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Energy gap doping dependence

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  1. Oct 22, 2014 #1
    Could anyone please explain why doped semiconductors show decrease of the bang gap in comparison to the pure semiconductors.

    Web/literature links to relevant information will be appreciated.

    Thanks.
     
  2. jcsd
  3. Oct 24, 2014 #2

    ehild

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    It happens at high doping, when the impurity atoms are so close that they interact and the doping energy levels split forming a doping band. That band can merge with the valence band/conduction band making the band gap narrower. See for example http://ecee.colorado.edu/~bart/book/eband6.htm or browse impurity band, gap narrowing .
     
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