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

Title
Determination of the appropriate piezoelectric materials for various types of piezoelectric energy harvesters with high output power
Authors
강종윤정인기Sun-Woo KimTae-Gon LeeDae-Hyeon KimKu-Tak LeeSeung Ho HanHyung-Won KangSahn Nahm
Issue Date
2019-03
Publisher
Nano energy
Citation
VOL 57-591
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 (kij) 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 (kij2 ×  Qm)/s11E, where Qm and s11E are the mechanical quality factor and the elastic compliance of piezoelectric materials, respectively. In particular, the effect of Qm 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 kij2 ×  dij ×  gij is the FOM of the output power of the PEHs, where gij 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.
URI
http://pubs.kist.re.kr/handle/201004/70870
ISSN
2211-2855
Appears in Collections:
KIST Publication > Article
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