Question

Phosphorus doped with silicon is a semiconductor. why

Answer 1

Reason -:
Phosphorus have five valence electrons in its outermost shell. When it is doped with an intrinsic silicon, four of the phosphorus electrons form covalent bonds with four neighbouring silicon atoms.
The fifth electron have no chance of forming a covalent bond so that it is loosely bounded and is far away from nucleus.

Answer 2

Here is ur answer :-

Phosphorus have five valence electrons in its outermost shell. When it is doped with an intrinsic silicon, four of the phosphorus electrons form covalent bonds with four neighbouring silicon atoms. ... So that electrons are the majority carriers in this type of semiconductors . Hence it is called N-type semiconductor.

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