Jalali, N*; Woolliams, P D; Stewart, M; Weaver, P M; Cain, M G; Dunn, S*; Briscoe, J* (2014) Improved performance of p-n junction-based ZnO Nanogenerators through CuSCN-passivation of ZnO nanorods. J. Mater. Chem. A, 2 (28). pp. 10945-10951.

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Abstract

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 mW cm2 peak power density associated with release at an acceleration of 50 g. Impedance analysis determined that the device RC time constant (sRC), correlated with device peak voltage, demonstrating a relationship between the screening effects in ZnO and sRC.

Item Type:	Article
Subjects:	Advanced Materials Advanced Materials > Functional Materials
Identification number/DOI:	10.1039/c4ta01714e
Last Modified:	02 Feb 2018 13:13
URI:	http://eprintspublications.npl.co.uk/id/eprint/6277

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