The most important question of Semi Conductor Physics in Electronic Devices and Circuits; What is an insulator, a semiconductor and a metal?, is being answered here.
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| an insulator, a semiconductor and a metal |
INSULATOR:
An insulator is a material that offers a very low level of conductivity under Pressure from an applied voltage source. In this material Forbidden energy gap is large (EG 6e.V). So, electron can not acquire enough energy and hence conduction is not possible.
Ex: Diamond is a perfect insulator.
SEMI CONDUCTOR:
A semiconductor, is a material that has a conductivity level somewhere in between the extremes of an insulator and a conductor. Energy gap is only about 1ev.
Ex: Germanium, Silicon(Energy gap of Germanium is about 0.785 ev and for silicon it is 1.21ev).
CONDUCTOR:
Conductor is a material that will support a generous flow of charge when a voltage source of limited magnitude is applied across its terminals. There is no energy gap in conductors. Conduction band and valence band are overlapped.
Ex:Copper, Aluminium.
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