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Wafer-Level Vacuum-Packaged Electric Field Microsensor: Structure Design, Theoretical Model, Microfabrication, and

Jun Liu1,2, Shanhong Xia1,2, Chunrong Peng1

  • 1State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China.

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Summary
This summary is machine-generated.

This study introduces a novel wafer-level vacuum-packaged electric field microsensor (EFM) with high performance and low power. The innovative design utilizes a silicon-on-insulator conductive handle layer for efficient electric field sensing.

Keywords:
MEMSelectric field microsensorstructural capacitance modelwafer-level vacuum packaging

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Area of Science:

  • Microelectromechanical systems (MEMS)
  • Sensor technology
  • Solid-state physics

Background:

  • Electric field microsensors (EFMs) are crucial for various applications.
  • Existing EFMs often face challenges with performance, power consumption, and manufacturing complexity.
  • Need for advanced microsensors with improved sensitivity, stability, and efficiency.

Purpose of the Study:

  • To propose and demonstrate a novel wafer-level vacuum-packaged electric field microsensor (EFM).
  • To achieve high quality factor, low driving voltage, low noise, and low power consumption.
  • To validate the performance through theoretical modeling and experimental characterization.

Main Methods:

  • Utilized a silicon-on-insulator (SOI) conductive handle layer as the sensing channel.
  • Implemented wafer-level vacuum packaging via anodic bonding between SOI and glass-on-silicon (GOS).
  • Developed a theoretical model to analyze packaging parameters and conducted experimental performance characterization.

Main Results:

  • Achieved a high quality factor (>5000) sustained over 50 days.
  • Required only 0.05 Vp AC driving voltage with 4.2 mV feedthrough under 5 V DC bias.
  • Demonstrated a sensitivity of 0.16 mV/(kV/m) within the 0-50 kV/m range, with 1.62% linearity.

Conclusions:

  • The developed wafer-level vacuum-packaged EFM offers superior performance characteristics.
  • The innovative use of SOI and GOS with vacuum packaging enables efficient batch manufacturing.
  • This EFM is suitable for applications requiring precise and low-power electric field measurement.