SOLUTION

For semiconductors, we have a negative temperature coefficient of resistance i.e. as temperature increases then conductivity increases and resistance decreases.

Properties of intrinsic semiconductors

1. They have four valence electrons
2. Their properties lie between conductors and insulators.
3. Their conduction property can be varied by varying the temperature.
4. They have a negative temperature coefficient of resistance.
5. Their properties can be varied by adding impurities to the semiconductor.
6. The resistivity of a semiconductor is greater than a conductor and less than an insulator.