Apologies first - I can't find a "more appropriate" sub-forum for this question

The diode curve can be modelled as

I = Io(e^(eV/nKT) - 1) where n is 1 "in theory"...e=electron charge, K=Boltzmann's constant. I belive this is called the Ebers-Moll equation.

The curve passes through (V,I) = (0,0).

Question: Is there a single equation covering reverse breakdown too?

Hello questioner:

That equation is valid for forward bias and for reverse bias and it is valid for the transition region between

forward and reverse bias. In other words the equation is a very accurate description of PN junction diode

behavior, with the important exception of when the diode is in reverse breakdown. Also, of course that

equation does not include the effect of any extrinsic external series resistance of the diode.

Remember that the voltage V in the equation is negative in reverse bias so the current I will be very small

and have a negative sign, i.e. flow in the reverse direction.

Here is a link that might be helpful as background:

http://www.ittc.ku.edu/~jstiles/312/handouts/Forward%20and%20Reverse%20Bias%20Approximations.pdf

Doug