Which of the following devices is based on the principle of a p-n junction? (202

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Question: Which of the following devices is based on the principle of a p-n junction? (2023)

Options:

Correct Answer: LED

Exam Year: 2023

Solution:

A Light Emitting Diode (LED) is based on the principle of a p-n junction, emitting light when current flows through it.

Which of the following devices is based on the principle of a p-n junction? (2023)

Which of the following devices is based on the principle of a p-n junction? (2023)

Step 1: Understand what a p-n junction is. It is formed when p-type and n-type semiconductors are joined together.
Step 2: Know that a p-type semiconductor has 'holes' (positive charge carriers) and an n-type semiconductor has extra electrons (negative charge carriers).
Step 3: When a p-n junction is created, electrons from the n-type region move to fill the holes in the p-type region, creating a depletion zone.
Step 4: When current flows through a p-n junction, it can emit light if the device is designed for that purpose.
Step 5: Identify that a Light Emitting Diode (LED) is a device that uses a p-n junction to emit light when current passes through it.

No concepts available.