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Double Layer or Depletion Region?

  1. Oct 1, 2013 #1
    Hello everyone,

    Recently I have been studying double layers. As I have studied I have realized that there seem to be a lot of similarities between a double layer and a depletion region in a PN junction.

    The each form electric fields (and thus have a capacitance) and they each limit (or stop) the flow of charge carriers.

    So my question is: Are they the same thing? In what ways are they different?
  2. jcsd
  3. Oct 1, 2013 #2


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    Double layer of what?
  4. Oct 1, 2013 #3
    A semiconductor and water.
  5. Oct 1, 2013 #4


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    I would say no they aren't the same. For one, a depletion region still generates carrier through thermal and generation-combination processes (e.g. optical). These carriers are swept away but they wouldn't be created in water.

    Also, a depletion region is a rectifying region because its asymmetric. The water layer wouldn't rectify.
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