Hi
I have tried fitting the Shockley equation to my I-V data to determine Iph, Rs, Rsh, n. I use OriginPro software, and fitting doesn't converge.
I have defined the custom function in the software as it is in the attached pictures. I have put the initial values for Rs and Rsh from the slope method at Voc and Jsc respectively. The number of iterations is set to 700.
I use this method as it is proposed here: "M. Diantoro, T. Suprayogi, A. Hidayat, A. Taufiq, A. Fuad, and R. Suryana, “Shockley’s equation fit analyses for solar cell parameters from I-V curves,” Int. J. Photoenergy, vol. 2018, 2018".
Any help would be highly appreciated
Regards,
Mohammad
Dear Mohammad,
Would you please display the dark and illuminated I-V curves or the illuminated I-V curve at least. I would like to see if one junction model is sufficient to fit the I-V curve.
I would like that you use see the methods given in the book chapter: Chapter Solar cells and arrays: Principles, analysis and design
Best wishes
Dear Mohammad,
Would you please display the dark and illuminated I-V curves or the illuminated I-V curve at least. I would like to see if one junction model is sufficient to fit the I-V curve.
I would like that you use see the methods given in the book chapter: Chapter Solar cells and arrays: Principles, analysis and design
Best wishes
Prof. Abdelhalim Zekry thanks for your attention. I forgot to mention that the solar cells are organic solar cells with the structure of ITO/PEDOT:PSS/P3HT:PCBM/Al.
An example of J-V under dark and AM1.5 conditions is attached.
I'm facing a problem now and Jsc, PCE and FF are not as high as the standard ones.
Regards
Dear Mohammad
Firstly you may need to check the model carefully with what condition they used. You may need to modify their model or formulae considering your processing and device structure.
Secondly Origingpro software is easy to fit a simple formula. It takes time to a complicated one. I did it before. Ideally another software may be better such as MATLAB. It can be much faster to fit a complicated formula. And it is easy to use too.
Organic solar cells even have the same device structure since many layers involved, they could end up very different IV curves. The liquid or solution processed OPVs have even more complicated IV due to the defects of processing. With all sorts of conditions, I would suggest to have many IV curves to try on. And analyse the results using given formulae.
Hope you would find your way to work out your own modified model.
Hope it helps.
Best wishes
Xuhua
Dear Mohannad,
Welcome,
The dark current shows that you you have a zero at 0.6V which means that your cell is not measured in darkness. It is measured with the weak light incident on the solar cell. The cell is not completely darkened.
This is one point.
The other point is that the illuminated characteristics is very far from prdinary functioning solar cells. The structure has high series resistance and high shunt resistant. It seems that the shortcircuit current is very low. This is due to built in electric field and high recombination rate. So, you must improve your process.
I would like that you see the paper in the link: Conference Paper Generic Analytical Models for Organic and Perovskite Solar Cells
Best wishes
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