A p-n junction diode is two-terminal or two-electrode semiconductor device, which allows the electric current in only one direction while blocks the electric current in opposite or reverse direction. ... The p-n junction, which is formed when the p-type and n-type semiconductors are joined, is called as p-n junction diode.

What is P and N in pn junction diode?

The "p" (positive) side contains an excess of holes, while the "n" (negative) side contains an excess of electrons in the outer shells of the electrically neutral atoms there. This allows electrical current to pass through the junction only in one direction.

How does a pn junction diode work?

PN junction is formed in a single crystal by joining two N-type and P-type semiconductors. ... When the junction diode is biased in the reverse direction, the majority charge carriers are attracted by the respective terminals away from the PN junction, thus avoiding the diffusion of electrons and holes at the junction.