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Characterization of sol-gel Pb(Zr0.53Ti0.47O3) in thin film bulk acoustic resonators.
Journal article

Characterization of sol-gel Pb(Zr0.53Ti0.47O3) in thin film bulk acoustic resonators.

  • Conde J Department of Materials Science, Ecole Polytechnique Federale de Lausanne (EPFL), Switzerland. janine.conde@epfl.ch
  • Muralt P
  • 2008-07-05
Published in:
  • IEEE transactions on ultrasonics, ferroelectrics, and frequency control. - 2008
Acoustics
Computer Simulation
Equipment Design
Equipment Failure Analysis
Gels
Lead
Materials Testing
Models, Chemical
Titanium
Transducers
Vibration
Zirconium
English The behavior of {f111g}-textured Pb(Zr(0.53Ti0.47O3) (PZT) deposited by the sol-gel technique in thin film bulk acoustic resonators (TFBAR's) was investigated at a resonance frequency of about 1 GHz. The resonators were fabricated on Si wafers using deep silicon etching to create a membrane structure and using platinum as top and bottom electrodes. The best response of the resonators was observed at a bias voltage of -15 kV/cm with values of about 10% for the coupling constant and about 50 for the quality factor. This voltage corresponds to optimal values of piezoelectric constant d33 and dielectric constant measured as a function of the electric field. The influence of a bias voltage on the resonance frequency, antiresonance frequency, and coupling constant were observed. Both the resonance and antiresonance frequency show a hysteretic change with applied bias. This effect can be used to shift the whole band of a filter by applying a voltage. The TFBAR structure also allowed us to extract values for materials parameters of the PZT film. Dielectric, piezoelectric, and elastic properties of the f111g-textured PZT film are reported and compared to direct measurements and to literature values.
Language
  • English
Open access status
closed
Identifiers
Persistent URL
https://sonar.ch/global/documents/96813
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