Question

conductivity of silicon increases on doping it with phosphorus explain?

Answer 1

Hello friend .
Conductivity of silicon increases on doping it with phosphorus due to presence of free delocaliesed electrons .

Answer 2

Explanation:

A conductor formed when a pentavalent impurity like phosphorous, arsenic, antimony, bismuth etc is added to it is known as N-type semiconductor.

As it is known that a semiconductor has four valence electrons and a phosphorous atom has five valence electrons.

So, when silicon is doped in a phosphorous then four electrons of phosphorous combines with silicon and one electron remains free.

As electricity is the flow of free electrons.

Therefore, it helps in increasing conductivity of N-type semiconductor.