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Vibration-based energy harvesting with stacked piezoelectrets

: Pondrom, P


Applied Physics Letters 104 (2014), Nr.17, Art.172901, 6 S.
ISSN: 0003-6951
ISSN: 1077-3118
Fraunhofer LBF ()
vibration; piezoelectrics

Vibration-based energy harvesters with multi-layer piezoelectrets (ferroelectrets) are presented. Using a simple setup with nine layers and a seismic mass of 8 g, it is possible to generate a power up to 1.3 µW at 140 Hz with an input acceleration of 1g. With better coupling between seismic mass and piezoelectret, and thus reduced damping, the power output of a single-layer system is increased to 5 µW at 700 Hz. Simulations indicate that for such improved setups with 10-layer stacks, utilizing seismic masses of 80 g, power levels of 0.1 to 1 mW can be expected below 100 Hz.