Finding series and shunt resistance of solar cell

[Swati Jain]

Hi,
I am trying to find out series and shunt resistance of solar cell from I-V curve which starts from Isc and going to Voc.

I read some papers and for single illumination mostly said R_s= -(dv/dI)_V=Voc
and R_sh= -(dv/dI)_I=Isc.
so I am finidng Rs from slope between points from V_max to V_oc, and R_sh from I_sc to V_max.
Am I doing something wrong? My series resistance is coming very high around 11k ohm.

 

[NascentOxygen]

I am finidng Rs from slope between points from V_max to V_oc

Aren't V_max and V_oc going to be the same point??

Seems to me if you need the slope around V_oc then you draw a tangent there.