Low Stress Nitride on Silicon Wafers 

Low stress silicon nitride (SiN) on silicon wafers is widely used for MEMS fabrication, silicon nitride membranes, KOH etching, TEM grids, photonics, biosensors, and microfluidic devices. LPCVD silicon nitride films provide excellent uniformity, chemical resistance, and controlled film stress, making them ideal for advanced semiconductor, nanotechnology, and research applications.

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Low Stress Silicon Nitride on Silicon Wafers

Low Stress LPCVD Silicon Nitride (SiN) on silicon wafers is widely used in MEMS fabrication, silicon nitride membrane production, microfluidics, biosensors, photonics, and nanotechnology research. The combination of excellent mechanical strength, chemical resistance, and controlled film stress makes silicon nitride one of the most important thin-film materials used in semiconductor processing.

A researcher requested the following quote:

“What substrate should be used to fabricate a silicon nitride membrane using KOH etching? We are interested in evaluating a sample wafer with approximately 100nm thick silicon nitride for membrane fabrication and would like to compare its quality with our current supplier.”

UniversityWafer, Inc. responded:

Low Stress LPCVD Silicon Nitride films typically exhibit less than 250 MPa tensile stress. Film thickness uniformity is generally ±5% depending on substrate quality. For membrane fabrication, window size and geometry are important factors in determining whether standard low stress nitride or a targeted-stress nitride film is recommended.

Reference #205975 for specifications and pricing.

Buy Low Stress Silicon Nitride Wafers Online or request a custom quote for your MEMS, photonics, or nanofabrication project.





Applications of Low Stress Silicon Nitride Wafers

Researchers utilize low stress silicon nitride coated wafers across a broad range of semiconductor, biomedical, and nanotechnology applications. The material's low residual stress helps improve membrane reliability, dimensional stability, and long-term device performance.

  1. MEMS Devices – Low stress SiN films are commonly used in pressure sensors, accelerometers, resonators, microphones, and other microelectromechanical systems that require mechanically stable suspended structures.

  2. Optoelectronics and Photonics – Silicon nitride serves as a protective and dielectric layer in LEDs, laser diodes, optical waveguides, and integrated photonic circuits.

  3. Microfluidics – SiN-coated wafers are used in microfluidic devices, lab-on-chip systems, and biomedical platforms where chemical resistance and durability are critical.

  4. Data Storage Technologies – Silicon nitride films protect magnetic and optical storage devices while improving environmental stability and device longevity.

  5. Biosensors and BioMEMS – Low stress nitride coatings help improve sensor reliability, reduce biofouling, and provide chemically stable surfaces for biological analysis.

Low Stress Silicon Nitride for TEM Grids and Graphene Liquid Cell Research

Low stress silicon nitride membranes are frequently used in transmission electron microscopy (TEM), graphene liquid cell research, and advanced nanoscale imaging applications. The material provides excellent mechanical support while maintaining the thin membrane structures required for electron transparency.

A postdoctoral researcher requested the following specification:

“We are interested in 100mm silicon wafers approximately 200–250µm thick with 150nm low stress silicon nitride. The wafers will be used to fabricate custom TEM grids for a graphene liquid cell project and to optimize membrane geometry.”

Thin silicon wafers coated with LPCVD silicon nitride are commonly selected for custom TEM window fabrication because they provide a stable platform for membrane etching, graphene integration, and nanoscale characterization.

Researchers developing graphene liquid cells often require low stress SiN films to minimize membrane deformation while maintaining excellent mechanical strength during imaging and fluidic experiments.

Reference #220926 for specifications and pricing.

Why Researchers Choose LPCVD Silicon Nitride

LPCVD silicon nitride remains the preferred material for membrane fabrication because it offers excellent film uniformity, low defect density, high chemical resistance, and compatibility with standard semiconductor manufacturing processes. Whether used for KOH etching, MEMS devices, biosensors, TEM windows, or photonic structures, low stress silicon nitride wafers provide a reliable foundation for advanced research and production applications.

Low Stress vs. Super Low Stress Silicon Nitride Wafers

Low stress and super low stress LPCVD silicon nitride (SiN) films are widely used in MEMS fabrication, silicon nitride membrane production, microfluidics, photonics, and semiconductor research. The primary difference between the two materials is the amount of residual tensile stress present in the deposited film.

A nanofabrication engineer requested the following specifications for comparison:

“What is the difference between low-stress and super low-stress LPCVD silicon nitride on silicon wafers? We are evaluating substrates for an RIE etching process and need pricing for multiple configurations.”

  1. 100nm Super Low Stress LPCVD SiN / 500µm Silicon / 100nm Standard SiN
  2. 100nm Super Low Stress LPCVD SiN / 500µm Silicon / 300nm Thermal Oxide

Typical Film Stress Values

  • Low Stress LPCVD Silicon Nitride: Less than 250 MPa tensile stress
  • Super Low Stress LPCVD Silicon Nitride: Less than 100 MPa tensile stress

Reducing residual film stress is critical when fabricating suspended membranes, cantilevers, resonators, pressure sensors, and other MEMS structures. Lower stress levels help minimize wafer bow, membrane deformation, cracking, and device failure during fabrication and operation.

Reference #213220 for specifications and pricing.

Why Low Stress Silicon Nitride is Important for MEMS and Nanofabrication

Silicon nitride is one of the most widely used dielectric materials in semiconductor manufacturing because it provides excellent mechanical strength, chemical resistance, electrical insulation, and thermal stability. Low stress LPCVD silicon nitride films are particularly valuable when fabricating freestanding structures that must maintain dimensional stability after release etching.

Applications that commonly require low stress SiN include:

  • MEMS pressure sensors
  • Accelerometers and resonators
  • Silicon nitride membranes
  • TEM windows and TEM grids
  • Microfluidic devices
  • Photonics and optical waveguides
  • Biosensors
  • Microelectronic packaging
  • RIE and KOH etching research

Researchers often select super low stress films when creating extremely thin membranes or high-aspect-ratio structures that are sensitive to film-induced mechanical deformation.

LPCVD Silicon Nitride Wafer Specifications

  • Film Thickness Range: 50Å to 2µm
  • Thickness Uniformity: ±5% or better
  • Wafer-to-Wafer Uniformity: ±5% or better
  • Film Stress: <250 MPa Tensile Stress
  • Refractive Index: 2.20 ±0.02
  • Wafer Sizes: 50mm, 100mm, 125mm, 150mm, and 200mm
  • Substrate Materials: Silicon, SOI, and Quartz
  • Deposition Method: LPCVD
  • Process Temperature: Approximately 820°C
  • Process Gases: Dichlorosilane (DCS) and Ammonia (NH₃)

Low Stress Silicon Nitride Wafers for TEM Grid Development

Researchers developing custom TEM grids and advanced microscopy platforms frequently use low stress silicon nitride on silicon wafers to evaluate etching rates, membrane performance, and surface chemistry before transferring the process to production-grade TEM membranes.

A nanotechnology researcher requested the following specification:

“We would like low stress LPCVD silicon nitride on silicon wafers with similar Si:N stoichiometry and stress characteristics as our TEM grid membranes. The wafers will be used to develop etching and coating processes before implementation on graphene liquid cell TEM devices.”

UniversityWafer supplied:

  • 100mm Diameter Silicon Wafer
  • Czochralski (CZ) Growth
  • N-Type Phosphorus Doped
  • <100> Crystal Orientation
  • 1–100 Ohm-cm Resistivity
  • 360 ±10µm Thickness
  • Double-Side Polished
  • 10,000Å Low Stress LPCVD Silicon Nitride on Both Sides

Reference #263443 for specifications and pricing.

Silicon Nitride Wafers for Etching, Coating, and Membrane Fabrication

Low stress silicon nitride coated wafers are commonly used for KOH etching, RIE etching, membrane fabrication, microfluidic device development, and photonics research. The combination of high mechanical strength and controlled residual stress makes LPCVD SiN one of the most versatile thin-film materials available for advanced semiconductor and nanotechnology applications.

Whether developing MEMS sensors, graphene liquid cell platforms, silicon nitride waveguides, or freestanding membranes, low stress SiN wafers provide the process stability and reproducibility required for high-performance research and manufacturing environments.

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