Undoped / Intrinsic Float Zone Silicon Wafers for Researcher

university wafer substrates

We have all diameter of Undoped Silicon Wafers and quantities

Typical Researcher request:

"We need undoped silicon.  Size: about 25mm, 25.4mm or similar Thickness: 1mm Si Wafer, 1-1-1, optical grade (intrinsic Rs>2000Ohm cm) Need 1 ea. As always, you guys are very responsive. Thank you for your assistance."

Reference #267943 for specs/pricing.

You can buy as few as one wafer!

Get your Undoped Silicon Quote FAST!



undoped silicon wafers

Undoped Silicon for Positron Annihilation Lifetime Spectroscopy Experiment

Researchers often used our low price diced undoped wafers. The specs below were used for their experiment.

10mm x 10mm x 0.525 micron SSP, <100> Undoped, >10,000 ohm-cm

Please let us know if you can use or if you would like us to quote another specs. Price depends on quantity.

Undoped Silicon for Testing Under Heat and Pressured in Contact with a Polymer Sheet

The following specs were used in our clients test. Undoped Si (100), >1,000 ohm-cm. Thickness of 300 micron. The overall dimensions 66 mm x 58 mm x 0.3 mm.

Please ask for a quote.

What Does Undoped Mean?

A novice student researcher asks:

Dear Sir or Madam, we are using silicon wafers from your company (Item# 2272 Silicon, 100mm, Undoped, <100>, >20,000 ohm-cm, 500um, DSP, Prime) and I have a technical question concerning the Si: What means “undoped” together with the high resistivity: Is it a pure “intrinsic” silicon wafer or are embedded “deep-level traps/deep-level defects” responsible for the high resistivity? In the latter case, could you estimate their density? 

A) The wafers are intrinsic silicon wafers. Please let us know if we have answered all of your questions?

What is Silicon Dopant?

Undoped and doped silicon wafer doping explained.


What are Some Undoped Silicon Wafer Applications?

Undoped silicon wafers are wafers made from pure silicon that have not been intentionally doped with impurities. Doping is the process of introducing impurities, such as phosphorus or boron, into the crystal structure of a semiconductor material in order to alter its electrical properties.

In the case of silicon wafers, undoped wafers are typically used as a starting material for the production of microelectronic devices, such as transistors and integrated circuits (ICs). The electrical properties of undoped silicon are characterized by low electrical conductivity, which makes it an insulator.

After an undoped silicon wafer has been processed, it can be used as an insulating layer in microelectronic devices or as a substrate for the growth of thin films. Undoped silicon wafers are also used in the production of solar cells and other photovoltaic devices, as they are able to absorb sunlight and generate electricity.

In addition to their use in microelectronics and photovoltaics, undoped silicon wafers are also used in a variety of other applications, including research and development, and as a starting material for the production of other silicon-based materials.

Light-Activated Millimeter-Wave Switch for 5G Telecommunications Applications

A corporate scientist has used the following high resistiivty silicon wafer to form the main switching mechanism of the light-activated millimeter-wave switch.

Si Item #3225
150mm Undoped <100> >10,000 ohm-cm 675um DSP Prime

How UniversityWafer helps Answer Researcher Undoped Silicon Wafers Questions

Client asks: We are looking for service to check quality of our Float Zone (FZ) silicon

We can prepare samples in rod form, for example diam. x  length :12x (20-40)mm.
We have plan check 30 samples at low temperature (B ; Ph; Sb; Al; As may be you have more possibilities?)And ~30-40 samples of poly and mono silicon at room temperature (O2 & C)We have plan delivery not less 3 pieces for each type of measurements in one delivery give me quotation for such service please.


We can certainly measure Carbon and Oxygen content of your FZ Silicon rod samples. We normally ise a wafer 3mm thick, but we can slice it from your rods. We can do that for polycrystalline and monocrystalline silicon.

We can measure crystallographic orientation and Etch-Pit-Density of your material.
We can also measure type and resistivity of your material, up into 20,000 Ohmcm range. These are significant quality measurements

I do not understand what you mean by "We have plan check 30 samples at low temperature (B ; Ph; Sb; Al; As may be you have more possibilities?)".
Is your FZ Silicon ultra high purity (hence ultra high resistivity) and you want chemical analysis of residual impurities (B, Ph, Sb, As, Al) or do you chemically dope your FZ silicon with these elements and you want to measure the concentration of these elements and resultant resistivity?

To test the quality of your FZ silicon you also should measure Minority Charge Carrier Lifetime and Dominant Charge Carrier Mobility.

Client Replies

Currently now, I interesting in control of Carbon & Oxygen content in samples, which you make from our small rods.
Give me commercial offer for such measurements, please
About concentration of some impurities in FZ siliconAt the low temperature , like temperature clouse to lequid He, possible to check concentration of impurities which I indicated at ppta level. When I ask you about other possibilities, I mean, may be you have methods how check in same conditions (He Temperature) another impurities. We are working with different feedstocks and we looking for such possibilities worldwide.

Plant Response:

I think that now I understand this situation.

FTIR is the best measurement for determining minute quantities Carbon and Oxygen in Silicon.
FTIR measurement at room temperature is adequate to monitor Oxygen in CZ crystallized Silicon.
However, to achieve the sensitivity required to meaningfully measure Oxygen and Carbon in FZ crystallized Silicon, where they are present in much smaller quantities, one needs to do the FTIR measurement at the temperature of liquid Helium.

We have the equipment to do FTIR at liquid Helium temperature, but we have not used it under cryogenic conditions for some time and we would have to purchase a supply of liquid Helium. Also, it is uneconomical to measure one sample at a time. We need to measure a series of samples, while the liquid Helium lasts, for once it boils away, we need to purchase a new bottle.

Given above limitations, if you do want to pursue the matter, we would be happy to cooperate.

Wafer Specs Provided to Client

Item       Qty.   Description
GL22. 1/5/25   Measure by FTIR according to SEMI standards, Carbon and Oxygen content
of FZ Intrinsic undoped Silicon ingots, 12mmØ × (20-40)mm, NO Flats.

Note: The quote is for analysis of 1 or 5 or 25 staples sent together as one package.

Here is another researcher and what he uses undoped silicon wafers for:

"We use the wafer as a beam combiner to get a visible and infrared beam colinear in a nonlinear optical setup. For this, cleaving right angles is very helpful. Polished on both sides is essential as is undoped."

Undoped Silicon Wafer Item Used for bam combinder

Undoped Si Item #3193
100mm Undoped (100) >10,000 ohm-cm 525um DSP Prime

Typical Researcher Request:

"We need Undoped Silicon Wafers with Oxide layer should have a layer of 1 micron. In addition we are going to use them mainly for optical measurements, hence the impurity levels should not be too high."

 Client with our help chose the following wafers:

Undoped Silicon Wafers with Oxide

Item 3225 - 150mm Undoped (100) 650um SSP Test 1um Oxide Silicon Wafer

Item Dia Dopant Ori Res (Ohm-cm) Thick (um) Polish Grade Description
2313 25.4mm Undoped <111> >2000 280um SSP Test Intrinsic FZ
2483 25.4mm Undoped <100> >5000 73.5um DSP Prime FZ, Float Zone
2018 50.8mm Undoped <100> >10000 280um DSP Prime FZ, Intrinsic item
2379 50.8mm Undoped <100> >10000 500um SSP Test Float Zone, Undoped
3133 76.2mm Undoped <100> >5000 Ohm-cm 350um DSP MECH NON-REFUNDABLE, POOR QUALITY. Sold "As-Is"; wafers are covered in streaks, residue, and particles.
3070 100mm Undoped <100> >20,000 500um SSP Prime Intrinsic, Secondary flat SEMI, TTV<10 um, Bow/Warp<30 um
3150 100mm Undoped <100> >10,000 525um SSP Bad Quality HAS PARTICLES!!! NON-REFUNDABLE, POOR QUALITY. Sold "As-Is". FZ (Float Zone)
3193 100mm Undoped <100> >10000 525um DSP Prime TTV: <5um, Bow/Warp: <30um, Flat: 1.

What Are Undoped Silicon Wafers?

Undoped silicon wafers are crystalline forms of silicon that do not contain any dopants. They are considered to be the ideal semiconductor because they consist solely of crystalline silicon. Undoped wafers are also known as intrinsic or intrinsically-doped silicon wafers. These types of wafers are available for immediate delivery, and they are the perfect choice for semiconductors.

Doped silicon wafers are created by adding various dopants to the silicon crystal during its formation. Boron and other elements are common dopants that create P-type and N-type silicon, respectively. The difference between the two types of silicon comes down to the dopants and their concentrations. High levels of dopants produce P-type and N-type wafers. Despite their similarities, they have distinct differences and have different uses.

Undoped silicon wafers are the most commonly used type in electronics and they are the most expensive type. Because they are less expensive than doped versions, they are the preferred choice for semiconductor fabrication. In many cases, they are more suitable for high-end electronic devices. However, they are not always the most cost-effective option for high-end electronic devices. Therefore, it is important to choose the right type of semiconductor for your project.

Doped silicon wafers are increasingly in demand in the electronics industry because they can have different electrical properties. These are essential for manufacturing semiconductors, including transistors and memory chips. Doped silicon wafers have an advantage over undoped ones, as they have a much lower refractoriness rate. Moreover, they have higher electrical conductivity, resulting in a higher efficiency of semiconductors.

Silicon wafers are a popular choice for semiconductor applications. They are ideal for many applications, including electronics. The most common use of doped silicon is in high-end electronics. In addition to the high-performance technology, they are also widely used in medical devices. Aside from semiconductors, undoped silicon wafers are important for the manufacture of electronic circuitry. Aside from being useful in the electronics industry, they can be valuable in the electronics industry.

A silicon wafer is a thin slice of pure crystallized silicon. The term undoped silicon wafers describes a purely pure semiconductor. Undoped silicon is the most popular type of semiconductor. They are also called intrinsic silicon wafers. The former is more expensive than doped, while the latter is considered the more valuable type. You can buy undoped silicon in any quantity.

Doped silicon wafers are crystalline forms of silicon that are doped. Dopants are chemicals that are added to semiconductors, which make them more valuable. These chemicals are called dopants. Undoped silicon wafers are made up of silicon, which is the ideal semiconductor. During its production process, these compounds are added to the silicon crystal. These elements are essential in the manufacturing process.

Doped silicon wafers are used in semiconductors for their electrical properties. They are more expensive than unsaturated silicon wafers, but they are often more expensive. Because of their low cost, they are an excellent option for semiconductors. You can find these wafers online, and they are also available in other types of semiconductor. You can even buy undoped ones from a semiconductor manufacturer in your area.

Silicon is the most common material in the world and it plays an important role in electronic circuitry. There are two kinds of silicon wafers - the undoped ones and the doped ones. They differ in their chemical composition, but are both pure, crystalline silicon. If you're looking for a semiconductor, the best option is an undoped one. But if you're not sure what type to choose, a doped one is a good option.

The cheapest undoped silicon wafer is typically only a few millimeters thick, and is made of silicon. The other type is called a virgin silicon wafer. These are the most expensive type, so they're more expensive than doped ones. But if you're looking for the best quality silicon wafers, it's best to get one that has high-quality bare silicon. Then, you can do your own research and develop new products and applications.