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Contribution of Ribbon-Structured SiO2 Films to AlN-Based and AlN/Diamond-Based Lamb Wave Resonators.

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New resonator designs using aluminum nitride (AlN) and silicon dioxide (SiO2) achieve high performance and temperature compensation. These structures are ideal for robust sensing applications in harsh environments.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Acoustics

Background:

  • Resonating structures are crucial for various electronic applications.
  • Aluminum nitride (AlN) thin films are widely used due to their piezoelectric properties.
  • Silicon dioxide (SiO2) is often employed for structural and passivation layers.

Purpose of the Study:

  • To theoretically analyze new designs for AlN-based Lamb mode resonators.
  • To investigate the impact of SiO2 structural elements on resonator performance.
  • To achieve temperature-compensated, high-performance resonator structures.

Main Methods:

  • Finite Element Method (FEM) for theoretical analysis.
  • Comparison of different interdigital transducer (IDT) configurations.
  • Variation of structural parameters and boundary conditions.

Main Results:

  • Structured SiO2 capping significantly enhances resonator performance compared to continuous layers.
  • Ribbon-structured SiO2 capping enables temperature-compensated, high-performance resonators.
  • Addition of a diamond layer further improves velocity, electromechanical coupling, and membrane solidity while maintaining zero TCF.

Conclusions:

  • Novel AlN resonator designs with structured SiO2 capping offer superior performance.
  • These structures exhibit excellent temperature compensation and robustness.
  • The passivation benefits make these resonators highly suitable for sensing in harsh environments.