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

Asked by Mukul Mantosh | 22nd Nov, 2010, 12:00: AM

Expert Answer:

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.

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

where

IS is the reverse bias saturation current,
e is elementary charge
A is the cross-sectional area
Dp,n are the diffusion coefficients of holes and electrons, respectively,
ND,A are the donor and acceptor concentrations at the n side and p side, respectively,
ni is the intrinsic carrier concentration in the semiconductor material,
τp,n are the carrier lifetimes of holes and electrons, respectively.

 

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Answered by  | 23rd Nov, 2010, 01:08: PM

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