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Net current in a semiconductor

  1. Jul 25, 2011 #1
    We know that the built in potential barrier Vb does not allow any net current in a semiconductor. Now when we connect a battery in forward biased with the voltage V the current begins to flow even if V<Vb. Agreed. But my text says that V cannot exceed Vb is this true? for reference
    http://books.google.co.in/books?id=...&resnum=6&ved=0CD0Q6AEwBQ#v=onepage&q&f=false
     
  2. jcsd
  3. Jul 25, 2011 #2

    Drakkith

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    Re: Please Help! Semiconductor.

    I don't know much about this subject, but if that's what your textbook says then I'd say it is probably true.
     
  4. Jul 26, 2011 #3
    Re: Please Help! Semiconductor.

    The text didn't provide a reason. But i was thinking that if V>Vb there will be no barrier hence the current will be too large and that might damage the device. Can this be the reason?
     
    Last edited by a moderator: Jul 28, 2011
  5. Jul 26, 2011 #4

    Drakkith

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    Re: Please Help! Semiconductor.

    No idea. Anyone else know?
     
  6. Jul 26, 2011 #5
    Re: Please Help! Semiconductor.

    sounds like its talking about diodes and pn junctions.

    you do understand that there is forward and reverse bias?
     
  7. Jul 28, 2011 #6
    Re: Please Help! Semiconductor.

    yeah.yeah. so what do you propose?
     
    Last edited by a moderator: Jul 28, 2011
  8. Jul 28, 2011 #7

    berkeman

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    Re: Please Help! Semiconductor.

    Are you familiar with the Diode Equation? What is the relationship between current and voltage for a pn junction diode?

    If you're not familiar with the equation yet, check wikipedia.com
     
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