A broadband piezoelectric energy harvester for IoT based applications

Asthana, Prateek; Khanna, Gargi

doi:10.1016/j.mejo.2019.104635

Cited by 25 publications

(7 citation statements)

References 25 publications

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“…Aspect ratio is the structure thickness ratio, and the finger spacing distance. Energy harvesting methodologies may be utilised to provide the power requirements for the proposed device [26][27][28][29].…”

Section: Resultsmentioning

confidence: 99%

Variation of Sensitivity of a MEMS Capacitive Accelerometer Based Microphone with Suspension System Topology

Dwivedi¹,

Asthana²,

Khanna³

et al. 2021

Hearing Loss - From Multidisciplinary Teamwork to Public Health

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The present research seeks to improve a highly sensitive MEMS capacitive accelerometer as a probable completely implantable hearing aid microphone. The research analyses the effect of different suspension system topologies on accelerometer efficiency. The topology of folded beam suspension is considered to be the most suitable for the proposed system. The design factors such as weight, height and resonant frequency are considered to make the accelerometer an effective biomedical system which can be completely implanted with COMSOL MULTIPHYSICS 4.2 the optimized system is simulated and validated. The accelerometer occupies 1mm2 of sensing area and achieves a nominal capacitance of 5.30 pF and an optimized capacitive sensitivity of 6.89fF.

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Section: Resultsmentioning

confidence: 99%

Variation of Sensitivity of a MEMS Capacitive Accelerometer Based Microphone with Suspension System Topology

Dwivedi¹,

Asthana²,

Khanna³

et al. 2021

Hearing Loss - From Multidisciplinary Teamwork to Public Health

Self Cite

View full text Add to dashboard Cite

show abstract

“…Piezoelectric energy harvesting devices can scavenge waste kinetic energy, transforming it into electrical energy. While power outputs are typically modest, on the order of μW, the small size of piezoelectric energy harvesting devices makes the technology attractive for powering microwireless electronics. − The electromechanical coupling factor gives a measure of how efficiently a piezoelectric material converts input mechanical energy into electric energy, false( k i , j false) 2 = true( 1 ε true) i i c j j d i , j d i , j The suitability of a piezoelectric in an energy harvesting device can be assessed by the following figure of merit: F j k = d i , j true( 1 ε true) i i ′ e i ′ , k = s j l e i , l true( 1 ε true) i i ′ e i ′ , k …”

Section: Discussionmentioning

confidence: 99%

Piezoelectric Response of Plastic Ionic Molecular Crystals: Role of Molecular Rotation

Sødahl

Walker

Berland

2023

Crystal Growth & Design

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Plastic ionic molecular crystals are a novel class of materials that have attracted recent interest due to the discovery of ferroelectric and piezoelectric properties together with an orientationally disordered mesophase with high plasticity. Despite the growing interest, little is known about the mechanisms that underpin their piezoelectric properties. To address this knowledge gap, we use density functional theory calculations with van der Waals density functionals to study the dielectric, piezoelectric, and elastic properties of 11 plastic ionic molecular crystals. The piezoelectric coefficients were found to reach values comparable to inorganic piezoelectrics. Further, some plastic crystals have strikingly large piezoelectric anisotropies. For HQReO4 (quinuclidinium perrhenate) an anisotropy of |d 16/d 33| = 118 was found, 11 times that of LiNbO3, a phase pure inorganic noted for its anisotropy. Our study links the anisotropy to the rotational motion of the constituent molecules in response to shear stress. The large shear piezoelectric coefficients, yet modest dielectric permittivity, results in coupling coefficientsa measure of its suitability for energy harvestingwith values up to 0.79. Our study points to the engineering of the rotational response of plastic ionic crystals as key to realizing the outstanding functional properties of these compounds.

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“…Piezoelectric energy harvesting devices scavenge waste kinetic energy, transforming it to electrical energy. While power outputs are typically modest, on the order of µW, the small size of piezoelectric energy harvesting devices make the technology attractive for powering microwireless electronics [103][104][105][106]. The electromechanical coupling factor gives a measure of how efficiently a piezoelectric converts input mechanical energy to electric energy [1],…”

Section: B Assessment Of Energy Harvesting Potentialmentioning

confidence: 99%

Piezoelectric Response of Plastic Ionic Molecular Crystals: Role of Molecular Rotation

Sødahl

Walker

Berland

2022

Preprint

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Plastic ionic molecular crystals are a novel class of materials that have attracted recent interest due to the discovery of ferroelectric and piezoelectric properties together with an orientationally disordered mesophase with high plasticity. Despite the growing interest, little is known about the mechanisms that underpin their piezoelectric properties. To address this knowledge gap, we study the dielectric, piezoelectric and elastic properties of eleven plastic ionic molecular crystals using van der Waals density functional theory. The piezoelectric coefficients were found to reach values comparable to inorganic piezoelectrics. Further, some plastic crystals have strikingly large piezoelectric anisotropies. For HQReO4 (Quinuclidinium perrhenate) an anisotropy of |d 16 /d 33 | = 119 was found, 11 times that of LiNbO3, a phase pure inorganic noted for its anisotropy. Our study links the anisotropy to rotational motion of the constituent molecules in response to shear stress. The large shear piezoelectric coefficients, yet modest dielectric permittivity results in coupling coefficients – a measure of its suitability for energy harvesting – with values up to 0.79. Our study points to the engineering of the rotational response of plastic ionic crystals as key to realizing the outstanding functional properties of these compounds.

show abstract

A broadband piezoelectric energy harvester for IoT based applications

Cited by 25 publications

References 25 publications

Variation of Sensitivity of a MEMS Capacitive Accelerometer Based Microphone with Suspension System Topology

Variation of Sensitivity of a MEMS Capacitive Accelerometer Based Microphone with Suspension System Topology

Piezoelectric Response of Plastic Ionic Molecular Crystals: Role of Molecular Rotation

Piezoelectric Response of Plastic Ionic Molecular Crystals: Role of Molecular Rotation

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