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Why does the width of depletion region is small in highly doped diode?

  1. Jul 21, 2012 #1
    In Zener Diode, In highly Doped diode,the breakdown(Zener breakdown) occurs in small voltage.How?
    Thanks& Regards,
  2. jcsd
  3. Jul 22, 2012 #2


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    Science Advisor

    The higher is the doping level then the narrower is the depletion region for any given reverse bias voltage. A narrower depletion region means that voltage is "blocked" over a shorter distance, meaning that the peak electric field is higher.
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