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A pn junction can be formed by bringing the p and n type materials together.
I cannot think of any, but a pn junction is a part of a diode and has a rectifying properties.
the material in which using for doping is already neutral.,,so the pn-junction diode also neutral........
The resistance of a forward biased pn junction is zero.
There are 2 type of biasing in PN junction didoe
Forward biasing
Reverse biasing