Question

Why is current low in Reverse Bias?

Answer 1

Reduction in the Depletion Layer due to Forward Bias. This condition represents the low resistance path through the PN junction allowing very large currents to flow through the diode with only a small increase in bias voltage.

Answer 2

Reverse leakage current. ... This produces a current of minority charge carriers and hence its magnitude is extremely small. For constant temperatures, the reverse current is almost constant although the applied reverse voltage is increased up to a certain limit. Hence, it is also called reverse saturation current.