Question

Reason for doping of impurities in semiconductors is to

• A. Increase the hardness of semiconductor
• B. Increase the conductivity of semiconductor
• C. to increase magnetic properties
• D. none of these

Answer 1

The correct option is B

Increase the conductivity of semiconductor

By doping impurities into semiconductors, depending on the valence ${\text{e}}^{-}$ of impurities, either holes or free electrons are formed. These electrons and holes act as carriers for electricity. So conductivity of semiconductor increases.