AP EAMCET · Chemistry · p Block Elements (Group 13 & 14)
Which one of the following elements, when present as an impurity in silicon makes it a p-type semiconductor?
- A \(\mathrm{As}\)
- B \(\mathrm{P}\)
- C \(\mathrm{In}\)
- D \(\mathrm{Sb}\)
Answer & Solution
Correct Answer
(C) \(\mathrm{In}\)
Step-by-step Solution
Detailed explanation
When silicon is doped with such an impurity valency of which is less than \(4, p\)-type semiconductor is obtained. valency of As, P and Sb is +5 and of In is +3 . Thus, In is the impurity which when added to \(\mathrm{Si}\) gives \(p\)-type semiconductor.
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