How are charge carriers produced in intrinsic semiconductor

How are charge carriers produced in intrinsic semiconductor?

a) by electrons

b) by pure atoms

c) by impure atoms

d) by holes

Then the answer to this question is C, which is by impure atoms. Extrinsic semiconductors are a type of impure semiconductor that gets their name because the charge carriers in the material are produced by impurity atoms. Doping an intrinsic semiconductor with impurity atoms results in the production of these materials. So, it is proved that the answer to the question “how are charge carriers produced in intrinsic semiconductor” is by impure atoms.

Intrinsic carrier concentration

When an intrinsic semiconductor’s valence electrons break a covalent bond and move into the conduction band, two different kinds of charge carriers are produced. These charge carriers are called hole carriers. Free electrons and holes are what you’re looking at here. The term “intrinsic carrier concentration” refers to either the number of electrons or the number of holes that are present in a given volume of a material’s valence or conduction band, respectively. It is referred to as the electron-carrier concentration when the number of electrons present in the conduction band is measured per unit volume, and it is referred to as the hole-carrier concentration when the number of holes present in the valence band is measured per unit volume. In an intrinsic semiconducting material, the number of holes made in the valence band is the same as the number of electrons made in the conduction band. Because of this, there are the same number of electron carriers as there are hole carriers.

What is the charge carriers in a semiconductor?

Electrons and holes are the two types of charge carriers that can be found in a semiconductor. In the valence band of a semiconductor, the unoccupied electron states are referred to as “holes.” At absolute zero, every quantum state is filled by an electron in the valence band, which is why this band is referred to as a “completely filled” band. Therefore, the electrons that occupy this band are said to be “immobilized.” Some of the states in this band will become available for occupation once the temperature rises above zero or when impurities are brought into the system. This unoccupied state seems to move around as if it were a charge carrier with a positive charge. 

References

1. How is charge carriers produced in intrinsic semiconductors?a)By pure atomsb)By electronsc)By impure atomsd)By holesCorrect answer is option ‘C’. Can you explain this answer? | EduRev Mechanical Engineering Question
2. What is the charge carriers in a semiconductor? – Quora
3. Intrinsic Carrier Concentration | PVEducation