Question
Which of the following dopant is NOT used in Ge to obtain n-type semiconductor?
MHT CET
Chemistry
Solid State
2026
MHT CET 2026 (13 April Shift 1)
MHT CET Chemistry Question (2026) — Solution
Options
- A. P
- B. As
- C. Sb
- D. B
Answer
D. B
Step-by-step solution
Ge is a Group 14 element. To obtain an n-type semiconductor, Ge must be doped with a pentavalent impurity (Group 15 element) such as P, As, or Sb. Boron (B) is a trivalent impurity (Group 13 element). Doping Ge with B results in a p-type semiconductor. Therefore, B is not used to obtain an n-type semiconductor. Answer: B
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