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How is this equation derived?

  1. Sep 29, 2013 #1
    Equation in pink: [​IMG]

    I was absent so I was going through the slides and I saw that equation. There isn't a derivation shown. Do you guys have any ideas?
     
    Last edited: Sep 29, 2013
  2. jcsd
  3. Sep 29, 2013 #2
    This is for solid state physics.

    n0 represents the number of electrons in a semiconductor. p0 represents the number of holes in a semi conductor.

    NA represents the number of positive (acceptor) ions. ND represents the number of negative (donor) ions.

    ni=pi=n0=p0 in an instrinsic semiconductor.
     
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