The reverse saturation current in a PN Junction diode is only due to:

Explanation

The reverse saturation current in a PN junction diode is largely due to the movement of minority carriers. In a reverse-biased PN junction, the electric field in the depletion region allows minority carriers (electrons in the P-region and holes in the N-region) to cross the junction, leading to a small but steady reverse current known as the reverse saturation current. Majority carriers contribute to the forward current when the diode is forward-biased. Acceptor and donor ions are involved in establishing the potential barrier and the depletion region but do not contribute directly to the reverse saturation current.