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Density of holes in valence band

  1. Mar 1, 2015 #1
    When electrons leave the valence band and jump over the gap to the conduction band, what is the density of the remaining holes?

    If 2.5 electrons/cm^3 leave the VB to the CB, will the density of remaining holes be 2.5 electrons/cm^3?

    To me it is logical, but I am wondering if mass of electron can change it. In crystal electron has mass mn*, and in CB, that mass is m0.
  2. jcsd
  3. Mar 2, 2015 #2


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    Staff: Mentor

    1 electron always leaves one hole. If you did not have holes before and 2.5 electrons/cm^3 migrate, then you'll have 2.5 holes/cm^3. The effective mass of electrons and holes does not matter for their number.
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