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A thickness-mode piezoelectric micromachined ultrasound transducer annular array using a PMN-PZT single crystal
- A thickness-mode piezoelectric micromachined ultrasound transducer annular array using a PMN-PZT single crystal
- Kang, Woo Jin; Jung, Joon Taek; Lee, Won Jun; Ryu, Jungho; Choi, Hong Soo
- DGIST Authors
- Choi, Hong Soo
- Issue Date
- Journal of Micromechanics and Microengineering, 28(7)
- Article Type
- Annular Array; Behavior; Effective Electro-Mechanical Coupling Coefficients; Electromechanical Coupling; Etching Characteristics; Fabrication; Ferroelectric Ceramics; Films; High-Frequency; Inductively Coupled Plasma; Inductively Coupled-Plasma Reactive Ion Etching; Lead Magnesium Niobate-Lead Zirconate Titanate; Lead Zirconate Titanate; Magnesium Compounds; Mechanism; MEMS; Micro electromechanical system (MEMS); Niobium Compounds; Performance; Photoelectron-Spectra; piezoelectric MEMS; Piezoelectric Transducers; Piezoelectricity; PMN-PZT; PMN-PZT single crystal; pMUT; Reactive Ion Etching; Single Crystals; Thin; Transducers; Ultrasonic Transducer
- Micro-electromechanical system (MEMS) technologies were used to develop a thickness-mode piezoelectric micromachined ultrasonic transducer (Tm-pMUT) annular array utilizing a lead magnesium niobate-lead zirconate titanate (PMN-PZT) single crystal prepared by the solid-state single-crystal-growth method. Dicing is a conventional processing method for PMN-PZT single crystals, but MEMS technology can be adopted for the development of Tm-pMUT annular arrays and has various advantages, including fabrication reliability, repeatability, and a curved element shape. An inductively coupled plasma-reactive ion etching process was used to etch a brittle PMN-PZT single crystal selectively. Using this process, eight ring-shaped elements were realized in an area of 1 × 1 cm2. The resonance frequency and effective electromechanical coupling coefficient of the Tm-pMUT annular array were 2.66 (±0.04) MHz, 3.18 (±0.03) MHz, and 30.05%, respectively, in the air. The maximum positive acoustic pressure in water, measured at a distance of 7.27 mm, was 40 kPa from the Tm-pMUT annular array driven by a 10 Vpp sine wave at 2.66 MHz without beamforming. The proposed Tm-pMUT annular array using a PMN-PZT single crystal has the potential for various applications, such as a fingerprint sensor, and for ultrasonic cell stimulation and low-intensity tissue stimulation. © 2018 IOP Publishing Ltd.
- Institute of Physics Publishing
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