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Why is phosphorus doped sizlicon is semiconductor ?

Answer»

When silicon is doped with small amount of phosphorus, its electrical conductivity increases. When silicon is doped with phosphorus, some of the positions in the lattice are substituted by phosphorus atoms. Phosphorus has five valence electrons. After forming four covalent bonds with silicon, one excess electron is left on phosphorus. This electron is not in volved in bonding and is delocolised. This contributes to electrical conductivity.



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