In this biasing, forward current flows due to majority charge carriers. The width of depletion layer decreases.
( iv) Reverse Biasing In this biasing, the p-side is connected to negative terminal and n-side to positive terminal of a battery.
In this biasing, reverse current flows due to minority charge carriers. The width of depletion layer increases.
A p-n junction diode can be utilized as a rectifier. Zener diode, photo-diode, light-emitting diode, etc are specially designed p-n.
junction diodes. p-n Junction Diode
The current through p-n junction flow only from p toward n and not from n toward p.
The maximum voltage that a junction diode can bear without break is called zener voltage and the junction diodes possessing this voltage is known as zener diode.
Resistance of diode R = V / I