Question

Conductivity of silicon increases on doping it with phosphorus

Answer 1

Conductivity increases due to extra free delocalised electrons

Answer 2

Due to the presence of one non-bonded electron, the conductivity of silicon increases on doping it with phosphorus.

Explanation:

• The process of introduction of impurities in the semi-conductors to improve their conductivity is called doping.
• When silicon is doped with phosphorus the dopant atom forms four covalent bonds like silicon.
• The fifth electron which is not involved in bonding gets de-localized as a result of which the electrical conductivity of the doped silicon increases.
• Thus it is inferred that the presence of non-bonded electrons increases the conductivity of silicon on doping with phosphorus.

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