If a p-n junction is forward biased, then what is the direction of diffusion and drift current across the junction?
Answer & explanation
Correct answer: option 2
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.