In a PN junction, what is formed at the junction of p-type and n-type materials?

₹0.0

Question: In a PN junction, what is formed at the junction of p-type and n-type materials? (2021)

Options:

Correct Answer: Electric field

Exam Year: 2021

Solution:

An electric field is formed at the junction of p-type and n-type materials due to the diffusion of charge carriers.

In a PN junction, what is formed at the junction of p-type and n-type materials? (2021)

In a PN junction, what is formed at the junction of p-type and n-type materials? (2021)

Step 1: Understand what a PN junction is. It is formed by joining p-type and n-type semiconductor materials.
Step 2: Recognize that p-type material has an abundance of holes (positive charge carriers) and n-type material has an abundance of electrons (negative charge carriers).
Step 3: When the p-type and n-type materials are joined, electrons from the n-type region start to move into the p-type region.
Step 4: Similarly, holes from the p-type region start to move into the n-type region.
Step 5: As electrons move into the p-type region, they recombine with holes, creating a region near the junction that is depleted of charge carriers. This is called the depletion region.
Step 6: The movement of charge carriers creates an electric field at the junction, which opposes further movement of electrons and holes.

PN Junction Formation – At the junction of p-type and n-type materials, an electric field is created due to the movement and recombination of charge carriers (holes and electrons).
Charge Carrier Diffusion – The diffusion of holes from the p-type region and electrons from the n-type region leads to the formation of a depletion region and an electric field.