Insulators are such materials in which the conduction cannot take place, due to the large forbidden gap. Examples: Wood, Rubber. The structure of energy bands in Insulators is as shown in the following figure.
Characteristics
The following are the characteristics of Insulators.
· The Forbidden energy gap is very large.
· Valance band electrons are bound tightly to atoms.
· The value of forbidden energy gap for an insulator will be of 10eV.
· For some insulators, as the temperature increases, they might show some conduction.
· The resistivity of an insulator will be in the order of 107 ohm-meter.
