Zhang Bowen, Tan Dan, Cao Xiaodan, Tian Junyuan, Wang Yonggui, Zhang Jinxi, Wang Zhonglin, Ren Kailiang
Beijing Key Laboratory of Micro-nano Energy and Sensors, CAS Center for Excellence in Nanoscience, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, P.R. China.
School of Physical Sciences, University of Chinese Academy of Science, Beijing 100049, P.R. China.
ACS Nano. 2022 May 24;16(5):7834-7847. doi: 10.1021/acsnano.2c00450. Epub 2022 May 9.
In this investigation, we report the flexoelectricity-enhanced photovoltaic (FPV) effect in a flexible Pb(ZrTi)O nanowire (PZT NW) array/PDMS (polydimethylsiloxane) nanocomposite. The simulation result of density functional theory (DFT) indicated that the FPV effect in PZT NWs can be greatly affected by the interactions of the strain gradients with the internal field generated by self-polarization. We found that when the nanocomposite film was curved down, the photovoltaic current of the aligned PZT-NW/PDMS composite increased by 84.6-fold and 27.6-fold compared with the PZT-nanoparticles/PDMS and randomly aligned PZT-NW/PDMS nanocomposites at the same curvature, respectively. This is mainly ascribed to the increased flexoelectricity in the aligned PZT-NW/PDMS nanocomposite. This study will contribute to a full understanding of the influence of nanoparticle shape on the flexophotovoltaic effect of nanocomposites. It will have potential use in nanocomposites for the study of the FPV effect and associated applications.
在本研究中，我们报道了柔性铅锆钛酸氧纳米线（PZT NW）阵列/聚二甲基硅氧烷（PDMS）纳米复合材料中的挠曲电增强光伏（FPV）效应。密度泛函理论（DFT）的模拟结果表明，PZT纳米线中的FPV效应会受到应变梯度与自极化产生的内场之间相互作用的显著影响。我们发现，当纳米复合薄膜向下弯曲时，在相同曲率下，取向排列的PZT-NW/PDMS复合材料的光伏电流分别比PZT纳米颗粒/PDMS和随机取向的PZT-NW/PDMS纳米复合材料增加了84.6倍和27.6倍。这主要归因于取向排列的PZT-NW/PDMS纳米复合材料中挠曲电的增加。本研究将有助于全面理解纳米颗粒形状对纳米复合材料挠曲光伏效应的影响。它在用于研究FPV效应及相关应用的纳米复合材料中具有潜在用途。
