Q112 / 200 · MHT CET - Medical 2026 (22 April Shift 1) · Chemistry
Which one of the following elements when doped with silicon makes it p-type semiconductor ?
- AAs
- BBi
- Correct answerCGa
- DSb
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
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
Hence, the correct answer is option: 'C'.