Flexoelectricity-enhanced photovoltaic effect in trapezoid-shaped NaNbO_(3)nanotube array composites  

作　　者：Fang Yu Junyuan Tian Fengying Jiang Yunjie Liu Chaohai Li Chengwei Wang Zhong Lin Wang Kailiang Ren 

机构地区：[1]Center on Nanoenergy Research,School of Physical Science and Technology,Guangxi University,Nanning 530004,China [2]CAS Center for Excellence in Nanoscience,Beijing Key Laboratory of Micronano Energy and Sensor,Beijing Institute of Nanoenergy and Nanosystems,Chinese Academy of Sciences,Beijing 100083,China [3]School of Nanoscience and Technology,University of Chinese Academy of Sciences,Beijing 100049,China [4]School of Materials Science and Engineering,Georgia Institute of Technology,Atlanta,GA 30332-0245,USA

出　　处：《Nano Research》2023年第9期11914-11924,共11页纳米研究（英文版）

基　　金：supported by the National Key Research&Development project from the Ministry of Science and Technology in China(No.2021YFB3200303);It was also partially supported by the National Natural Science Foundation of China(No.52172082).

摘　　要：In this work,we successfully prepared vertically aligned NaNbO_(3)nanotube(NN-NT)with trapezoidal shapes,in which the orthorhombic and monoclinic phases coexisted.According to the structure analysis,the NN-NT/epoxy composite film had excellent flexoelectric properties due to the lattice distortion caused by defects and irregular shape.The flexoelectric effect is the greatest in the vertical direction in the flexible NN-NT/epoxy composite film,and the flexoelectric coefficient()is 2.77×10^(−8)C·m^(−1),which is approximately 5-fold higher than that of the pure epoxy film.The photovoltaic current of the NN-NT/epoxy composite film increased from 39.9 to 71.8 nA·cm^(−2)in the direction of spontaneous polarization when the sample was bent upward due to the flexoelectricity-enhanced photovoltaic(FPV)effect.The flexoelectric effect of the NN-NT/epoxy composite film could modulate the photovoltaic response by increasing it by 80%or reducing it to 65%of the original value.This work provides a new idea for further exploration in efficient and lossless ferroelectric memory devices.

关 键 词：flexoelectric effect photovoltaic effect flexoelectricity-enhanced photovoltaic(FPV)effect trapezoid NaNbO_(3)nanotube(NN-NT)array NN-NT/epoxy composite film 

分 类 号：TB383[一般工业技术—材料科学与工程]