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

Options

A. As
B. P
C. In
D. Sb

Answer

c

Explanation

p-type semiconductor can be formed by doping silicon with elements whose valency is less than 4.
The valency of As, P and Sb is +5 and In is +3. Therefore, p-type semiconductor is formed by doping silicon with In.