Variable distance interdigitated electrodes design to improve the performance of cantilever piezoelectric thin films nanogenerators

Document Type : Research Article

Authors

Faculty of Mechanics, Malek Ashtar University of Technology, Iran

Abstract

A small-scaled device for ambient energy harvesting is a high voltage cantilever nanogenerator with interdigitated electrodes carrying a tip mass that acts upon the strain induced in the top piezoelectric layer. In this device, more strain gradient over the length, more electric potential in adjacent electrodes depending on the vibration mode shape at which voltage cancelation may occur. In this work, changing the distance between the electrodes proportional to the inverse of strain function, the induced voltage in all the electrodes are equalized that prevents the voltage cancelation. The Euler-Bernoulli beam model is used for the problem and the governing time-dependent equation is derived based on the energy method. Then, the 4th order Runge-Kutta method is used to solve it from which the output voltage is derived for base excitation. The results show that it is possible to increase the voltage by 36% for optimal electrical load by this procedure and for 40% for open circuit conditions. The system coupling is also increased by 10%. Moreover, the results show that the smaller size of electrodes, the higher the output voltage. Whereas, increasing the number of electrodes makes the voltage reduce in contrast with the electric current. 

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References

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Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 4
July 2021
Pages 2347-2366

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