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Doping doubt

  1. Sep 10, 2009 #1
    Doping doubt....

    Why pentavalent elements are used in doping semiconductors why not an element with 6 valence electrons?
     
  2. jcsd
  3. Sep 11, 2009 #2
    Re: Doping doubt....

    Here's a list of <a href="http://en.wikipedia.org/wiki/List_of_semiconductor_materials#Group_II-VI">II-VI semiconductors</a> where elements with 6 valence electrons are used.

    Maybe someone who knows more about semiconductors specifically can answer your question, but my guess is that once you get to II-VI semiconductors the band gaps start to become large due to the stronger ionic character relative to III-V's. If the band gap is too large, you wind up with a good insulator or a bad semiconductor.
     
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