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A convenient approach to tuning the local piezopotential of an extensional piezoelectric semiconductor fiber via composite structure design
Nano Energy ( IF 17.6 ) Pub Date : 2021-10-14 , DOI: 10.1016/j.nanoen.2021.106626
Kai Fang 1 , Nian Li 1 , Peng Li 1 , Zhenghua Qian 1 , Vladimir Kolesov 2 , Iren Kuznetsova 2
Affiliation  

It has been demonstrated that the local piezopotential property of a piezoelectric semiconductor (PS) fiber has a great influence on its piezotronic performance. However, tuning the local piezopotential of the PS fiber is quite difficult due to its small size. To solve this problem, a feasible approach, i.e., composite structure design, is proposed in this paper. A two-layer composite structure is utilized to demonstrate that the local piezopotential of a PS fiber can be tuned by axial forces applied at the two ends. Based on the one-dimensional phenomenological model, theoretical and numerical analysis are performed and the local manipulation mechanism is successfully illustrated. It shows that local potential barriers and wells will emerge as long as the piezoelectric polarization is discontinuous along the fiber. The properties of these barriers and wells, including the number, the relative heights and depths, directly depend on the material combination and geometry size of different composite components, which makes it possible to artificially design the piezotronic performance of PS fibers. It also shows that the output voltage of a PS fiber based nanogenerator is significantly improved when employing composite structures. This is because part of electrons are confined to the produced local barrier, thus reducing the number of electrons that would screen the piezopotential near the two ends. In addition, the I-V characteristic of the composite fiber is further studied and its dependence on the local potential change is revealed. Conclusions obtained in the present paper have great potential applications in piezotronic field.



中文翻译:

一种通过复合结构设计调节可拉伸压电半导体纤维局部压电势的简便方法

已经证明,压电半导体(PS)纤维的局部压电电势特性对其压电性能有很大影响。然而,由于尺寸小,调整 PS 光纤的局部压电电位非常困难。针对这一问题,本文提出了一种可行的方法,即复合结构设计。利用两层复合结构来证明 PS 纤维的局部压电电位可以通过施加在两端的轴向力来调节。基于一维现象学模型,进行了理论和数值分析,成功地说明了局部操纵机制。它表明,只要压电极化沿光纤不连续,就会出现局部势垒和势垒。这些屏障和井的性质,包括数量、相对高度和深度,直接取决于不同复合组件的材料组合和几何尺寸,这使得人为设计 PS 纤维的压电性能成为可能。它还表明,当采用复合结构时,基于 PS 纤维的纳米发电机的输出电压得到显着提高。这是因为部分电子被限制在产生的局部势垒中,从而减少了屏蔽两端附近压电势的电子数量。除此之外 这使得人工设计 PS 纤维的压电性能成为可能。它还表明,当采用复合结构时,基于 PS 纤维的纳米发电机的输出电压得到显着提高。这是因为部分电子被限制在产生的局部势垒中,从而减少了屏蔽两端附近压电势的电子数量。除此之外 这使得人工设计 PS 纤维的压电性能成为可能。它还表明,当采用复合结构时,基于 PS 纤维的纳米发电机的输出电压得到显着提高。这是因为部分电子被限制在产生的局部势垒中,从而减少了屏蔽两端附近压电势的电子数量。除此之外进一步研究了复合纤维的IV特性,并揭示了其对局部电位变化的依赖性。本文得出的结论在压电电子领域具有巨大的潜在应用价值。

更新日期:2021-10-21
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