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Overlap of energy bands

  1. Jun 16, 2007 #1
    1. The problem statement, all variables and given/known data
    I'm using this site to understand my course on semiconductor physics better. In paragraph 2.3.4, the difference between insulators, semiconductors, metals is explained, based on the differences in bands. I understand the basic model.

    What I don't understand, is figure 2.3.7 b) :[​IMG]

    How should I visualize this? Which bands are overlapping? Are these two valence bands overlapping? (As is the case in most semiconductors) Or is this the overlapping of a valence band and a conduction band - hence, is there no bandgap then? Is this the behaviour of a metal?

    Many thanks already,

  2. jcsd
  3. Jun 16, 2007 #2


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    I think it is the valence band that overlaps the conducting band, of the entire solid of course. These "bands" are for the solid as a whole, not for individual atoms.
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