期刊
NANO ENERGY
卷 57, 期 -, 页码 581-591出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2018.12.082
关键词
Piezoelectric materials; PEH; FOM; k(ij); Q(m)
类别
资金
- National Research Council of Science AMP
- Technology (NST) [CAP-17-04-KRISS]
- Korea government (MSIP) [CAP-17-04-KRISS]
- KU-KIST graduate school program of Korea University
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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