Question

When the temperature of a doped semiconductor is increased, its conductivity _________.

• A. decreases
• B. increases
• C. does not change
• D. increases or decreases depending on whether it is p-type or n-type

Answer 1

The correct option is B increases

When the temperature of a doped semiconductor is increased, the number of charge carriers increases since the thermal energy supplied to electrons in the valence band forces them to excite to the conduction band. As a result, the number of electrons in conduction band increases and holes in valence band increases so, conductivity increases.