N-Type silicon

  1. Why when phosphorus is added to silicon, phosphorus bind with only four silicon atoms and contributes with its extra electron, why doesn't just phosphorus bind with 5 silicon atoms since that is what it needs ???
     
  2. jcsd
  3. mfb

    Staff: Mentor

    Look at the lattice structure of silicon: where would the 5th silicon atom be? Is there space for a 5th and how would that atom bond to other atoms?
     

  4. That was I thought but I wasn't sure, thanks by the way :smile:
     
  5. One more question, Are the covalent bonds among the silicon atoms in a lattice considered as intermolecular bonds ?
     
  6. mfb

    Staff: Mentor

    There are no molecules in the lattice, I don't see why you would call bonds there "intermolecular bonds".
     
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