Which one of the following elements when doped with silicon makes it p-type semiconductor ?

Step-by-step solution

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