Research Article

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2016, 9(2): 372–379

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https://doi.org/10.1007/s12274-015-0916-6

The enhanced performance of piezoelectric nanogenerator via suppressing screening effect with Au particles/ZnO nanoarrays Schottky junction

Shengnan Lu1, Qingliang Liao1, Junjie Qi1, Shuo Liu1, Yichong Liu1, Qijie Liang1, Guangjie Zhang1, and Yue Zhang1,2 (*)

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1 State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and
Technology Beijing, Beijing 100083, China
2 Key Laboratory of New Energy Materials and Technologies, University of Science and Technology Beijing, Beijing 100083, China

Keywords: screening effect, piezopotential, Schottky junction, Au@ZnO nanoarrays, piezoelectric nanogenerator
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  • Abstract
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This paper describes a novel strategy to weaken the piezopotential screening effect by forming Schottky junctions on the ZnO surface through the introduction of Au particles onto the surface. With this approach, the piezoelectric-energyconversion performance was greatly enhanced. The output voltage and current density of the Au@ZnO nanoarray-based piezoelectric nanogenerator reached 2 V and 1 A/cm2, respectively, 10 times higher than the output of pristine ZnO nanoarray-based piezoelectric nanogenerators. We attribute this enhancement to dramatic suppression of the screening effect due to the decreased carrier concentration, as determined by scanning Kelvin probe microscope measurements and impedance analysis. The lowered capacitance of the Au@ZnO nanoarraybased piezoelectric nanogenerator also contributes to the improved output. This work provides a novel method to enhance the performance of piezoelectric nanogenerators and possibly extends to piezotronics and piezophototronics.
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The enhanced performance of piezoelectric nanogenerator via suppressing screening effect with Au particles/ZnO nanoarrays Schottky junction. Nano Res. 2016, 9(2): 372–379 https://doi.org/10.1007/s12274-015-0916-6

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