Question

Give reasons:
phosphorus doped silicon is a semiconductor​

Answer 1

Answer:

Phosphorus being a pentavalant atom has one unpaired electron left after bonding with four other silicon atoms. Due to this unpaired electron the no. of electrons as charge carriers increases making the resultant semi conductor a n-type semiconductor. 

Explanation:

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Answer 2

Answer:

• Basically, silicon is in crystal structure.
• When it is doped with a group 15 element like Phosphorus or Arsenic ( P or As ) , which contains 5 electrons are used in the formation of four covalent bonds with the four neighbouring silicon atoms.
• The fifth electron is not used in bonding and becomes delocalised.
• This delocalised electron increases the conductivity of doped silicon.

Hence,

• Silicon doped with electron rich impurity is called ,n - type semiconductor.