Question

The reason of current flow in p-n junction in forward bias is:

• A. Drifting of charge carriers
• B. Drifting of minority charge carriers
• C. Diffussion of charge carriers
• D. All of the above

Answer 1

The correct option is C Diffussion of charge carriers

During formation of p-n junction p-side has excess holes and n-side has excess electrons. Hence, current tends to flow due to diffusion from p-side to n-side. This does not happen without an external bias because of the potential barrier at the junction.

When p-side is given a potential higher than the n-side, it aids in the flow of this diffusion current and hence, current flows.