A) phosphorus
B) indium
C) antimony
D) arsenic
Correct Answer: B
Solution :
If a trivalent impurity is mixed in a pure (intrinsic) semiconductor, then it becomes a p-type semiconductor. As given in , indium is trivalent impurity so it must be doped to Ge (or Sr) to make p-type semiconductor. \[\Rightarrow \] The added impurity is very small of the order of 1 atom per million atoms of the pure semiconductor when impurity atoms are in corporate in a pure semiconductor crystal, the electric properties are altered and most of the charge carriers originate from impurity atoms.
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