Why does a p-n junction of two doped semiconductors conduct electricity in only

Question

Why does a p-n junction of two doped semiconductors conduct electricity in only one direction?

The voltage is adjusted to prevent electron travel in one direction.

Electrons entering the n-type side have no available states in the p-type material.

Electrons entering the p-type side have no available states in the n-type material.

The n-type material repels electrons.

The voltage is adjusted to prevent electron travel in one direction.

Electrons entering the n-type side have no available states in the p-type material.

Electrons entering the p-type side have no available states in the n-type material.

The n-type material repels electrons.

Explanation / Answer

Well, an electron moving from the n-type to the p-type material can occur spontaneously because the free electron's energy is released as radiation and it can move to a lower energy state, attached to an atom in the p-type semiconductor. But to move from the p-type to the n-type it has to gain energy from somewhere, and this isn't spontaneous because there is no guarantee of some other process providing this energy.

so the answer will be ,

c.

Electrons entering the p-type side have no available states in the n-type material.

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