Pn Junction Diode Saturation Current

I 0 dark saturation current the diode leakage current density in the absence of light. Saturation current the saturation current or scale current more accurately the reverse saturation current is that part of the reverse current in a semiconductor diode caused by diffusion of minority carriers from the neutral regions to the depletion region.

Why A P N Junction Diode Conducts Only In Forward Bias Mode

Forward Bias Examples

Difference Between Reverse Saturation And Leakage Current

Under forward bias the diode current is due to recombination.

Pn junction diode saturation current. Diode current equation expresses the relationship between the current flowing through the diode as a function of the voltage applied across it. This recombination can occur within the quasi neutral regions within the depletion region or at the metal semiconductor ohmic contacts. Is the thermal voltage.

In a pn junction diode the reverse current is due to the diusive ow of minority electrons from the p side to the n side and the minority holes from the n side to the p side. The scale current is proportional to the cross sectional area of the diode. The current in a p n diode is due to carrier recombination or generation somewhere within the p n diode structure.

Q absolute value of electron charge. Continuing with the symbols. I the net current flowing through the diode.

Mathematically it is given as where i is the current flowing through the diode i0 is the dark saturation current q is the charge on the electron v. Hence is reverse saturation current depends on the diusion coecient of electrons and holes. The ideal diode law expressed as.

You say that the pn junction only starts to conduct current after the voltage aplied on the diode vd reaches 07v the barrier potential as you call it but all the graphics and equations shows us that there is current through the diode for values of vd smaller than 07v. V applied voltage across the terminals of the diode. This is defined as the reverse saturation current.

I think i missed something. Reverse saturation current when the p n junction diode is in reverse bias few amounts of current tends to flow through the diode this is because of the influence of minority charge carriers in it. The diode equation gives an expression for the current through a diode as a function of voltage.

Where is the saturation current or scale current of the diode the magnitude of the current that flows for negative in excess of a few typically 10 12 a. This current is almost independent of the reverse voltage.

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