Physics - Semiconductors Question with Solution | TestHub

Phosphorus is a pentavalent impurity (Group 15 element).

When a pure semiconductor is heavily doped with a pentavalent impurity, it becomes an n-type semiconductor.

In an n-type semiconductor, electrons are the majority charge carriers and holes are the minority charge carriers.

Therefore, the number of electrons is much greater than the number of holes, which gives $n_e\gg n_h$.

Answer: ${\mathrm{n}}_{\mathrm{e}}\gg {\mathrm{n}}_{\mathrm{h}}$