Distinguish with the help of diagrams metal conductors, insulators and semiconductors from each other.
|Metals are good conductors of electricity.
|Insulators are nonconductors of electricity.
|Semiconductors have conductivity that is intermediate between conductors and insulators.
|In metal conductors, the conduction band is partially filled and there is no band gap or there is overlapping between the valence band and conduction band.
|In insulators, the valence band and conduction band in insulators are separated by a large energy gap called the forbidden zone.
|In semiconductors, the valence band is completely filled with electrons, and the conduction band is empty. However, the energy gap between the two bands is smaller than that in an insulator.
Concept: Electrical Properties of Solids
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