Piezoelectric micro-machined ultrasonic transducer (pMUT) for energy harvesting

Autor: B. Cavallier, Eric Cattan, Patrick Delobelle, Skandar Basrour, Benoit Charlot, K. Dogheche, M. Marzencki, Laurent Hirsinger, Sylvain Ballandras, Denis Remiens
Přispěvatelé: Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) (FEMTO-ST), Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS), Miglierina, Myriam, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Techniques de l'Informatique et de la Microélectronique pour l'Architecture des systèmes intégrés (TIMA), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), Université de Franche-Comté (UFC)-Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Université de Technologie de Belfort-Montbeliard (UTBM), Institut d’Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520 (IEMN), Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Université Polytechnique Hauts-de-France (UPHF)-Ecole Centrale de Lille-Université Polytechnique Hauts-de-France (UPHF)-Institut supérieur de l'électronique et du numérique (ISEN), Techniques of Informatics and Microelectronics for integrated systems Architecture (TIMA), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)
Jazyk: angličtina
Rok vydání: 2005
Předmět:
Zdroj: Ultrasonics Symposium, 18-21 Sept. Rotterdam Pays-Bas
Ultrasonics Symposium, 18-21 Sept. Rotterdam Pays-Bas, 2005, Netherlands
HAL
Proceedings of the 2005 IEEE International Ultrasonics Symposium
Ultrasonics Symposium, 18-21 Sept.
Ultrasonics Symposium, 18-21 Sept., Sep 2005, Rotterdam, Netherlands. pp.939-942, ⟨10.1109/ULTSYM.2005.1603005⟩
Ultrasonics Symposium, 18-21 Sept., 2005, Rotterdam, Netherlands. pp.939-942
ISSN: 1051-0117
DOI: 10.1109/ULTSYM.2005.1603005⟩
Popis: ISSN: 1051-0117; Micro-electromechanical devices dedicated to energy scavenging purpose have yield an increasing interest for a few years. In this paper we report on the fabrication of PZT/Si piezoelectric micro-machined ultrasonic transducers (pMUT) first designed to ultrasonic imaging applications that may be used as a mechanical to electrical energy transformer for energy harvesting. This work aims to demonstrate the ability of pMUT to convert inertial energy into electrical energy through the piezoelectric layer deposited atop silicon membrane. The diameter of the membrane ranges from 132 µm to 600 µm and the thickness of silicon and PZT are respectively set to 1 and 2 µm. It is shown that the membrane exhibit a deformed shape, as the PZT is under lateral compression, with a maximum deflection equal to more than 1.5 times the equivalent membrane thickness. We first aimed to design a bistable micro power generator as the device could take two stable states that respectively corresponds to the case of PZT under lateral compression and the case of PZT under lateral extension (the symmetric deformation state). First experiments consist in testing the capability of the pMUT to change from one state to the other by a simple and weak mechanical excitation ranging from 0.5g to 2g acceleration. The experiment results have demonstrated two typical mechanical behaviours, linear (elastic) and non-linear (bistable). The pMUT device can generate electricity along both mechanical behaviours. The elastic mode has been emphasized as we observed different levels of generated voltages corresponding to different levels of mechanical excitation. The membrane is presumably deformed by the inertial excitation at a level less or equal than the threshold enabling to change state. In this case the membrane should then return to its initial stable state along an elastic behaviour. The bistable behaviour has been emphasized as we observed two state changes, i.e. two very sharp opposite and equal signals (larger than 180 mV on a 1 M. input impedance oscilloscope), corresponding to the stress inversion (compression to extension and extension to compression) with both respective flow of generated electrical charges. It should be noted that first results were limited by air damping and electrical damping. As a consequence we have developed a piezoelectric finite element model that takes into account the electrical load in the pMUT design. Further simulations with this finite element model should enable to optimize the impedance load of the pMUT for harvesting the maximum electrical energy.
Databáze: OpenAIRE
Externí odkaz: