What is reverse saturation current?

Answer: The migration of minority carriers from the neutral regions to the depletion zone results in a portion of the reverse current in a semiconductor diode known as the reverse saturation current.

And it is calculated by the following formula;

Here,

I_D = Diode current in amps

I_s = Saturation current in amps

e = Euler’s number

V_D = Volatage applied across diode in volts