Physics - Semiconductors Question with Solution | TestHub

In an unbiased p-n junction, due to the concentration gradient, electrons diffuse from the n-side to the p-side and holes diffuse from the p-side to the n-side.

This diffusion leaves behind uncompensated positive donor ions on the n-side and negative acceptor ions on the p-side near the junction.

As a result, a depletion region is formed with a built-in electric field directed from the positive ions on the n-side to the negative ions on the p-side.

This electric field creates a potential barrier where the n-side is at a higher (positive) potential relative to the p-side.

Answer: An electric field is established at the junction such that n side is at positive voltage relative to p -side.