Question

3. Explain the intrinsic semiconductor and extrinsic semiconductor

Answer 1

Answer:

The semiconductor is divided into two types. One is Intrinsic Semiconductor and other is an Extrinsic semiconductor. The pure form of the semiconductor is known as the intrinsic semiconductor and the semiconductor in which intentionally impurities is added for making it conductive is known as the extrinsic semiconductor.The conductivity of the intrinsic semiconductor become zero at room temperature while the extrinsic semiconductor is very little conductive at room temperature.

Answer 2

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Intrinsic semiconductor :

➻ It is a pure form of semiconductor

➻ When an atom is brought together to form molecules of matter each attempt to acquire eight electrons. But in semiconductor only 4 valence electrons are present in orbital atom ,hence 4 valence electrons atom form pairs of covalent bonds of neighbouring atoms.

➻ At very low temperature it acts as insulator because all the electrons are rigidly held in bond.

➻ At room temperature few covalent bonds get broken due to thermal agitation,free electrons generated

➻ In intrinsic semiconductor, the numbers of holes are equal to number of electrons

➻ Current flowing through semiconductor is due to both type of charges namely electrons and holes.

Extrinsic semiconductor:

➻ A doped semiconductor is called as extrinsic semiconductor.

➻ We can increase the conductivity of semiconductor by increasing doping concentration

➻ ➻ There are two types of extrinsic semiconductor

➻ N-type semiconductor

➻ P-type semiconductor

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