Question

If indium is added in small quantity to germanium metal, we get a/an:

• A. n-type semiconductor
• B. p-type semiconductor
• C. rectifier
• D. insulator

Answer 1

The correct option is B p-type semiconductor

Acceptor impurity atoms like indium have fewer valence electrons than the atoms they replace in the intrinsic semiconductor lattice. They accept electrons from the semiconductor's valence band. This provides excess holes to the intrinsic semiconductor.

Excess holes increase the hole carrier concentration of the semiconductor creating a p-type semiconductor.

Hence, option B is correct.