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Drift current Is of PN junction under open-circuit conditions

  1. Jun 13, 2013 #1
    Hi,
    I need help to understand this section from my book.
    attachment.php?attachmentid=59537&stc=1&d=1371176509.jpg
    attachment.php?attachmentid=59538&stc=1&d=1371176509.jpg

    Here we are considering drift current Is of PN junction under open-circuit conditions.
    I don't understand why the drift current Is is indepentent of the value of the depletion layer voltage Vo.
    I think the voltage create an electric field that helps minority charges in N, P materials establishing drift current Is. Therefore, it is of course dependent on Vo.
    Can you tell me where I am wrong here?
     

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  2. jcsd
  3. Jun 14, 2013 #2

    mfb

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    Staff: Mentor

    I think it is assumed that all generated minority carriers reach the junction. The generation process does not depend on the voltage.
     
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