Abstract
Piezoelectric energy harvesting technology has received much attention as a powerful source of energy for a self-powered system. In this study, three main conjugated polymers that have delocalized π-electrons and excellent charge transport properties were studied: poly(3-hexylthiophene) (P1), poly[(4,8-di-(2-ethylhexyloxy)benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl)-alt-(5,5′-yl-4,4′-bis(dodecyl)-2,2′-bithiophene)] (P2) and poly[(4,8-di-(2-ethylhexyloxy)benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl)-alt-(5,5′-yl-4,4′-bis(2-ethylhexyl)-2,2′-bithiophene)] (P3). Each of three polymers was blended with phenyl-C61-butyric acid methyl ester (PCBM61), and the blend systems were used to make PVDF based piezoelectric nanogenerators (PNG-0–3). Polymers showed bimodal structures that have a majority edge-on orientation, forming a minority face-on orientation. At a 2Hz frequency and 0.2mm displacement, the output voltages (peak-to-peak) of PNG-(0–3) were 35.0V, 41.2V, 42.2V and 43.1V, respectively, and the output currents (peak-to-peak) were 558.5nA, 569.5nA, 572nA and 589nA, respectively. The energy conversion efficiencies of PNGs (0–3) were 6.47%, 11.62%, 13.36%, and 14.33%, respectively; therefore, the efficiency was improved by up to about 2.2 times.
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