Example Wafer Used for MEMS Research:
Item #3330
50.8mm P/B <100>, 1-10 ohm-cm, 270µm SSP prime-grade silicon wafer with 300nm thermal oxide.
Silicon Microstructures for MEMS Sensors
Piezoelectric MEMS sensors can combine a precisely fabricated silicon microstructure with a thin piezoelectric film, such as aluminum nitride (AlN). In suitable designs, mechanical vibration is converted to an electrical signal for acoustic sensing and resonator research.
The performance of MEMS resonators depends on substrate material, geometry, wafer thickness, film stress, and mechanical quality factor (Q). In piezoelectric designs, the film’s piezoelectric response and electromechanical coupling are also important. Together these choices affect resonance frequency, loss, and device sensitivity.
UniversityWafer supplies prime-grade silicon wafers, SOI wafers, thermal oxide wafers, and silicon nitride substrates for MEMS fabrication, thin-film deposition, and acoustic resonator research.
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Learn About Wideband Spectrum Sensing
Watch the video below to learn how MEMS acoustic resonators and piezoelectric devices are being developed for efficient wideband spectrum sensing and next-generation wireless communication systems.
What Are MEMS-Based Acoustic Resonators?
MEMS-based acoustic resonators are microfabricated devices that use mechanical vibration to filter, sense, or generate signals at specific frequencies. These devices are often built on silicon wafers because silicon offers excellent mechanical stability, precise microfabrication compatibility, and well-controlled electrical properties.
In many MEMS resonator designs, a silicon microstructure is combined with insulating layers, electrodes, and sometimes a piezoelectric film. The resonator vibrates at a target frequency determined by device geometry, material properties, and deposited thin films. Related acoustic wave devices may use different substrate and electrode layouts.
Silicon and Oxide Wafers for MEMS Resonator Research
Researchers have purchased thermal oxide coated silicon wafers for MEMS acoustic resonator fabrication and process development.
Why Wafer Properties Matter
For MEMS acoustic resonators, substrate specifications affect fabrication and can influence resonance behavior. Wafer factors include crystal orientation, resistivity, thickness, flatness, surface roughness, oxide thickness, and compatibility with thin-film deposition, photolithography, or etching processes.
Silicon is commonly selected because it can be etched into precise resonant structures using MEMS fabrication methods. A thermal oxide layer can provide electrical insulation, masking, or surface passivation during device processing.
Common Applications
MEMS acoustic resonators are studied for RF filter and timing applications, as well as selected sensing and wireless systems. Device structures differ across bulk acoustic, surface acoustic, and micromechanical resonators; substrate selection must follow the intended wave mode and fabrication process.
Popular Substrates for MEMS Acoustic Devices
- Silicon wafers for resonant microstructures and MEMS process development
- Thermal oxide wafers for insulation, masking, and passivation
- SOI wafers for suspended structures and thickness-controlled device layers
- Low-stress silicon nitride coated wafers for membranes, masking, and structural layers where film stress matters
- Sapphire substrates for selected acoustic or RF stacks with a separately deposited piezoelectric film
Choosing the right substrate helps researchers control resonance frequency, acoustic loss, electrical isolation, and device reliability during MEMS acoustic resonator fabrication.