Comparative study between the pillar-and bulk-type multilayer structures for piezoelectric energy harvesters

摘要

In this paper, we present piezoelectric energy harvesters with pillar- and bulk-type multilayer ceramic-polymer composite structures as energy sources. The 0.2(PbMg_(1/3)Nb_(2/3)O_3)-0.8 (PbZr_(0.475)Ti_(0.525)O_3) ceramics were sintered and poled using the conventional ceramic process. The piezoelectric ceramics were prepared in the form of rectangular pillar- and cylindrical bulk-type structures and were attached to the metallic bottom electrode with poled states. Symmetric upper electrodes were attached to the other side. The pillar- and bulk-type ceramic structures were filled with polydimethylsiloxane (PDMS). Subsequently, the two ceramic structure types were manufactured with single-, double-, and triple-layer devices. Both the multi- and single-layer devices were compared using several analysis methods. The piezoelectric properties, including the piezoelectric constant, are discussed in this paper. We also studied the output power of the multi- and single-layer devices.