Semiconductor

What is the Semiconductor???????

Any of a class of crystalline solids intermediate in electrical conductivity between a conductor and an insulator.

There are two types of semiconductors

1. Intrinsic Semiconductor
2. Extrinsic Semiconductor

Intrinsic Semiconductor 

• An extremely pure semiconductor
• Its valence band is completely filled
• The conduction band is completely empty

Extrinsic Semiconductor

A semiconductor to which an impurity at a controlled rate is added to make its conductivity.

Do you know "Doping"

The process of adding impurity is called doping.

There are two types of extrinsic semiconductors

• N-type

Impurity atoms with 5 valence electrons produce n-type semiconductors by contributing extra electrons.

• P-type

Impurity atoms with 3 valence electrons produce p-type semiconductors by producing a "hole" or electron deficiency.