Reverse leakage current

Reverse leakage current in a semiconductor device is the current from that semiconductor device when the device is reverse biased.

When a semiconductor device is reverse biased it should not conduct any current at all, however, due to increased barrier potential, the free electrons on p side are dragged towards positive terminal of the battery, while holes on n side are dragged towards negative terminal of the battery. This produces a current of minority charge carriers and hence its magnitude is very very small. For constant temperature reverse current is almost constant though applied reverse voltage is increased up to certain limit. Hence it is also called as reverse saturation current.