Doping in semiconductor

  1. When we dope pentavalent in semiconductor,it will introduce a allowable energy level below the conduction band
    when dope a trivalent atom ,it will introduce a allowable energy level above valence band.

    But why, why will have a energy level in between (below and above) ??
    i cant figure it out, someone help me pls
     
  2. jcsd
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