How is the junction barrier between n-type and p-type silicon much like a one-way valve?

Question

Quizplus · Accepted Answer

The junction barrier between n-type and p-type silicon acts like a one-way valve because it allows the free flow of electrons from the n-type side to the p-type side, but not the other way around. This is because of the orientation of the charges around the barrier, which allows only electrons (and not holes) to move across the barrier. This behavior is similar to a one-way valve, which allows fluid to flow in only one direction.

How Is the Junction Barrier Between N-Type and P-Type Silicon