# Calculating on-state resistance

1. May 13, 2010

### kcmei

Hi guys,

I need some help with this question:

calculate the on state resistance of the following 4H-SiC Schottky diode device if the epitaxial layer is 10 micrometer and thickness of the substrate is 300 micrometer.

3. The attempt at a solution

i was thinking of using the equation for depletion width then the equation for R(on) as they are the only equations I know:

W=2Vb/Ec
R(on) = W/q.mu.N

but i am only given the layer thicknesses how can i work out the depletion width ? If i can get the depletion width then i think i can get R(on)

any help would be greatly appreciated.

Last edited: May 13, 2010