Difference between Conduction band and Valance band

Difference between Conduction band and Valance band

Conduction band and valance band both are interesting topics in band theory of solids. It is nothing but the energy levels which are separated by some amount of energy. The band gap energy is defined as the minimum energy required to shift the electrons from valance band to conduction band. The conduction band have free electrons which are take part in the conduction process and they are free to move anywhere in the volume of the solid. At room temperature this band is either empty or partially filled.  The electrons in conduction band gain energy from the external electric field. The electrons in the valance band cannot take part in conduction process as their electrons are in valance band and they are not free to move. The valance band is never empty. The difference between them is as follows

               Conduction Band        Valance Band
1) The conduction band is lie above the fermi level.

2) The conduction band have free electrons which take place in the process of conduction.

3) The current flow in the conduction band is due to the free electrons which are free to move anywhere within the solid.

4) The conduction band is can be empty or partially filled.

5) The free electrons in conduction band absorb energy and jump to the valance band.

 

1) The valance band is lie below the fermi level.

2) The valance band don’t have free electrons so it cannot take part in the process of conduction.

3) There is no current flow due to electrons in valance band.

4) The valance band cannot be empty, it is partially or fully filled.

5) If electrons in valance band absorb the energy or if we give energy to them it will leave the valance band.

Updated: February 10, 2022 — 7:01 pm

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