Order High-Resistivity Silicon Wafers
UniversityWafer supplies high-resistivity and ultra-high-resistivity silicon wafers for RF testing, MEMS devices, quantum platforms, and low-noise sensor development.
We support U.S. laboratories with stock and custom wafers from 25.4 mm to 300 mm, available in float-zone and engineered CZ formats.
Get Your Quote FAST! Or, Buy Online and Start Researching Today!
Available Options
- Float-Zone High-Resistivity Silicon
- Engineered CZ Substrates
- Ultra-High Resistivity >10k Ω·cm
- Double-Side Polished (DSP)
- Thermal Oxide Coatings
Quick Specs
- Resistivity: 100 – 10,000+ Ω·cm
- Diameters: 25.4 mm – 300 mm
- Orientation: <100>, <111>
- Thickness: 200 µm – 725 µm
- Surface: SSP, DSP, Oxide
Product Resources
Related Silicon Wafer Resources
Applications Driving Demand for High-Resistivity Silicon
High-resistivity silicon has become essential in U.S. research programs focused on RF front ends, MEMS sensors, quantum readout systems, and low-noise instrumentation.
- 5G / 6G RF filters and resonators
- High-Q MEMS and inertial sensors
- Quantum and cryogenic circuits
- Precision metrology fixtures
In these systems, even small substrate losses translate into measurable performance degradation.
Supply Chains, Tariffs, and U.S. Sourcing
Tariffs and customs delays can significantly affect specialty float-zone and engineered wafers. For small-volume research orders, imported substrates often carry unpredictable costs.
UniversityWafer mitigates these risks by maintaining U.S.-based inventory and hybrid sourcing strategies that shorten lead times.
What “High-Resistivity” Really Means
High-resistivity silicon is engineered to suppress bulk electrical conduction. This improves isolation, reduces parasitic coupling, and stabilizes noise floors.
- Standard HR: ~100–1,000 Ω·cm
- High HR: 1k–7k Ω·cm
- Ultra HR: >7k–10k+ Ω·cm
Most HR wafers are undoped or lightly doped float-zone materials, though compensated CZ wafers are increasingly used.
Float-Zone vs Engineered CZ Substrates
Float-Zone Silicon
Float-zone wafers offer low oxygen content, high purity, and excellent RF performance. They remain the preferred choice for many sensitive measurements.
Engineered CZ Silicon
Czochralski wafers can be processed to achieve high resistivity at lower cost, especially for large diameters and pilot production.
Surface Finish and Polishing for Precision Work
For optics, MEMS, and calibration standards, surface quality matters as much as resistivity.
- Double-side polishing improves thickness uniformity
- Lower roughness reduces scattering and noise
- Improves lithography repeatability
DSP high-resistivity wafers are common in U.S. metrology labs.
Wafer Size Selection in U.S. Cleanrooms
Tool compatibility strongly influences wafer choice in university and national lab facilities.
- 1–2 inch: Test structures
- 3 inch: MEMS / optics
- 4 inch (100 mm): Primary R&D
- 150–200 mm: Pilot lines
Maintaining access to multiple diameters allows researchers to scale gradually.
Combining HR Silicon with Functional Layers
Many sensitive devices require additional layers deposited on high-resistivity substrates.
- Thermal oxide for isolation
- ITO for optoelectronics
- Graphene and 2D materials
- Metal stacks for contacts
Low-loss substrates preserve performance in hybrid structures.
Practical Specification Checklist
- Target resistivity band
- Orientation and thickness
- Surface polish requirements
- Coating needs
- Quantity and delivery timeline
Ordering small mixed lots is often the fastest way to optimize performance.
Conclusion
High-resistivity silicon wafers form the foundation of modern RF, MEMS, quantum, and precision measurement systems in the United States.
By selecting the right resistivity, surface finish, diameter, and sourcing strategy, research teams can significantly improve measurement stability and device performance.