P-type Silicon
N-type Silicon
PN
Junction
Now, there IS a net charge....
the P-type side of the PN Junction
has picked up some free electrons..
and now has a net Negative charge
-V
+V
Depletion Region
The movement of electrons from the
N-type side will leave behind a
Depletion Region that behaves as
if it were intrinsic (undoped)
(Actually, most of the depletion region
will be on the lighter doped side)
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