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Voltage Drop Across a diode

  1. May 4, 2016 #1
    1. The problem statement, all variables and given/known data
    I have recently performed an experiment where the voltage drop and current through a diode were measured. I am wondering why the voltage drop across the diode changes. Theoretically, the voltage drop should stay the same as there is a certain amount of energy required to get past the depletion zone at the junction of the P-doped and N-doped silicon. Why then does the voltage drop change as the current increases?

    2. Relevant equations
    There are no relevant equations for this question.

    3. The attempt at a solution
    Does the voltage possibly increase due to the increase charge in the diode as the current increases? I am really not sure as everywhere I have read states that the voltage drop shouldn't change.
  2. jcsd
  3. May 4, 2016 #2


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    Hi Alex, :welcome:

    Check regions 3 and 4 here and the Shockley eqn right after that.
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