Question

Select the heavily doped from the given options.

• A. Zener Diode
• B. Light Emitting Diode
• C. Photodiode
• D. Both A and B

Answer 1

The correct option is D

Both A and B

Step 1: Explanation of the correct option

In the case of option D (zener diode and light-emitting diode)

1. In semiconductor manufacturing, doping is the intentional introduction of impurities into an intrinsic semiconductor to modify its electrical, structural, and optical properties.
2. The material that has been doped is called an extrinsic semiconductor.
3. A Zener diode is a silicon semiconductor device that conducts electric current in both directions.
4. Light-emitting diodes, which are widely observed in electronic equipment, use injection luminescence. It is done to join two semiconductor crystals with opposing doping.

Step 2: Explanation for the incorrect option

In the case of option C,

1. A photodiode is a PN-junction diode that converts light energy into electricity.
2. They are also known as photodetectors, photosensors, and light detectors.
3. Photodiodes are built to operate in a condition of reverse bias.
4. Silicon, germanium, and arsenide are common photodiode materials.

Hence, option D is the correct answer.