Drift current Is of PN junction under open-circuit conditions

  • Thread starter anhnha
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  • #1
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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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Answers and Replies

  • #2
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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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