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Maximum Built-In Voltage of a PN junction

  1. Dec 4, 2015 #1
    Hi,

    I'm familiar with the expression for calculating the built-in voltage of a p-n junction. How can I find the maximum built-in voltage before the semiconductor becomes degenerate (i.e., a bad metal) if I only know the material and the intrinsic carrier concentration at a given temperature?

    Unfortunately it is not as simple as taking a derivative and setting it to zero, because the derivative of the built-in voltage expression goes as 1/x.

    Cheers
     
    Last edited: Dec 4, 2015
  2. jcsd
  3. Dec 4, 2015 #2
    Can you define the "built-in voltage of a semiconductor"?
     
  4. Dec 4, 2015 #3
  5. Dec 4, 2015 #4
    The formula (and the figure) refers to a junction and not to a semiconductor. This is what I found confusing.
    Thank you for clarification.
     
  6. Dec 4, 2015 #5
    I see! Indeed that was a mistake.
     
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