Fermi Level of semiconductor

  1. Hi Guys, I read that the Fermi level of semiconductor, like germanium, is in-between the completely occupied upper band and conduction band, i.e. right in the gap. Why is that? shouldn't it have beed exactly the highest occupied level ?
     
  2. jcsd
  3. Simon Bridge

    Simon Bridge 14,660
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    Only for low temperatures, and only if there are no impurities.
    The band theory of solids is a bunch of rules so you don't have to deal with the fine details of the potential and the impact of the impurities.

    http://hyperphysics.phy-astr.gsu.edu/hbase/solids/fermi.html
     
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