Degenerately Doped Silicon

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What is a Degenerately Doped Silicon Wafer?

Below are some example specs that are degenerately doped Si.

Resitivities of

0.01-0.02 ohm-cm

0.001-0.005 ohm-cm

0.0001-0.0005 ohm-cm



Degenerately Doped Silicon acts like a metal!

PHD Candiate asks:

Yes, I am looking for a wafer which have resistivity lower than 1 ohm-cm. In order not to confront an unwanted case in the future, I just want to know what do you mean by "Degenerate Doped Si Wafer" in the description part. Do you want to say the energy difference between Fermi Level and valence band is less than 3kT or do you mean something else? I am looking forward to your reply. Thank you. 

Our Engineer's Reply:

Yes, though the concept of a degenerately doped semiconductor is not a precise one. A degenerately doped semiconductor is one that is so heavily doped that it starts acting like a metal. A degenerately doped semiconductor is one with Nc<1E18/cc which corresponds to p-type Ro<0.040 or n-type Ro<0.020. At El-Cat we consider degenerately doped Silicon to have Ro<0.020 Ohmcm

The following wafer item was purchased:

Si Wafer Item #785
100mm P/B <100> 0.001-0.005 ohm-cm 525um SSP Prime Grade