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breakdown voltage calculation.....

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ssankurathri

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breakdown voltage calculation

hi
i used guassian profile doping for my design. i would like to calculate the breakdown voltage for that junction.i found a formula for breakdown voltage calculation of linear graded junction as 9.17* 10^9 (a)^-0.4

in the above formula, 'a' is given as impurity gradient and units are cm^-4.
though i know the peak concentration and junction concentration for my doping,i couldn't calculate this impurity gradient, which indeed necessary for breakdown voltage calculation.
could anyone please help in this issue. i got struck up at this point. it's urgent.

Thanks
skr
 

junction breakdown calculation

If its linear, and you have two points, namely, thinner doping and thicker doping values, make a line and find its slope. X-axis is the distance. Y-axis is the doping profile.

I am not too sure about my answer, but the reason I think its not a bad method is because the gradient is in cm^-4, which is (cm^-3)/cm. Kinda reverse answering..

If anyone knows a better method, share it.....

Srivats
 

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