what is saturation current and for which purpose it is taken.........???

Dear student

Saturation current is a term used in relation to semiconductor diodes. It is more fully named reverse saturation current and is "part of the reverse current in a diode caused by diffusion of minority carriers from the neutral regions to the depletion region.

I_S, the reverse bias saturation current for an ideal p-n diode is given by,

where

I_S is the reverse bias saturation current,

e is elementary charge

A is the cross-sectional area

D_p,n are the diffusion coefficients of holes and electrons, respectively,

N_D,A are the donor and acceptor concentrations at the n side and p side, respectively,

n_i is the intrinsic carrier concentration in the semiconductor material,

τ_p,n are the carrier lifetimes of holes and electrons, respectively.

 

We hope this calrifies your doubt.

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