期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 2, 期 28, 页码 10945-10951出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta01714e
关键词
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资金
- Engineering and Physical Sciences Research Council
- European Metrology Research Programme (EMRP)
- EMRP participating countries within EURAMET
- European Union
- UK's National Measurement Office, BIS, UK Government
Self-powered piezoelectric systems are vital components to harvest ambient waste energy for applications such as autonomous self-powered sensors. ZnO nanorod-based devices are gaining wide attention for energy harvesters as they are easily synthesized at low temperature onto a range of substrates. However, losses related to screening of piezoelectric polarisation charges by free carriers in ZnO nanorods can significantly reduce the output of these devices. This paper reports using copper thiocyanate (CuSCN) to reduce ZnO surface-state-induced parasitic losses and improve power density of ZnO nanorod-based energy harvesters by a factor of 10. The surface modified energy harvester generated 1.07 V as an instantaneous peak open circuit voltage giving a maximum calculated 434 mu W cm(-2) peak power density associated with release at an acceleration of 50 g. Impedance analysis determined that the device RC time constant (tau(RC)), correlated with device peak voltage, demonstrating a relationship between the screening effects in ZnO and tau(RC).
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