Types of extrinsic semiconductors

In last article I have started discussion on extrinsic semiconductor. In today’s article I will discuss the extrinsic semiconductor and its 2 types in detail. As already discussed a doped semi-conductor is known as an extrinsic semi-conductor. It is of 2 types:

a) n-type semiconductor and b) p-type semiconductor

Let us discuss these two types of extrinsic semiconductors in detail: Continue reading “Types of extrinsic semiconductors”

Semiconductor and its types


Semiconductors are the materials whose conductivity lies between insulator and conductors. Their conductivity lies in between insulator and conductors because of the energy band gap. The energy band gap of semiconductor lies in between insulator and conductors. For example for the case of silicon, the semiconductor, the conductivity is 1.1 electron volt.

Types of semiconductors: Continue reading “Semiconductor and its types”

why insulators do not conduct electricity

In the last article, I have discussed about the conductors, semiconductors and insulators. Today I will discuss why insulators do not conduct electricity or why insulator is insulator?

As I have already discussed that there is energy band gap between valence band and conduction band. This energy band gap is very large in case of insulators. It may be minimum of 3 electron volt or more. Continue reading “why insulators do not conduct electricity”

Energy Band in a case of Solids

Energy band or energy band gap in solids is defined as the energy gap between the top of the valence band and bottom of the conduction band. The unit of the energy band gap is normally electron-volt (ev). It is denoted by the symbol Eg.

According to Bohr’s atomic model, the electrons revolving around the nucleus are governed by a definite path and hence have a definite energy level so the electrons in an atom have well-defined energy levels. Continue reading “Energy Band in a case of Solids”

Solids and its types


Solid is one of the four forms of matter. Solid does not flow like liquids but all the solids possess the property of elasticity which means that when a deforming force is applied on a solid, it returns to its original position. Since the solids are made up of atoms or molecules, so depending upon their arrangement, they are classified into two categories.

(a)    Crystalline

(b)   Amorphous Continue reading “Solids and its types”