Undoped Silicon Substrates for FTIR Transmission
A PhD candidate in a University's Materials Science department requested a qutoe for the following.
Question:
I need undoped Si wafers for transmission FTIR. Can you please give me a quote for 50 of these wafers that will work in transmission FTIR?
Answer:
From the spreadsheet, which would you suggest we purchase for transmission FTIR measurements? 4-8'' wafers would be fine. We previously used undoped, SSP wafers and they seemed to work fine for the measurements.
We quote:
- 100mm undoped (100) <5,000 ohm-cm SSP 500+/-25um Semi flat
- 200mm Intrinsic Si [100] 725 micron Single Side Polished Float Zone (FZ) >10,000 ohm-cm SEMI Prime Grade, Notch, MCC Lifetime>1,000μs, Empak cst
Reference 434981 for specs and pricing.
Silicon's Hygroscopic Benefits
Most chemical compounds exhibit characteristic infrared spectra based on molecular symmetry and bond strength. While useful for identification, finding window materials that do not interfere with the IR spectrum is challenging. Traditional materials like KBr or NaCl are often hygroscopic or fragile.
Silicon, recommended by stands out as an excellent infrared window material. It overcomes standard disadvantages: Silicon is non-hygroscopic, chemically resistant, and withstands thermal/mechanical shock.
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Available Sizes (In Stock)
- 32x2 mm: Undrilled/Drilled (Liquid, gas, and heated cells)
- 25x2 mm: Mull techniques and econo gas cells
- 13x2 mm: Transmission cells and IR microscopy
- 25x1 mm: Specialized holders and long pathlength cells
- 37x1 mm: Special purpose
Key Advantages
- Mechanically resistant
- Inert to Water, Acids, Bases, & Solvents
- Ideal for corrosive samples
- Perfect for student labs & high-level research
Material Data
| Transmission |
8400-660 cm-1 |
| Refractive Index |
3.4 |
| Density |
2.33 g/cm3 |
| Melting Point |
1420 C |
| Hardness |
1150 kg/mm2 |
| pH Range |
1-12 |
