Question
Sat December 22, 2012 By:

what is the use of depletion layer ? and what are its effects on the majority and minority carriers in a pn junction?

Expert Reply
Mon December 24, 2012
Depletion layer resists the further flow of majority carriers through the junction after a certain period of time.
If the depletion layer would not have been there then all the majority carriers would have flown through the junction and have fused with the holes/electrons at the other end of the junction and the efficiency of the diode would have been decreased to a large extent.
If the width of depletion region increases then that means the resistance of the diode increases and the flow of majority carriers decreases, decreasing the current.
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