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Doping silicon or germanium with a trivalent impurity produces which semiconductor?
AA q-type
BA t-type
CA v-type
DA p-type
Answer & Solution
Correct answer: D. A p-type
1. A trivalent atom has one fewer valence electron than silicon.
2. The missing electron leaves a hole behind.
3. This is obtained when Si or Ge is doped with a trivalent impurity.
4. That gives a p-type semiconductor.
_Source: NCERT Class XII Physics Part II, Ch 14 'Semiconductor Electronics'_
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