First slide

P-N junction diode

Question

When a p-n junction diode is reverse biased, then

Moderate

A

no current flows
B

the depletion region is reduced
C

the height of the potential barrier is reduced
D

the depletion region is increased

Solution

In reverse biasing, the applied voltage V on the r_side is positive and is negative on the p-side. The applied bias V and the barrier potential $V_{B}$ are in the same direction making the effective function potential V - $V_{B}$ . As a result, the junction width will increase. The higher junction potential would restrict the flow of majority carriers to a much greater extent. However,
such a field will favour the flow of minority carriers. So, reverse bias current will be due to the minority carriers only.

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