Undoped Silicon Wafers Inventory

university wafer substrates

Buy Undoped Silicon Wafers Online and Save!

A Graduate Research Assistant requested the following quote:

We need 4" undoped silicon wafers with oxide amounts:
20nm, 50nm, 100nm, 150nm, 200nm, 250nm.

All need to be made from the same "boule"?

 Could you specify the price for 4" undoped Si wafers made from the same boule, and with [100] orientation? In other words, the same wafer we discussed but without the oxide layer.

Reference #210773 for specs and pricing.

Up to 20,000 ohm-cm available!

UniversityWafer, Inc's Undoped Silicon Wafers are the most widely used type of semiconductor because they offer the best balance of performance and price. While a Doped Silicon Wafer is better for electronics, an Undoped Silicon one is better for medical devices. Buy as few as one wafer to test.

Get Your Quote FAST! Or, Buy Online and Start Researching Today!


Typical Client Question regarding Undoped Silicon Wafers

After looking at your online store, I think we might go with your cheapest silicon wafers, product ID 444. I am in a group that is working on a Senior Design Project to create a biobattery. We need a substrate to pattern with photolithography and subsequently deposit various precious metals on that will catalyze certain reactions and conduct electricity. If you have any advice on specific types of wafers we will need for such nano electronic devices I would be happy to know. Thanks.

We make nanomaterials in our lab and one approach is using electrical explosion of wires (EEW). We used one of Scott's old Si wafers (doped with B) and broke off a strip of Si that we attached to electrodes in our EEW apparatus. It worked nicely and we are looking to do the same thing with Ge (Germanium Wafer). We need a wafer that is less than 500 microns thick. Fill out the form and receive an immediate quote. See bottom of page for recent Silicon Wafers specials.

Undoped Silicon Wafers In Stock

Below are just some of the undoped silicon wafers that we have for immediate delivery.
Buy as few as one wafer!

ID Diam Dopant Orien Res (Ohm-cm) Thick (um) Polish
2313 25.4mm Undoped <111> >2000 280um SSP
2483 25.4mm Undoped <100> >5000 73.5um DSP
2018 50.8mm Undoped <100> >10000 280um DSP
3032 100mm Undoped <100> 1000-3000 500um SSP
3193 100mm Undoped <100> >10000 525um DSP
3328 100mm Undoped <100> >20,000 525um SSP
3225 150mm Undoped <100> >10,000 675um DSP

What Are Undoped Silicon Wafers Used For?

Among the three basic types of semiconductors, Undoped Silicon Wafers (SiW) are the most widely used. Although they are more expensive than their doped counterparts, they are still considered to be the best semiconductors. While a Doped Silicon Wafer is better for electronics, an Undoped Silicon one is better for medical devices. Find out which type is right for you. If you don't know, you can always ask for samples.

As their names suggest, doped silicon wafers are created by adding a dopant to silicon during the formation process. Boron, for example, creates a P-type material while other elements create a N-type material. Both types are ideal semiconductors, but their properties differ. Doping a semiconductor can make it more sensitive to electric currents, but it will also increase its cost.

Doped silicon wafers are fabricated by adding impurities to a pure silicon crystal. The addition of boron creates a P-type material, while other elements can create an N-type material. This is a good choice for semiconductors, because it produces the highest level of electrical conductivity. Unlike doped materials, an Undoped Silicon Wafer is perfect for manufacturing semiconductor devices.

A doped silicon wafer is created by introducing dopants to the silicon crystal during its formation. Doping is commonly done with boron or other elements to create an N-type material. The dopants in a P-type silicon wafer contribute to the semiconductor's ability to conduct electricity. An N-type silicon wafer, on the other hand, contains a negatively charged electron. These different types are classified as degenerate or intrinsic, depending on the concentration of dopants.

Why are Undoped Silicon Wafers Nominally N-type

semiconductor #doping #type

An intrinsic semiconductor, also called an undoped semiconductor or i - type semiconductor, is a pure semiconductor without any significant dopant species present. [0]

An extrinsic semiconductor is a semiconductor that has been doped, that is, into which a doping agent has been introduced, giving it different electrical properties than the intrinsic ( pure ) semiconductor. [0]

A semiconductor doped to such high levels that it acts more like a conductor than a semiconductor is referred to as a degenerate semiconductor. [7]

An n - type ( negative - type ) extrinsic silicon semiconductor is a semiconducting material that was produced by doping silicon with an n - type element of Group V A, such as P, As, or Sb. [0]

In semiconductor production, doping is the intentional introduction of impurities into an intrinsic semiconductor for the purpose of modulating its electrical, optical and structural properties. [7]

We can custom make wafers in small quantities. We can dice them, thin them to 2um. We have undoped, low doped and highly doped Silicon substrates that are always in stock.

What Undoped Silicon Wafer Spec is Used for Spectroscopic Measurements?

A university lab manager requested a qutoe for the following undoped silicon wafer.

I need this wafer for spectroscopic measurements inside a cryostat (so it should be thin).

I am trying to avoid any background emission from the substrate. That is why I am looking for undoped silicon wafer.

Do you have an experience with people who are searching for those wafers, what are they usually using?
If not, I guess this one should be good.

Reference #251682 for specs and pricing.

Undoped silicon wafers, also known as intrinsic silicon wafers, are commonly used for a variety of applications, including spectroscopic measurements. The specifications of undoped silicon wafers for such measurements can vary depending on the specific requirements of the spectroscopic technique and the measurement objectives. However, there are several key specifications that are generally important for spectroscopic measurements:

  1. Orientation: The crystal orientation (e.g., <100>, <111>) can affect the surface properties of the wafer and may be chosen based on the specific needs of the spectroscopic method.

  2. Diameter and Thickness: Common diameters include 100mm, 150mm, 200mm, and 300mm. The thickness of the wafer may also be specified to ensure consistent optical properties across the wafer.

  3. Resistivity: For undoped (intrinsic) silicon wafers, the resistivity is typically high, often greater than 1,000 Ohm-cm. High resistivity is important for reducing free carrier absorption in the material, which is beneficial for certain types of spectroscopic measurements.

  4. Surface Finish: A polished surface is usually required for spectroscopic measurements to minimize scattering and reflection losses. The surface should be free of scratches and other defects.

  5. Flatness: Good wafer flatness is important for ensuring uniform contact in setups where the wafer needs to be placed in precise optical paths or in contact with other materials.

  6. Purity: High purity is critical to minimize the presence of impurities that could affect the spectroscopic measurements. This includes minimizing both metallic and particulate contamination.

  7. Oxygen Content: The oxygen content in silicon can affect its optical properties. The specification may vary depending on whether the presence of oxygen is beneficial or detrimental to the specific measurement technique.

  8. Thickness of the Native Oxide Layer: The native oxide layer on the silicon surface can affect the spectroscopic response. Specifications may include the desired thickness of this layer or requirements for its removal before measurements.

For specific spectroscopic applications, additional specifications such as the type of dopant (even for very lightly doped materials), dopant concentration, and crystallographic defects might be relevant. It's essential to consult with the wafer supplier or review the literature related to your specific spectroscopic technique to ensure that the wafer specifications meet your needs.