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Fermi level in semiconductors

  1. Nov 15, 2012 #1
    I Know that the fermi level in an intrinsic semiconductor is found between the valency level and the conduction level in the enegy gap , and I know that also when the semiconductor is doped the fermi level either move toward the conduction band or away from it.But actually I can not get the physical meaning of the fermi level, so I would be glad if someone helped and thank you>
     
  2. jcsd
  3. Nov 15, 2012 #2
    It's the energy at which the probability of occupation of a level changes from high to low.

    Which needs a level, of course. There is none in the forbidden band.
     
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