Piezoelectric characteristics of PZT thin films on polymer substrate

Piezoelectric characteristics of PZT thin films on polymer substrate
강민규도영호오승민레자 파우리즈키 라하유김이연강종윤남산윤석진
Issue Date
Bulletin of the American Physical Society
VOL 57, NO 1
The goal of piezoelectric energy harvesting is to improve the power efficiency of devices. One of the approaches for the improvement of power efficiency is to apply the large strain on the piezoelectric materials and then many scientists approached using thin films or nano-structured piezoelectric materials to obtain flexibility. However, the conventional thin film processes available for the fabrication of piezoelectric materials as PbZr$_{0.52}$Ti$_{0.48}$O$_{3}$ (PZT) are not compatible with flexible electronics because they require high processing temperatures ($>$700$^{o}$C) to obtain piezoelectricity. Excimer laser annealing (ELA) is attractive heat process for the lowtemperature crystallization, because of its material selectivity and short heating time. In this study, the amorphous PZT thin films were deposited on polymer substrate by rf-sputtering. To crystallize the amorphous films, the ELA was carried out with various conditions as function of the applied laser energy density, the number of pulse, and the repetition rate. To evaluate the piezoelectric characteristics, piezoelectric force microscopy (PFM) and electrometer are used. As a result, we obtained the crystallized PZT thin film on flexible substrate and obtained flexible piezoelectric energy harvester.
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