Question

The barrier potential of a $p-n$ junction depends on (1) type of semiconductor material (2) amount of doping (3) temperature Which one of the following is correct?

• A. (1) and (2) only
• B. (2) only
• C. (2) and (3) only
• D. (1), (2) and (3)

Answer 1

The Correct Option is D

The barrier potential of a $p-n$ junction is influenced by several factors. Let's analyze the factors listed in the question:

1. Type of semiconductor material: Different semiconductor materials have varying properties, such as band gap energy, that influence the barrier potential. For example, silicon and germanium have different band gaps, affecting their respective barrier potentials.
2. Amount of doping: Doping refers to the addition of impurity atoms to a semiconductor to change its electrical properties. Higher doping levels usually result in a higher concentration of charge carriers, which influences the width and height of the depletion region, thereby affecting the barrier potential.
3. Temperature: An increase in temperature provides more energy to the charge carriers, which can overcome the barrier potential more easily, thus impacting the effective value of the barrier potential.

Considering the above points, it is evident that all three factors—type of semiconductor material, amount of doping, and temperature—affect the barrier potential of a $p-n$ junction.

Therefore, the correct answer is: (1), (2) and (3).