Semi-Insulating Silicon Wafers
Can you do Si wafers with a thickness of 150 microns, with a thickness tolerance of +/- 2 to 3 microns? We would want 6-8 inch diameter, semi-insulating.
The number 1 question is – can you hold the tolerance on thickness that tightly? If the answer is “no” then nothing else matters.
If yes, them we might need 10-20 wafers this year for development, and then for the product, maybe 50-100 wafers per year.
We aren’t so much looking for a quote, as just trying to figure out feasibility. If you need some additional specs in order to figure out if you can maintain the tolerance, let me know, and I will find out the answers.
We can do 6" diameter, 150um+/-1micron thickness!
Reference #134155 for specs and pricing.
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Semi-Insulating Gallium Arsenide (GaAs) Substrates
A PhD candidate requested a quote for the following.
We are keen to purchase low-temperature MBE grown semi-insulating GaAs epitaxial wafers. Please advise whether your company offers this product.
We need just a few GaAs wafer with a diameter of 60 mm and thickness 600 um and purity should be 99.99 (please advice me on purity as I dont know about the possible purity in GaAs) and it should be semi-insulating. Please tell me how much each wafer will cost with above dimensions and purity and how long will it take you to give it?
UniversityWafer, Inc. Quoted:
The fact that the wafers are to be Semi Insulating, which means with resistivity > 10 MegaOhmcm, implies purity better that 99.9999%.
We have in stock wafer that are 76.2mm in diameter and wafers which are 50.2mm in diameter.
- We can make wafers that are Semi Insulating undoped GaAs:-[100] that are 60.0mm in daimeter.
For us to quote, you have to specify also:
- Wafer thickness (500um is reasonable)
- Are the wafers to be polished, and if so then One-side-polished or Both-sides-polished?
- Should the wafers be with one or two Flats, or with NO Flats (perfectly round)?
- How many wafer do you need (5 is a minimum, and price is very sensitive to quantity)
Reference #90529 for specs and pricing.
Semi-Insulating Silicon Carbide Substrates
A materials scientist requested a quote for the following.
Does University Wafer carry 2" SiC wafers? Specifically: 4H-SiC,high-purity semi-insulating, research grade, 2" dia., on-axis, >1E5 ohm-cm, both sides polished / silicon face epitaxy ready with CMP finish Do you have a price list for 2" wafers?
UniversityWafer, Inc. Replied:
Yes we do! Reference #98030 for specs and pricing.
Semi-Insulating Gallium Nitride Wafers
A postdoc requested a quote for the following.
We need 3" (111) 400 micron thick SSP Gallium Nitride Wafers.
This is for MOCVD growth of (0001) GaN. We require semi-insulating (111) substrates.
Reference #97969 for specs and pricing.
Undoped Semi-Insulating Silicon-on-Insulator (SOI) Wafers
A senior process engineer requested a quote for the following.
We need to know if you have semi-insulating SOI device layer with high resitivity about 10000ohmcm , (10K). the size could be from 2 inch to 4 inch and we need about 5 wafers. we also need to have some estimation of the price.
Reference #170305 for specs and pricing.
What Does Semi-Insulating Mean?
In semiconductors, semi-insulating (SI) refers to a material that has a very high electrical resistivity, typically in the range of 10610^6 10 6 to 101010^{10} 10 10 Ω\Omega Ω-cm or higher. While not a perfect insulator, it significantly restricts the flow of electrical current compared to standard semiconductors.
Key Characteristics of Semi-Insulating Materials:
- High Resistivity: Semi-insulating semiconductors are engineered to have minimal free charge carriers, making them behave more like an insulator.
- Compensated Doping: Achieved by introducing deep-level dopants (e.g., Cr in GaAs, Fe in InP) or by using intrinsic defects to trap free carriers and maintain charge neutrality.
- Used for RF and Microwave Applications: SI substrates are critical for high-frequency and optoelectronic devices since they reduce parasitic conduction and signal loss.
- Common Materials:
- GaAs (Gallium Arsenide): SI GaAs is widely used in RF and microwave circuits.
- SiC (Silicon Carbide): Used in high-power electronics and RF applications.
- InP (Indium Phosphide): Used in optoelectronic and high-speed communication applications.
Applications:
- RF and Microwave Circuits: Helps prevent signal interference.
- Optoelectronics: Used in LEDs, lasers, and photodetectors.
- Power Electronics: Reduces leakage currents in high-voltage devices.
Would you like a deeper explanation of how semi-insulating properties are achieved in a specific material?
Examples of Semi-Insulating Materials
| Material |
Typical Dopant/Method |
Key Applications |
| GaAs (Gallium Arsenide) |
Fe-doped or high-purity |
MMICs, RF, photonics |
| InP (Indium Phosphide) |
Fe-doped or undoped |
Optical communication, quantum tech |
| GaN (Gallium Nitride) |
Undoped or Fe-doped |
Power electronics, RF |
| SiC (Silicon Carbide) |
Vanadium (V) doped or high-purity |
Power devices, quantum computing |
Would you like more details on fabrication methods or a comparison between these materials?
Zn-Doped Epi-Films On Semi-Insulating Wafers
A research scientist requested a quote for the following.
Could you supply a quote for:
2” GaAs (100) with Zn doping (~1E18/cm3)? These could be either bulk crystals at this doping level or Zn-doped epifilms (several microns thick) on semi-insulating wafers. We would also like these to be As capped.
In addition, if you have CdTe (10mm x 10mm x 1mm) (001) orientation, 1-side polished, including in the quote would be great.
UniversityWafer, Inc. Quoted:
Item Qty. Description
BH08. 5 Gallium Arsenide wafers, P/E 2"Ø×400±25µm, p-type GaAs:Zn[100]±0.5°, Nc=~1E18/cc, One-side-polished, back-side matte etched, US Flats.
Reference #124856 for specs and pricing.
What Are All Semi-Insulating Substrates?
- Semi Insulating Indium Phosphide (InP): Semi-insulating Indium Phosphide (InP) is used in high-
frequency electronics, MMICs, RF transistors, and optoelectronics. It’s fabricated via Fe doping or high-purity methods.
- Semi-Insulating Gallium Nitride (GaN): is widely used in high-power, high-frequency, and
optoelectronic applications due to its wide bandgap, high thermal conductivity, and excellent electron mobility.
- Semi-Insulating GaAs Substrate: are high-purity, resistive wafers used in high-frequency, high-power, and
optoelectronic applications. Unlike conductive GaAs, semi-insulating GaAs has high resistivity (>10⁷ Ω·cm), making it ideal for devices requiring excellent electrical isolation.
- Semi-Insulating Silicon Carbide Wafer (SiC): are specialized materials used for high-power, high-
frequency, and radiation-resistant electronic applications. Unlike conductive SiC, semi-insulating SiC has high resistivity (10⁶ – 10⁹ Ω·cm), making it ideal for devices requiring electrical isolation and thermal stability.
- Semi-Insulating Semiconductor: A semi-insulating semiconductor is a type of semiconductor material that has very high electrical resistivity (typically >10⁶ Ω·cm), making it behave more like an insulator than a conductor under normal conditions. However, unlike true insulators, it can still support charge carrier movement under certain conditions, such as at high voltages or when externally doped.
