Band theory

  • Thread starter suku
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  • #1
suku
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are semiconductors charged? i mean '"n" type contains excess of electrons, so they should be charged...
please tell me where i am wrong
tks for any answer...
 

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  • #2
Born2bwire
Science Advisor
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Doped semiconductors are not charged. We dope the material with neutral atoms, not ions. The excess carriers are due to unbonded electrons or desired bonds with the atoms.
 
  • #3
xlines
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are semiconductors charged? i mean '"n" type contains excess of electrons, so they should be charged...
please tell me where i am wrong
tks for any answer...

Nope, they are not charged. Excess electrons are there because dopants, like phosphorus, gives extra electron to conducting band (per atom), but don't forget that same phosphorus atom has extra positive charge in nucleus so it evens out.
 

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