Tent-Plate AlN PMUT with a Piston-Like Shape under Liquid Operation

Eyglis Ledesma, Ivan Zamora, Arantxa Uranga, Nuria Barniol*

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

11 Citations (Scopus)

Abstract

In this work, a waterproof tent-plate piezoelectric micromachined ultrasonic transducer (PMUT) with enhanced performance as actuator and sensor in comparison with standard clamped PMUT is presented. The squared AlN PMUT has four linear holes that are sealed by the passive layer allowing to increase the movement and giving the capability to work in liquid environment. The dimension of the holes was optimized to increase the PMUT displacement at least twice in relation with the regular clamped device. The acoustic performance of the PMUT was simulated in COMSOL Multiphysics and the results were experimentally verified under liquid operation. The experimental transmitting sensitivity, 3.9 kPa/V, as well as the sensor sensitivity, 13.4 V/MPa, provide a 2x factor improvement in contrast with the clamped PMUT with competitive values. Additionally, the presented tent-plate PMUT provides advantages in relation with the area, cost, power consumption and imaging quality thanks to the capability to be monolithically integrated over CMOS substrates.

Original languageAmerican English
Article number9096364
Pages (from-to)11128-11137
Number of pages10
JournalIEEE Sensors Journal
Volume20
Issue number19
DOIs
Publication statusPublished - 1 Oct 2020

Keywords

  • MEMS-on-CMOS
  • piezoelectric micromachined ultrasonic transducer (PMUT)
  • receiving sensitivity
  • transmitting sensitivity

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