Electrical Engineering Materials MCQ Questions & Answers | Electrical Engineering

The conductivity of an extrinsic semiconductor (doped semiconductor) changes with temperature. It is influenced by the number of charge carriers (either electrons or holes) and their mobility within the material.

The behavior of conductivity with temperature depends on the type of extrinsic semiconductor:

In an n-type extrinsic semiconductor (where the majority charge carriers are electrons), as the temperature increases, more electrons are promoted from the valence band to the conduction band, resulting in increased electron concentration. This leads to an increase in conductivity with temperature.

In a p-type extrinsic semiconductor (where the majority charge carriers are holes), as the temperature increases, more holes are generated in the valence band, contributing to an increase in hole concentration. This also results in an increase in conductivity with temperature.

So, for both n-type and p-type extrinsic semiconductors, the conductivity increases with temperature.