In V-I characteristics of a p-n junction diode, why is the current under reverse bias almost independence of the applied potential upto a critical voltage?
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When a p-n junction is reverse biased, a very small current (of the order of few `muA`) flows due to drifting of minority charge carriers whose number density remain constant upto the critical voltage. As result of it, the current under a reverse bias is almost independent of the applied potential upto critical voltage.
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