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Determination of the appropriate piezoelectric materials for various types of piezoelectric energy harvesters with high output power

Authors
Kim, Sun-WooLee, Tae-GonKim, Dae-HyeonLee, Ku-TakJung, InkiKang, Chong-YunHan, Seung HoKang, Hyung-WonNahm, Sahn
Issue Date
3월-2019
Publisher
ELSEVIER
Keywords
Piezoelectric materials; PEH; FOM; k(ij); Q(m)
Citation
NANO ENERGY, v.57, pp.581 - 591
Indexed
SCIE
SCOPUS
Journal Title
NANO ENERGY
Volume
57
Start Page
581
End Page
591
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/67157
DOI
10.1016/j.nanoen.2018.12.082
ISSN
2211-2855
Abstract
For a type-1 piezoelectric energy harvester (PEH), in which stress develops in the supporting system of the piezoelectric materials, the electromechanical coupling factor (k(ij)) of the piezoelectric materials is important for the output power at the resonance frequency. Therefore, soft-piezoelectric materials are good candidates for these PEHs. For type-2 PEHs, in which stress develops in the piezoelectric material and supporting system, the figure of merit (FOM) of the output power at the resonance frequency is (k(ij)(2) x Q(m))/s(11)(E), where Q(m) and s(11)(E) are the mechanical quality factor and the elastic compliance of piezoelectric materials, respectively. In particular, the effect of Q(m) is very large for these PEHs, indicating that hard-piezoelectric materials are good candidates for type-2 PEHs operating at the resonance frequency. For both type-1 and type-2 PEHs operating at off-resonance frequency, the k(ij)(2) x d(ij) x g(ij) is the FOM of the output power of the PEHs, where g(ij) is a piezoelectric voltage constant. Therefore, soft-piezoelectric materials are also good candidates for both type-1 and type-2 PEHs operating at the off-resonance frequency.
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