Thickness Dependence of crack initiation and propagation in stacks for piezoelectric microelectromechanical systems

Piezoelectric thin films are vulnerable to fracture, which results in degradation of the structural integrity and device performance in piezoelectric microelectromechanical systems (PiezoMEMS). This work explains the fracture process as a combination of a crack initiation event in the piezoelectric film followed by crack propagation through the remaining layers. Biaxial bending tests using the Ball-on-three-Balls (B3B) technique were performed on stacks containing Pb(Zr0.52Ti0.48)O3 (PZT) thin films of varying thicknesses grown on Si wafers (coated with thin LaNiO3/SiO2 layers). The fracture initiates in the PZT film, arrests in the compressive SiO2 layer, prior to failure of the Si substrate. Weibull analyses show a significant effect of the thin film thickness on the stack's strength; the characteristic strength and Weibull modulus being σ0 ∼1110 MPa and m ∼28, σ0 ∼1060 MPa and m ∼26, and σ0 ∼880 MPa and m ∼10 for the 0.7 µm, 1.3 µm, and 1.8 µm film stack, respectively and σ0 ∼ 1820 MPa and m ∼3 for the Si wafer. A stress-energy criterion using finite fracture mechanics explains the dependence of crack initiation load on the PZT layer thickness, whereas linear elastic fracture mechanics is employed to rationalize crack propagation through the stack.

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Work Title Thickness Dependence of crack initiation and propagation in stacks for piezoelectric microelectromechanical systems
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Open Access
Creators
  1. Kathleen Coleman
  2. Raul Bermejo
  3. Dominique Leguillon
  4. Susan Trolier-McKinstry
License In Copyright (Rights Reserved)
Work Type Article
Publisher
  1. Acta Materialia
Publication Date June 1, 2020
Publisher Identifier (DOI)
  1. https://doi.org/10.1016/j.actamat.2020.03.030
Deposited December 08, 2021

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  • Added Thickness_Dependence_of_Crack_Initiation_and_Propagation_in_Piezoelectric_Microelectromechanical_Systems-ActMat-2020.pdf
  • Added Creator Kathleen Coleman
  • Added Creator Raul Bermejo
  • Added Creator Dominique Leguillon
  • Added Creator Susan Trolier-McKinstry
  • Published
  • Updated
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