Question

When will the conductivity of a Germanium semiconductor decrease?

• A. On adding donor impurity
• B. On adding acceptor impurity
• C. In making UV light incident
• D. On decreasing the temperature

Answer 1

Answer: (D)

On decreasing the temperature

In a semiconductor, the gap between the valence band and the conduction band is minimal. The electrons residing in the valence band can acquire energy and jump to the conduction band. When a semiconductor’s temperature decreases, it decreases the electrons’ energy, resulting in reduced conductivity of the intrinsic semiconductor.