Question

If phosphorus is doped with silicone and silicon is doped with boron, identified the type of semiconductor

Answer 1

If silicon is doped by phosphorus, as P is pentavalent and has extra electron. It behaves as donor atom to the conduction band of Si, so it forms n type semiconductor.

If silicon is doped with Boron, as B is trivalent and is deficient of one electron. It behaves as acceptor atom from the valence band of Si, so it forms P type semiconductor.