Highly-sensitive and highly-correlative flexible motion sensors based on asymmetric piezotronic effect
Highly-sensitive and highly-correlative flexible motion sensors based on asymmetric piezotronic effect
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DOI：
10.1016/j.nanoen.2018.06.059
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发表时间：
2018-09
期刊：
影响因子：
17.6
通讯作者：
Jae Won Lee;B. Ye;Zhong Lin Wang;Jong-Lam Lee;J. M. Baik
中科院分区：
文献类型：
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作者：
Jae Won Lee;B. Ye;Zhong Lin Wang;Jong-Lam Lee;J. M. Baik
本文介绍了两种高灵敏度的柔性运动传感器(基于柔性GaN的压电式纳米发电机和紫外光二极管)，这种传感器是基于柔性GaN薄膜上产生的非对称极化，以及用于精确运动测量的非常高的相关性。其工作机制是基于压电效应，在界面上使用极化电荷来调节电子和光电子过程。纳米发电机表现出很高的灵敏度(凹弯时S=93，0.45%)，而凸弯导致灵敏度降低到24。电致发光强度也随着弯曲方向的变化而几乎呈线性下降，这在共聚焦扫描电致发光显微镜图像中随着弯曲运动的变化而清楚地显示出来。这两组测量值与非常敏感的方向信息显示出很高的相关性(凹弯和凸弯下的R2分别为0.98和0.96)。这种方法不仅可以识别弯曲的方向，还可以测量应变的大小，从而实现多功能的运动检测传感装置。
This paper describes two highly-sensitive flexible motion sensors (piezoelectric nanogenerators and ultraviolet light emitting diodes based flexible GaN) based on asymmetric polarization created across flexible GaN film and very high correlations of the sensors for precise motion measurement. The operation mechanism is based on piezotronic effect using polarization charges at the interface for tuning the electronic and optoelectronic processes. The nanogenerator showed very high sensitivity (S= 93 at 0.45% under concave bending) and the convex bending led to the decrease of the sensitivity to 24. The electroluminescence intensity also almost linearly decreased with the change of the bending direction, clearly shown in the confocal scanning electroluminescence microscopy images with the bending motion. The two sets of measures showed very high correlations (R2= 0.98 and 0.96 under concave and convex bending, respectively) with very sensitive directional information. This approach makes to recognize the direction of bending as well as to measure the magnitude of the strain for realizing multi-functional, motion detection sensing devices.