Chemistry - Solid State Question with Solution | TestHub

Silicon is a Group 14 element with four valence electrons.

To form a p-type semiconductor, silicon must be doped with a trivalent impurity (Group 13 element), which creates a hole (deficiency of an electron) in the crystal lattice.

Among the given options, As, Bi, and Sb are Group 15 elements (pentavalent impurities) and will form n-type semiconductors when doped with silicon.

Ga (Gallium) is a Group 13 element. Therefore, doping silicon with Ga makes it a p-type semiconductor.

Answer: Ga