Q25 / 160 · AP EAMCET 2012 · Chemistry

Which one of the following elements, when present as an impurity in silicon makes it a p-type semiconductor?

  • A
    $\mathrm{As}$
  • B
    $\mathrm{P}$
  • Correct answer
    C
    $\mathrm{In}$
  • D
    $\mathrm{Sb}$

Solution

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.

Hence, the correct answer is option: 'C'.

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