Physics - Semiconductors Question with Solution | TestHub
In unbiased p-n junction diode
Options:
Answer:
Solution:
In an unbiased p-n junction, due to the concentration gradient, electrons diffuse from the n-region to the p-region and holes diffuse from the p-region to the n-region.
This diffusion process leaves behind positively charged immobile donor ions in the n-region and negatively charged immobile acceptor ions in the p-region near the junction.
These immobile ions form a depletion layer. The accumulation of positive charges on the n-side and negative charges on the p-side creates an internal electric field.
The direction of this electric field is from the positive charges to the negative charges, which is from the n-type side to the p-type side.
Answer: there is an electric field at the junction directed from the n-type side to p-type side.
