Characterization of piezoelectric material for micro thermal harvesters

This paper presents the first realizations of a novel concept for thermal energy harvesting at micro scale. The devices proposed here are based on a two-step transduction combining thermo-mechanical and piezoelectric conversion. In this contribution, we present for the first time results on micro fabricated structures with integrated piezoelectric layers, focusing mainly on the characterization of the piezoelectric material. The process flow to get a bilayered bistable structure is briefly described, highlighting the way how to control the initial deflection. The characterization of the piezoelectric thin film is presented then. The e(31,f) coefficient is measured in both sensor and actuator mode and is found to be equal to -0,91 C.m(-2) in both configurations. This value, close to the state-of-the-art, is very promising for the future thermal harvesting applications. Finally the buckling of a structure actuated by a voltage was observed and the corresponding displacement measured by laser interferometry.

Published in:
14Th International Conference On Micro And Nanotechnology For Power Generation And Energy Conversion Applications (Powermems 2014), 557, 012087
Presented at:
14th International Conference on Micro- and Nano-Technology for Power Generation and Energy Conversion Applications (PowerMEMS), Hyogo, JAPAN, NOV 18-21, 2014
Bristol, IOP Publishing Ltd

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 Record created 2015-04-13, last modified 2019-03-17

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