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

作     者：Shengnan Lu Qingliang Liao Junjie Qi Shuo Liu Yichong Liu Qijie Liang Guangjie Zhang Yue Zhang 

作者机构：State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing Beijing 100083 China 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2016年第9卷第2期

页      面：372-379页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：This work was supported by the National Basic Research Program of China (No. 2013CB932602)  the Program of Introducing Talents of Discipline to Universities (No. B14003)  National Natural Science Foundation of China (Nos. 51527802 and 51232001) Beijing Municipal Science & Technology Commission  the Fundamental Research Funds for Central Universities 

主　　题：screening effect piezopotential Schottky junction Au@ZnO nanoarrays piezoelectric nanogenerator 

摘      要：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 μA/cm^2, 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.