부산대학교 도서관

Flexible piezoelectric energy harvesters have the potential to be used as power sources for wearable electronics. This study presents a simple printing-based fabrication process for a flexible piezoelectric energy-harvesting module with an integrated and optimized surface mount device (SMD)-based full-wave diode bridge rectifier. We investigate the effect of the electrode configuration on the energy-harvesting performance of the piezoelectric elements. Two types of piezoelectric elements are fabricated [a metal–insulator–metal (MIM) structure and an interdigitated electrode (IDE) structure] for comparison. The electrodes are inkjet printed using poly (3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT: PSS), and the piezoelectric layer is bar-coated using poly (vinylidene-fluoride-co-trifluoroethylene) (P(VDF-TrFE)). The results show that a higher output power density can be obtained with the MIM-based energy harvester ( $7.8~\mu \text{W}$ /cm 3 ) when compared to the IDE-based harvester (20.8 nW/cm 3 ). Simulation results show that this is explained by the higher current output (i.e., charge generation ability) of the MIM-based structure.