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research article

Thin film piezoelectrics for MEMS

Trolier-McKinstry, S.
•
Muralt, P.  
2004
Journal of Electroceramics

Thin film piezoelectric materials offer a number of advantages in microelectromechanical systems (MEMS), due to the large motions that can be generated, often with low hysteresis, the high available energy densities, as well as high sensitivity sensors with wide dynamic ranges, and low power requirements. This paper reviews the literature in this field, with an emphasis on the factors that impact the magnitude of the available piezoelectric response. For non-ferroelectric piezoelectrics such as ZnO and AlN, the importance of film orientation is discussed. The high available electrical resistivity in AlN, its compatibility with CMOS processing, and its high frequency constant make it especially attractive in resonator applications. The higher piezoelectric response available in ferroelectric films enables lower voltage operation of actuators, as well as high sensitivity sensors. Among ferroelectric films, the majority of the MEMS sensors and actuators developed have utilized lead zirconate titanate (PZT) films as the transducer. Randomly oriented PZT films show piezoelectric e(31, f) coefficients of about - 7 C/m(2) at the morphotropic phase boundary. In PZT films, orientation, composition, grain size, defect chemistry, and mechanical boundary conditions all impact the observed piezoelectric coefficients. The highest achievable piezoelectric responses can be observed in {001} oriented rhombohedrally-distorted perovskites. For a variety of such films, e(31,f) coefficients of - 12 to - 27 C/m(2) have been reported.

  • Details
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Type
research article
DOI
10.1023/B:JECR.0000033998.72845.51
Web of Science ID

WOS:000222448000002

Author(s)
Trolier-McKinstry, S.
Muralt, P.  
Date Issued

2004

Published in
Journal of Electroceramics
Volume

12

Issue

1-2

Start page

7

End page

17

Subjects

piezoelectrics

•

mems

•

thin films

•

orientation

•

lead-zirconate-titanate

•

morphotropic phase-boundary

•

pb(yb1/2nb1/2)o-3-pbtio3 epitaxial-films

•

microelectromechanical filters

•

electrical-properties

•

crystal orientation

•

radio-frequency

•

sputtered zno

•

zr/ti ratio

•

temperature

Note

Trolier-McKinstry, S Penn State Univ, Mat Res Inst, University Pk, PA 16802 USA Penn State Univ, Mat Res Inst, University Pk, PA 16802 USA Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA Swiss Fed Inst Technol, EPFL, Ceram Lab, CH-1015 Lausanne, Switzerland

834YY

Cited References Count:77

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LC  
Available on Infoscience
August 21, 2006
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/233548
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