from the J-V curve or the I-V curve for the light condition of any solar cell applications.how to determine the Rs and Rsh at the point of Voc and Jsc or Isc from the curve only.
In I-V curve, Rs can be obtained by calculating 1/slope at the point of open circuit voltage. Similarly, 1/slope at short circuit current gives Rsh. Microsoft excel has facility to calculate these slopes using Slope command.
Rs can indeed be obtained by 1/slope at the open circuit voltage. However, there is not something like the Rs of a solar cell as it changes with current and thus with voltage. 1/slope is one way to express the Rs, but it can also be obtained by a fit of a one- or two-diode model that includes the Rs. This is less trivial but there ares some programs available to perform the fit. Again this does not include the voltage dependence of Rs. For this reason it should always be mentioned how Rs was derived as the different methods give different results.
One way to find the series resistance to to plot 1/current against the slope of the I-V curve . Fit a line to the region which is linear for small values of 1/J and the y-intercept approximates the series resistance. Here is a good reference for extracting I-V parameters: http://onlinelibrary.wiley.com/doi/10.1002/pip.518/pdf
Can anyone help me in finding Rs and Rsh/Rp at different temperatures from their reference values Rs_ref and Rph_ref at 298K or 25 degrees celsius?
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