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Homework Help: Heavy hole's and light holes

  1. Mar 26, 2008 #1
    1. The problem statement, all variables and given/known data
    A hole is just a valence band with one missing electron. A semiconductor is just a material that has its conduction electron concentration within a certain range. A direct-gap semiconductor is just a semiconductor with the conduction band edge and the valence band edge on the same vertical in the k-E graph.

    But then my book talks about heavy holes and light holes and split off holes and I just don't understand what they are.

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Mar 26, 2008 #2


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    Does this help?

    http://touch.caltech.edu/courses/EE40%20Web%20Files/Supplements/01_Effective_Mass.pdf [Broken]​
    Last edited by a moderator: May 3, 2017
  4. Mar 26, 2008 #3
    Sorry, not really. I just don't understand what they are. I don't understand how you can have three different valence bands when I thought by definition there was only one?
    Last edited by a moderator: May 3, 2017
  5. Mar 26, 2008 #4

    SOMEONE PLEASE HELP!! I NEED TO UNDERSTAND THIS!! What is a heavy hole and what is a light hole?
    Last edited: Mar 26, 2008
  6. Mar 26, 2008 #5
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