Why is a semiconductor virtually an insulator at room temperature?

Asked by Topperlearning User | 17th Jun, 2014, 03:32: PM

Expert Answer:

Semiconductors are virtually insulators at room temperatures because almost all the valence electrons are engaged in the formation of covalent bonds and there are practically very few free electrons. At low temperature the valence band of a semiconductor is completely filled and the conduction band is completely empty.Therefore a semiconductor virtually behaves as an insulator at low temperature.

 

Answered by  | 17th Jun, 2014, 05:32: PM