Pyroelectric effect in PZT thick films for thermal energy harvesting in low-power sensors.

Abstract: Thermal-electrical energy converters based on pyroelectric effect are investigated for energy harvesting and possible use in ultralow-power sensor modules. Different elements based on thick films of lead zirconate titanate (PZT) sandwiched between metal electrodes deposited on alumina substrate were fabricated and characterized. The charge extracted was stored into a capacitor comparing performances offered by different rectifying circuits. Results show that the harvested energy can be compatible with use in autonomous sensors working in low-duty-cycle switched-supply mode. [ABSTRACT FROM AUTHOR]