Conductor
The materials is called conductor which has a resistance of (10)^-6ohm-cm It is a small valve of resistance
Copper, Gold, Silver and Iron are the some examples of conductor
Semi-Conductor
The materials is called semi-conductor which has a resistance of (10)^2 ohm-cm It is a medium valve of resistance.
Germanium, silicon and carbon are the some examples of semi-conductor
Insulator
The materials is called Insulator which has a resistance of (10)^6 ohm-cm It is a high valve of resistance
Paper, Glass, Rubber, Wood and Oil are the some examples of insulators
Shell or Orbit
It is the path in which the electrons are moved or circulate around the nucleus of the atom
Valance Shell
Last shell of an atom in which electrons are moved is known as valance shell.
Valance Electrons
The no. of electrons which are present in valance shell of the atom is known as valance electron
Energy bands
It is the group of the energy levels who are very closer but separate to each other.
Types of energy bands
There are three types of energy bands
1). Filled Band
2).Valance band
3).Conduction band
Explanation of these bands is following there
Filled Band
A band in which minimum no. of free electrons are present is called filled band. This band is situated above on the valance band. In this band the electrons have low energy.
Valance Band
A band in which a large no. of free electrons is present is called valance band. This band is situated above on the conduction band. In this band the electrons have high energy.
Conduction Band
A band in which a large no. of free electrons is present is called valance band. This band is full fill with free electrons. This band situated below the valance band. In this band the electrons have very high energy.
Diagram
There are two main types of semi-conductor materials
1). Intrinsic semiconductor
2). Extrinsic semiconductor
contact.
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