# Double Layer or Depletion Region?

hobbs125
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?