Q111 / 200 · MHT CET - Medical 2026 (24 April Shift 1) · Chemistry
The silicon doped with gallium forms
- An-type semiconductor
- Bboth n and p-type semiconductor
- Can intrinsic semiconductor
- Correct answerDp-type semiconductor
Solution
Silicon is a Group 14 element with four valence electrons.
Gallium is a Group 13 element with three valence electrons.
When silicon is doped with gallium, the gallium atoms replace some of the silicon atoms in the crystal lattice.
Since gallium has only three valence electrons, it can form only three covalent bonds with the surrounding silicon atoms.
This creates a vacancy or a hole in the fourth bond, which acts as a positive charge carrier.
Therefore, doping silicon with gallium results in the formation of a p-type semiconductor.
Answer: p-type semiconductor
Gallium is a Group 13 element with three valence electrons.
When silicon is doped with gallium, the gallium atoms replace some of the silicon atoms in the crystal lattice.
Since gallium has only three valence electrons, it can form only three covalent bonds with the surrounding silicon atoms.
This creates a vacancy or a hole in the fourth bond, which acts as a positive charge carrier.
Therefore, doping silicon with gallium results in the formation of a p-type semiconductor.
Answer: p-type semiconductor
Hence, the correct answer is option: 'D'.