Piezoelectric Energy Harvester Based on LiNbO3 Thin Films.

Zakhar Vakulov,Zhubing He,Boris G Konoplev,Viktor S Klimin,Daniil Khakhulin,Oleg I Il’In,Marina V Il’Ina,Oleg A Ageev,Andrey Geldash,Vladimir N Dzhuplin

doi:10.3390/ma13183984

Abstract

This paper reports the results of the influence of the energy of laser pulses during laser ablation on the morphology and electro-physical properties of LiNbO3 nanocrystalline films. It is found that increasing laser pulse energy from 180 to 220 mJ results in the concentration of charge carriers in LiNbO3 films decreasing from 8.6 × 1015 to 1.0 × 1013 cm−3, with the mobility of charge carriers increasing from 0.43 to 17.4 cm2/(V·s). In addition, experimental studies of sublayer material effects on the geometric parameters of carbon nanotubes (CNTs) are performed. It is found that the material of the lower electrode has a significant effect on the formation of CNTs. CNTs obtained at the same growth time on a sample with a Cr sublayer have a smaller diameter and a longer length compared to samples with a V sublayer. Based on the obtained results, the architecture of the energy nanogenerator is proposed. The current generated by the nanogenerator is 18 nA under mechanical stress of 600 nN. The obtained piezoelectric nanogenerator parameters are used to estimate the parameters of the hybrid-carbon-nanostructures-based piezoelectric energy converter. Obtained results are promising for the development of efficient energy converters for alternative energy devices based on lead-free ferroelectric films.

Highlights

Despite a significant improvement in the performance of computing system components, essential progress in the fabrication of high-efficiency batteries has not yet been achieved [1]
carbon nanotubes (CNTs) obtained at the same growth time on a sample with a Cr sublayer had a smaller diameter diameter and a longer length compared to samples with a V sublayer
CNTs obtained at the same growth time on a sample with a Cr sublayer had a smaller diameter and a longer length compared to samples with a V sublayer

Summary

Introduction

Despite a significant improvement in the performance of computing system components, essential progress in the fabrication of high-efficiency batteries has not yet been achieved [1]. The increase in performance has led to an increase in power consumption, which leads to a reduction in battery life, significantly limits the functionality of modern electronic devices, and increases the weight and size parameters of the power supply elements [2]. Battery life is limited compared to the duty cycle of the device. Materials 2020, 13, 3984 today as an alternative to electrochemical batteries and can be used as an autonomous energy source for portable devices and wireless sensors [3,4,5,6]. Advances in wireless technology and MEMS have made it possible to use power converters as an alternative to conventional electrochemical batteries, which are already used as power sources for portable electronics [7]

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Conclusion