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Flexophotovoltaic Effect in Potassium Sodium Niobate/Poly(Vinylidene Fluoride‐Trifluoroethylene) Nanocomposite
Advanced Science ( IF 14.3 ) Pub Date : 2021-02-08 , DOI: 10.1002/advs.202004554 Chenchen Wang 1 , Yang Zhang 2 , Bowen Zhang 1 , Bo Wang 3 , Jinxi Zhang 1 , Long-Qing Chen 3 , Qiming Zhang 4 , Zhong Lin Wang 1, 5 , Kailiang Ren 1, 6
Advanced Science ( IF 14.3 ) Pub Date : 2021-02-08 , DOI: 10.1002/advs.202004554 Chenchen Wang 1 , Yang Zhang 2 , Bowen Zhang 1 , Bo Wang 3 , Jinxi Zhang 1 , Long-Qing Chen 3 , Qiming Zhang 4 , Zhong Lin Wang 1, 5 , Kailiang Ren 1, 6
Affiliation
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Flexoelectricity is an electromechanical coupling effect in which electric polarization is generated by a strain gradient. In this
investigation, a potassium sodium niobite/poly(vinylidene fluoride‐trifluoroethylene) (KNN/PVDF‐TrFE)‐based nanocomposite is fabricated, and the flexoelectric effect is used to enhance the photovoltaic current (Ipv) in the nanocomposite. It is found that both a pyroelectric current and photovoltaic current can be generated simultaneously in a light illumination process. However, the photovoltaic current (Ipv) in this process contributes ≈85% of the total current. When assessing the effect of flexoelectricity with a curvature of 1/20, the Ipv of the curved KNN/PVDF‐TrFE (20%) (K/P‐20) composite increased by ≈13.9% compared to that of the flat K/P‐20 nanocomposite. Similarly, at a curvature of 1/20, the Ipv of the K/P‐20 nanocomposite is 71.6% higher than that of the PVDF‐TrFE film. However, the photovoltaic effect induced by flexoelectricity is much higher than the increased polarization from flexoelectricity, so this effect is called as the flexophotovoltaic effect. Furthermore, the calculated energy conversion efficiency of the K/P‐20 film is 0.017%, which is comparable to the previous research result. This investigation shows great promise for PVDF‐based nanocomposites in ferroelectric memory device applications.
中文翻译：
铌酸钾钠/聚偏二氟乙烯-三氟乙烯纳米复合材料的柔性光伏效应
挠曲电是一种机电耦合效应，其中电极化是由应变梯度产生的。在这项研究中，制备了铌酸钾钠/聚偏二氟乙烯-三氟乙烯（KNN/PVDF-TrFE）基纳米复合材料，并利用挠曲电效应来增强纳米复合材料中的光伏电流（ I pv ）。研究发现，光照射过程中可以同时产生热释电电流和光伏电流。然而，该过程中的光伏电流（ I pv ）贡献了总电流的约85%。当评估曲率为 1/20 的挠曲电效应时，弯曲 KNN/PVDF-TrFE (20%) (K/P-20) 复合材料的I pv比平面 K/ 增加了约 13.9% P-20 纳米复合材料。同样，在曲率为 1/20 时，K/P-20 纳米复合材料的I pv比 PVDF-TrFE 薄膜高 71.6%。然而，弯曲电引起的光伏效应远高于弯曲电增加的极化，因此这种效应被称为弯曲光伏效应。此外，计算得出K/P-20薄膜的能量转换效率为0.017%，与之前的研究结果相当。这项研究显示了基于 PVDF 的纳米复合材料在铁电存储器件应用中的巨大前景。
更新日期：2021-02-08
中文翻译：
铌酸钾钠/聚偏二氟乙烯-三氟乙烯纳米复合材料的柔性光伏效应
挠曲电是一种机电耦合效应，其中电极化是由应变梯度产生的。在这项研究中，制备了铌酸钾钠/聚偏二氟乙烯-三氟乙烯（KNN/PVDF-TrFE）基纳米复合材料，并利用挠曲电效应来增强纳米复合材料中的光伏电流（ I pv ）。研究发现，光照射过程中可以同时产生热释电电流和光伏电流。然而，该过程中的光伏电流（ I pv ）贡献了总电流的约85%。当评估曲率为 1/20 的挠曲电效应时，弯曲 KNN/PVDF-TrFE (20%) (K/P-20) 复合材料的I pv比平面 K/ 增加了约 13.9% P-20 纳米复合材料。同样，在曲率为 1/20 时，K/P-20 纳米复合材料的I pv比 PVDF-TrFE 薄膜高 71.6%。然而，弯曲电引起的光伏效应远高于弯曲电增加的极化，因此这种效应被称为弯曲光伏效应。此外，计算得出K/P-20薄膜的能量转换效率为0.017%，与之前的研究结果相当。这项研究显示了基于 PVDF 的纳米复合材料在铁电存储器件应用中的巨大前景。
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