Target Exam

CUET

Subject

Physics

Chapter

Semiconductors and Electronic Devices

Question:

If a p-n junction is forward biased, then what is the direction of diffusion and drift current across the junction?

Options:

Diffusion - from n to p side, Drift - from p to n side

Diffusion - from p to n side, Drift - from n to p side

Diffusion - from n to p side, Drift - from n to p side

Diffusion - from p to n side, Drift - from p to n side

Correct Answer:

Diffusion - from p to n side, Drift - from n to p side

Explanation:

The correct answer is Option (2) → Diffusion - from p to n side, Drift - from n to p side

$\text{Forward bias: majority carriers dominate}$

$\text{Electrons diffuse: } n \rightarrow p$

$\text{Holes diffuse: } p \rightarrow n$

$\text{Conventional current due to diffusion (holes)}: p \rightarrow n$

$\text{Drift current (minority carriers)}: n \rightarrow p$

Diffusion - from p to n side, Drift - from n to p side.