Voltage Drop Across a diode

  • #1

Homework Statement


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?

Homework Equations


There are no relevant equations for this question.

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.
 

Answers and Replies

  • #2
BvU
Science Advisor
Homework Helper
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Hi Alex, :welcome:

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

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