"I am a student at Georgia Tech. I need Si wafers (4 inch) for making molds for microfluidic devices. SU 8 2000 will be used as photoresist. I will be curing PDMS using these molds. Do you have any particular wafer for this purpose, or any suggestions?"
How much does a 4 inch silicon wafer cost?
UniversityWafer, Inc. prides itself on providing our clients with the highest quality wafers at the lowest cost. In fact, you can buy as few as one silicon wafer here.
How we help researchers: A Typical Case Study
Please reference #201972 for specs/pricing.
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Large Selection of 4 Inch Silicon Wafers In Stock
Choosing a suitable silicon wafer is essential for semiconductor research. UniversityWafer, Inc.'s 100mm silicon wafers are a popular choice for researchers and semiconductor fabrication because they offer a good balance of performance and price. Our silicon wafers are perfect for prototyping and small-scale production, and we offer a variety of thicknesses and finishes to meet the need of researchers.
Below Are Just Some of the 4 Inch Silicon Wafers that We Carry
We have a large selection of standard and hard-to-find specs in stock. We work with the researcher to provide the best specs for their research. Fast delivery is a must!
Wafer Dopings:
- Undoped Silicon
- Boron (B) - P-type
- Gallium (Ga)
- Arsenic (As) - N-type
- Antimony (Sb) - N-type
- Degenerately Doped
Wafer Types
Wafer Orientations
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Silicon Wafers to Transfer 2D Materials
A researcher contacted us for a quote:
Researcher Request: "I am looking for 4'' silicon wafers with a high quality 90 nm-thick dry thermal silicon oxide, i.e., with a high breakdown voltage."
Why 90nm? "For this 90nm wafer, I use it for transferring 2D materials and getting the layer number information from the optical contrast under an optical microscope. In general, 2D research groups use 90nm SiO2/Si because it gives the best optical contrast as a function of layer numbers."
UniversityWafer, Inc. Recommendation:
For high breakdown voltage, see: "J.M Soden, The dielectric strength of SiO2 in a CMOS transistor structure". We recommend our Dry Thermal Oxide Wafers.
Quote Example (Item GY86):
25 Silicon wafers, per SEMI Prime, OxP/EOx 4"Ø×460±20µm,
P/B[100]±0.5°, Ro=(8-12)Ohmcm,
TTV<5µm, Bow<10µm, Warp<20µm,
One-side-polished, back-side Alkaline etched (both with oxide),
Dry thermal oxide: 90±6nm,
2 Flats, Sealed in Empak cassette.
What is The Thickness of 4 Inch Silicon Wafers?
The thickness of a 4 inch silicon wafer can vary depending on its specific application and manufacturing process. However, as a general guideline, the standard thickness for a 4 inch silicon wafer is around 525 micrometers (0.525 millimeters or 0.0207 inches).
We can also provide ultra-thin silicon wafers or thick wafers customized to meet specific requirements.
Where Can You Buy 4 Inch Silicon Wafers Online?
Even with larger silicon sizes (like 300mm/12 inch) available, 4 inch wafers are still ubiquitous for researching electronic devices and semiconductors. The popularity of 4 inch (100mm) remains robust because the tooling required to fabricate semiconductors is very expensive. Legacy systems still work fine, so clients choose the much easier to use and store 4 inch silicon as their first choice for research and low volume production.
4 Inch Silicon Wafers History & Market
Major manufacturers like SUMCO have expanded production facilities to meet demand. 100mm wafers are critical for specific legacy applications and university research labs where upgrading to 200mm or 300mm tools is cost-prohibitive. Silicon Wafers from UniversityWafer, Inc. offer the "gold standard" for research applications.
Pricing: Bare Silicon wafer pricing varies by grade. Test grade wafers are the most economical option for setting up tools or running non-critical experiments.
Sizes: While wafers go up to 450mm, we specialize in 3 inch, 4 inch, 6 inch, and 8 inch diameters suited for research lithography tools.
Which Silicon Wafer is Stable at High Temps?
Customer Question: "Could you recommend a Si wafer for me that is stable at high temps (1000°C) and won't have any change of resistance after heat treatment?"
UniversityWafer Answer:
1) Stability: Every silicon wafer is stable at 1,000°C. However, some dopants (especially Arsenic and Antimony) may outgas.
2) Resistance Changes: Resistivity of CZ crystallized Silicon doped with Boron may change depending on cooling rates (due to precipitating Boron-Oxide compounds). For high-temperature stability without resistance change, we recommend Undoped or Phosphorus-doped (N-type) Silicon wafers.
4 Inch Wafers for Sputter Etch Processes
We are fully equipped to handle custom coating requests. Our capabilities include:
- Electron Beam Evaporation: (MOQ 8 wafers)
- Sputtering: (MOQ 1 or 22 wafers)
- LPCVD & PECVD: (MOQ 25 wafers) - Excellent for Silicon Nitride or Oxide.
- Wet Processes: We perform SC-1, SC-2 cleans, and HF dips.
Depending on the coating mechanism, we can deposit up to 7 different metals in one reactor run without breaking vacuum.
4 Inch Wafers for Mesoporous Silicon Nanoparticles
Scientist Request: "We're looking for Prime CZ p-doped, single side polished, 0.001-0.0005 ohm-cm, (100) orientation. We're planning to pilot study mesoporous silicon nanoparticle production using HF galvanostatic production."
Contact us for pricing on Reference #266807
What are Mesoporous Silica Nanoparticles?
Mesoporous Silica Nanoparticles possess high surface areas, enabling them to load diverse cargos. They are widely used in nanomedicine, biotechnology, and diagnostics.
What is HF Galvanostatic Charging?
HF galvanostatic charging is an electrochemical method used to create porous structures in silicon. It involves using an electric current in a Hydrofluoric Acid (HF) solution. Highly doped P-type wafers (Boron) are often preferred for this process to achieve specific pore sizes.
Summary: What are 4 Inch Silicon Wafers?
A 4 inch silicon wafer is a circular disk of pure crystalline silicon, typically 100mm in diameter and ~525µm thick. They serve as the substrate for microelectronic devices, solar cells, and MEMS. UniversityWafer, Inc. supplies these in Single Crystal form for high-purity applications.