First 125 words of the document:
P-N JUNCTION DIODE
A p-type material is joined to an n-type material:
Electrons drift from n-type to p-type to fill adjacent holes
This creates a depletion layer at the junction with no free charge carriers
The p side of the junction gets a small negative charge and the n side gets a small positive charge, creating a small
voltage barrier against the further drift of charge.
Negative terminal n-type
Positive terminal p-type
Forward bias allows the charge carriers to flow around the circuit THE DIODE CONDUCTS.
Negative terminal p-type
Positive terminal n-type
Reverse bias increases the potential barrier THE DIODE ACTS AS A BLOCK TO CURRENT.