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Does any current flow in reverse PN junction?

  1. Oct 11, 2015 #1
    1. The problem statement, all variables and given/known data


    2. Relevant equations
    When a diode is reverse biased positive donor ions are left in the N semiconductor and negative acceptor ions in the P type. And since the N is conected to + and its donnor ions has a large +charge, why no electrons from P cannot cross the junction and move to the +of the battery?

    3. The attempt at a solution
     
  2. jcsd
  3. Oct 11, 2015 #2

    CWatters

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  4. Oct 11, 2015 #3
  5. Oct 11, 2015 #4

    CWatters

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    There is some reverse current but it's very small because it's the minority carriers involved. For example in the P-type material the majority charge carriers are holes. It's better to think of electrons that are injected from the -ve as reducing the number of holes available making it less conductive, rather than being free electrons able to go across the barrier.

    https://en.wikipedia.org/wiki/Reverse_leakage_current
     
  6. Oct 11, 2015 #5
    I get it now, thank you for ur answers:-)
     
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