Drift current Is of PN junction under open-circuit conditions

AI Thread Summary
The discussion centers on the drift current Is in a PN junction under open-circuit conditions. The user questions why Is is independent of the depletion layer voltage Vo, believing that the electric field created by Vo influences the drift of minority carriers. The response clarifies that while Vo creates an electric field, the generation of minority carriers is not dependent on this voltage. It is emphasized that all generated minority carriers are assumed to reach the junction regardless of Vo. The key takeaway is that the drift current Is is determined by the concentration of minority carriers rather than the voltage across the depletion layer.
anhnha
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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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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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