ 08544, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    nanomechanics; piezoelectricity; surface stress; rod theory; zinc-oxide;

    机译:纳米力学压电;表面应力棒理论氧化锌;

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