How does a p-n junction allow electric current to flow?

Question

Quizplus · Accepted Answer

A p-n junction allows electric current to flow in one direction only, from the p-type region to the n-type region, due to the difference in the concentration of majority carriers (holes in p-type and electrons in n-type) and the built-in electric field at the junction. This creates a potential barrier, which prevents the flow of majority carriers across the junction, but allows the flow of minority carriers (electrons in p-type and holes in n-type) through the depletion region. Thus, the p-n junction acts as a rectifier, allowing current flow in one direction and blocking it in the reverse direction.

How Does a P-N Junction Allow Electric Current to Flow