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PN Junction

Discussion in 'Electronic Basics' started by Beenu, Feb 26, 2006.

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  1. Beenu

    Beenu Guest

    Hi All,

    I have a question on the currents in the PN Junction diode. This has
    been bugging me for a lot of time.

    When the PN junction is forward biased, how does the holes from the
    P-type move into the N-type ?

    Since for the fomation of hole in the N-type, a valency electron should
    occupy the hole near the junction of P-type. But there are free
    electrons in P-type, which can occupy the holes near junction of
    P-type, considering the fact that their mobility is higher when
    compared with holes.
    Will the valence electrons in N-type has any chance to occupy the holes
    of P-type, overcoming the speed of free electrons ?

    Also when a hole is formed near the junction of N-type, dont you think
    there is a chance of free electron of n-type taking the placeof that
    hole.

    Please answer my question as soon as possible.

    Thanks,
    Beenu
     
  2. Noway2

    Noway2 Guest

    You should probably find a good book on Micro Electronic Circuits that
    explains this.

    Basically, when you forward bias the PN junction you narrow the
    depletion region. Once this happens, the application of voltage
    (pressure) can cause carries to pass through.
     
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