Abstract
We fabricated piezoelectric energy harvesters composed of c-axis oriented Pb(Zr,Ti)O_3 (PZT) thin films transferred onto stainless steel substrates.In order to improve resonance frequency,we designed a cantilever with a tip mass.PZT thin firms were epitaxially grown on MgO substrates using rf-magnetoron sputtering and transferred onto stainless steel substrate by eximer laser liftoff.Transferred PZT thin firms had a low dielectric constant (ε_r=340) and high piezoelectric coefficient(e_<31.1>=-4.76 C/m^2).The energy harvester had a resonance frequency of 143.2 Hz.At the optimal load resistance of 90 kΩ and resonance frequency of 143.2 Hz, theenergy harvester generated output power of 2.02μW at an acceleration of 1m/s^2 and 49μW at acceleration of 7.5 m/s^2.
