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In which of the following doped semiconductors majority of charge carriers are holes?

1. Antimony doped with germanium
2. Boron doped with silicon
3. Arsenic doped with silicon
4. Phosphorus doped with germanium

Correct answer: Boron doped with silicon

Solution

Boron has 3 valence electrons, while silicon has 4. When boron is doped into silicon, it acts as an acceptor and produces a p-type semiconductor, so holes become the majority carriers.

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